How To Identify a Good Air Conditioning Engineer

There are an abundance of air conditioning engineers on the market today. With so much choice as a customer, it can be hard to know where your money is best spent. Here at Chillaire, we have been in the industry for years and, we believe, have seen it all. That being said, we believe we know how to identify a good air conditioning engineer. Today we are going to outline the telltale signs of a reputable air con engineer. This way, the next time your air conditioning unit needs repairing and you call a specialist, you will know when you are getting the very best value for money.

Air Conditioning Engineer: What Do They Do?

Before we delve into what a good air con engineer looks like, let us first briefly look at what an air conditioning engineer does. Essentially, an air conditioning specialist is responsible for maintaining, repairing and providing an insight into your air conditioning unit. If you have any problems or questions regarding your air conditioner, a high quality air con engineer should fix the issue or answer these questions. They will be able to lean on experience with a number of customers and product brands to provide a solution. So, what does a good air conditioning engineer look like? Continue on!

How To Identify a Good Air Conditioning Engineer

A lot of the time, spotting an air conditioning specialist who represents good value for money is a matter of common sense. There are, however, a few things that all air con engineers from reputable companies will have. These include:

Appropriate Qualifications

Like any industry, there are certain standards air con engineers must meet. When you are searching for someone to take a look at your air conditioner, you may wish to enquire about their qualifications. They should, for
example, hold an F-gas qualification which enables them to legally work install, service, repair and leak test air conditioners. Because of the environmental threat posed by the refrigerant in air conditioning units, reputable
companies must ensure their engineers hold this qualification. Moreover, some engineers may hold health and safety accreditation. If an engineer is highly qualified, it shows conscientiousness, professionalism and a
willingness to do the job properly.

Good Reviews

This one may seem obvious, but the sign of a worthwhile engineer is positive reviews. In addition to this, transparency about previous work/ experience. If you do a search for ‘’air conditioning engineers near me’’, look for companies or tradespeople that have good and thorough reviews. These will indicate both the quality of the engineer as well as their work, and will help to divide any tradespeople that do not offer good value for money.


A company or engineer that has been in business for a number of years is, arguably, going to offer better value for money. They will have experience dealing with a larger variety of issues, and will be able to access past
experience to get the job done effectively and efficiently. The problem with relatively new companies is that they themselves may still be learning the ropes. Transparency about previous experience is also something to look for. If your engineer is vague about any experience, this may indicate a problem.

Qualified Air Conditioning Engineers With Chillaire

The team at Chillaire hope you are now on your way to identifying a good quality engineer for your next air conditioning repair project. It is important that your engineer is both qualified and experienced, such as our engineers. Our air con specialists hold CSCS Skillcards, have SSSTS (site supervisor safety training scheme) certification, UKATA Asbestos Awareness, IPAF, PASMA, First Aid & Amp and are Fire Risk Assessment certified. Our Senior staff also have the following: IOSH & HNC certified

In addition to this, our team has years of experience they can lean on which helps them get the job done quickly and to the highest professional standard. For more information on our services or to request a quote, contact us today!


Engineer fixing an air conditioner












Air conditioners are now widely manufactured, distributed and used, but how do air conditioners work? How air conditioning works is often insufficiently explained. For people trying to diagnose problems with their air conditioning system or explain faults to an engineer, it can be challenging. Although they come in a variety of types, shapes, forms and sizes, most air conditioners have the same foundation. Today we are going to provide some more information on the inner workings of air conditioners: answering ‘’how do air conditioners work?’’. 

How Do Air Conditioners Work: An Overview 

Here at Chillaire, our engineers are always asked the same question: ‘’how do air conditioners work?’’. We use air conditioners constantly, in a variety of settings. Whether you belong to the domestic sector or you work in the commercial or industrial sector, you will, undoubtedly, have used or come across an air conditioner at some point. We often use appliances blindly without much knowledge of their inner workings, or how they provide the end result. Whilst, for the most part, this is fine, it is helpful to have some insider knowledge when an appliance breaks down and you are trying to diagnose or fix the problem. 

The premise of how air conditioning works is simple: cold air is supplied to a room or indoor space by removing heat/ humidity from air within the space. The mechanics inside your air conditioner work to provide a cool environment by capturing unwanted heat and pushing it outside. The air is, essentially, recycled. Continue below where we outline, in greater detail, some air conditioning basics. 

The Air Conditioning Basics 

Now we have an understanding of the purpose of an air conditioner, let us delve a bit deeper into some air conditioning basics. There are two components that make an air conditioner work. You have a specialised gas called a refrigerant, and then you have the mechanical system which is made up of a compressor, a condenser coil, expansion device and an evaporator coil. All of these elements work harmoniously in the background to provide your indoor room or space with cool air. 

Going further, these components all work to convert the refrigerant from gas to liquid and back again. The role of the compressor is to alter the pressure and temperature of the refrigerant. This is then sent to the condenser coil where it is converted to liquid. The gas refrigerant enters the evaporator coil where it, you guessed it, evaporates with the aid of the expansion device. This causes a state change and heat from the room air passing through the evaporator cools the indoor coil in the process. As the fan blows indoor air across this cold coil, heat inside the room or space is absorbed by the refrigerant. Cool air now circulates throughout a space whilst the heated gas returns to the compressor. The excess heat is dispelled outside as the refrigerant returns to its former liquid state. This cycle continues quickly and continuously until the right temperature is reached. 

So for anyone wondering ‘’Do air conditioners take in air from outside?’’, the answer is no. This is not how your air conditioning system is designed. Rather, your system uses its fans to draw in air and disperse it through its inner structure. In essence, it is recycled air that passes through coils which cool it down before redistributing it. However, systems can be designed that bring in fresh air if required. 

Air Conditioning Basics: Benefits of Air Conditioning 

It is important that we have functioning and well maintained air conditioners. A common air conditioning system has a variety of benefits to homeowners and business owners alike. For example, air conditioners help to improve indoor air quality. Some air conditioning systems have dust filters which help to capture dust and pollutants chiefly to ensure the smooth running of the internal mechanics. But these have a positive effect on air quality. Some modern air conditioners even have air purification systems built in. 

Moreover, air conditioners remove moisture and warmth from indoor air which helps to tackle excessive humidity. This is important for helping to combat damp, as well as tackling a number of health problems we are susceptible to in humid environments. 

Lastly, an air conditioner simply creates a more comfortable environment and atmosphere. In the summer or in countries that have a significantly warmer climate, air conditioning becomes extremely valuable. Office or factory workers are also able to carry out their tasks in a comfortable environment thanks to the availability of modern air conditioners. 

How Air Conditioning Works by Chillaire 

We hope any one who arrived at this article asking ‘’how do air conditioners work?’’ now has a better idea of how these systems operate. With a little more knowledge about the individual components, the task of identifying and diagnosing issues is made that bit easier. 

If you are having problems with your air conditioner and are based in the Midlands, we at Chillaire can help. For any client in the industrial or commercial sector, we can maintain, service and repair air conditioners or heat pumps. With years of experience and an expert team who have completed countless jobs, no task is too big, small or complex for us. To contact us today to find out how we can help you, click here

Sanyo Heat Pump & VRF & Chiller Spares

We are still able to continue to source spare parts for existing Sanyo heat pump air conditioning systems and chillers or offer replacement systems. This can be done by matching existing Sanyo split Air Conditioning Systems, Heat Pump Systems, VRF Systems or Chiller Units with new Panasonic alternatives from their wide range of products.

Panasonic merged the Sanyo brand during 2012 into the Panasonic brand, with the product ranges of both brands combing under the Panasonic logo. The Sanyo name ceased to be an active brand, at least in heat pump / air conditioning / VRF & chillers.

This meant that in the UK, virtually all of the Sanyo RAC products and Sanyo residential air to water range were replaced by Panasonic equivalent ranges.

Panasonic commenced the replacement of the Sanyo commercial products, launching with the ECOi electric VRF systems, which replaced the previous Urban Multi UM4 range in its entirety and running alongside Panasonics own FS-Multi simplified VRF range. A new Panasonic range branded Elite PACi and GHP was brought in, with Elite PACi being run in parallel with Panasonics own FS range.
Over a period of 2 years (by 2014) the existing Panasonic FS and FS-Multi ranges had been discontinued in the UK and the entire Panasonic commercial air conditioning and heating ranges are now based upon what was Sanyo’s PACi, ECOi and ECOG products.

Supporting old Sanyo versions of products with new Panasonic is relatively easy because the electronics are virtually identical.

Older Sanyo product spares can still be sourced with technical support and connecting additional controls or indoor units, even replacing indoor or outdoor units is possible.
Chillaire Limited have done this on many occasions for many customers. We have attended customer sites to assist with modifications or repair of old Sanyo systems without issue. We can attend site and investigate any existing Sanyo system and provide equivalent Panasonic solutions.
We also have access to Sanyo technical support through Panasonic UK. We are able recognise Sanyo model references and match them with the latest Panasonic replacement parts or replacement Panasonic system, so as far as Chillaire Limited are concerned it is business as normal. Chillaire Limited, as a Panasonic distributor, feel it is important we are able to offer the Sanyo parts replacement service with its long association with the brand.

We continue to offer a wide range of spare parts for all the heat pumps and air conditioners supplied by Sanyo into the UK market. These include the Scroll Compressor, Inverter Compressor, Swing Compressor, Sanyo PCB’s (Printed Circuit Boards), Air Filters, Fan Motors, Thermistors, Drain Pumps, Remote Controls, Expansion Valve, Condenser Coil, Solenoid Valve, Crankcase Heater, Electronic Thermostat, Float Switch, Magnetic Contactor, Capacitor, High Pressure Switch and Sensors.

We also offer a free site survey and quotation for any existing Sanyo heat pump air conditioning / VRF or chiller system replacement required. If you need a replacement now or are planning to replace your Sanyo product / system in the future, call us today for a free consultation discussion or to arrange a free survey and quotation.

Daikin D1 business partner logo

Daikin has introduced a new Rebel Applied rooftop HVAC system which meets the demanding in-airflow design standards set by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE).


Daikin’s Rebel Applied team introduced its first high-IEER (Integrated Energy Efficiency Ratio) units to the HVAC rooftop market in 2012. The new range introduces next-generation technology.

A configurable rooftop HVAC system

The small, light and customisable units includes a high-efficiency motor and compressor, making them a good choice for retrofit projects. They are designed to provide comfortable conditions, excellent indoor air quality (IAQ), and energy savings.

The availability of configurable energy-efficient rooftop HVAC systems has been limited, so the launch of this new range with an air-leakage rating at +/-6 inches or 0.5% at design airflow is welcome news.

Performance by design

Carefully defined testing procedures confirm that the unit casing is built to effectively minimise energy use and to meet high performance standards. The units are also designed to eliminate direct conduction paths which reduce energy efficiency.

The Rebel Applied units also have a compact footprint and the base channel can adapt to several different types of curb that connect the rooftop units (RTUs) to ductwork and electrical systems. This removes the need for a transition curb which would add extra time and cost during installation.

Comfort and control at your fingertips

Building managers can set temperatures using the high-efficiency direct expansion refrigeration technology that includes heating and IAQ controls. Efficiency and filtration settings can be tailored to specific needs, from offices and hospitals to schools and retail environments.

When connected to the Daikin Intelligent Equipment® remote monitoring, ventilation, pressurisation, space temperature and humidity can all be adjusted.

UK-wide air conditioning design and installation service

If you need to retrofit rooftop air conditioning, please call us for a free no obligation site survey and quotation to design and install your solution.


Chillaire Limited is D1 Partner with Daikin Air Conditioning UK

Visit our website or email us at

Chillaire Limited has local offices around the country:


Nuneaton & Warwickshire Office: Unit 1 Veasey Close, Attleborough Fields Industrial Estate, Nuneaton, CV11 6RT. Telephone: 024 7632 0300

Coventry & West Midlands Office: 16 Lythalls Lane, Holbrooks, Coventry, West Midlands, CV6 6FG. Telephone: 024 7624 9440

Leicester & Leicestershire Office: 3rdFloor, St George’s House, 6 St George’s Way, Leicester, Leicestershire, LE1 1QZ. Telephone: 0116 202 5094

Redditch/Alcester & Worcestershire Office: Minerva Mill Innovation Centre, Station Road, Alcester, Warwickshire, B49 5EH. Telephone: 01527 531275

Northampton & Northamptonshire Office: Moulton Park Business Centre, Redhouse Road, Moulton Park, Northamptonshire, NN3 6AQ. Telephone: 01604 269540

Kettering & Corby Office: 10A Silver Street, Kettering, Northants, NN16 0BN. Telephone: 01536 38604

Mitsubishi Ceiling Air Conditioner System

Installation Case Study

A Mitsubishi Heavy Industry heat pump ceiling air conditioner system was the ideal solution for our recent installation at the Coventry-based car dealership showroom.

The Green 4 Motor Company dealership provides new and used cars sales and servicing. They are recognised for their in-depth product knowledge and willingness to help whenever they can.

That’s why we have enjoyed working with them so much for the last 10 years, looking after their existing air conditioning.

Like us, they’re committed to quality and service, so when it was time to replace their air conditioning, we didn’t hesitate to recommend a Mitsubishi Heavy Industry solution.

Take a Look at the Mitsubishi Ceiling Air Conditioner System we Installed at Mazda, Coventry

Ceiling air conditioning in car showroom
Ceiling air conditioning units in a car showroom

A Comfortable Showroom Environment is Essential

Temperature control can be challenging in showrooms that have high ceilings, a lot of large windows and often a mezzanine floor as well. However, maintaining a comfortable ambient temperature throughout the showroom, offices and staff areas is essential for productivity and sales.

It’s difficult to concentrate if the temperature is too high or too low. When customers visit a showroom, a fresh and comfortable environment will make them want to stay and improve the chances of a sale.

Carefully designed ceiling air conditioner units with well-calibrated controllers will help to manage the challenges of convection in larger open spaces and they won’t spoil the design of the showroom either.

Mitsubishi Ceiling AC Unit

Temperature control can be challenging in showrooms that have high ceilings, a lot of large windows and often a mezzanine floor as well. However, maintaining a comfortable ambient temperature throughout the showroom, offices and staff areas is essential for productivity and sales.

It’s difficult to concentrate if the temperature is too high or too low. When customers visit a showroom, a fresh and comfortable environment will make them want to stay and improve the chances of a sale.

Carefully designed ceiling air conditioner units with well-calibrated controllers will help to manage the challenges of convection in larger open spaces and they won’t spoil the design of the showroom either.

Ceiling Air Conditioning from Mitsubishi

The Mitsubishi Electric ceiling air conditioning cassette system (PLA-SM) we installed features inverter technology and uses R32 refrigerant, making it a good all-round choice in terms of impact on the environment, energy efficiency, safety and cost-effectiveness.

They are an excellent air conditioning solution for larger business premises such as showrooms and, since they can be installed with a pipe run of up to 40 metres to the outdoor units, they are flexible too.

Car showroom ceiling air conditioning

Air Conditioning Inverter Technology

Inverters provide good performance for both heating and cooling. They control the voltage, current and frequency of elements such as the compressor motor in the air conditioning unit.

Information from sensors monitoring the environment will adjust the revolution speed of the compressor to regulate output, reducing electricity consumption and maintaining comfortable ambient conditions.

By controlling operation frequency, the start-up output is more powerful, creating a comfortable temperature quickly. Once right temperature is reached, it will be monitored and the most efficient waveform calculated to keep the space in the comfort zone without large temperature changes.

A Local Business

Chillaire is a local business with our head offices in Nuneaton. We have working in the Coventry area for almost 30 years, including areas around Leamington Spa, Rugby and Hinckley.

As well as installing air conditioning and heat pumps, we also design and install commercial chillers and industrial heating and ventilation systems.
Please get in touch if you would like to find out more.

Local West Midlands Office: Patani House, 16 Lythalls Lane, Coventry CV6 6FG Coventry office telephone number: 024 7624 9440

Warwickshire Office: Unit 1 Veasey Close, Attleborough Fields Industrial Estate, Nuneaton, Warwickshire, CV11 6RT
Nuneaton office telephone number: 024 7632 0300

Leicestershire Office: 3rdFloor, St George’s House, 6 St George’s Way, Leicester, Leicestershire, LE1 1QZ
Leicester office telephone number: 0116 202 5094

At Chillaire we often recommend Daikin heat pump air conditioning units. Daikin is a leading manufacturer of high quality, reliable heat pumps and air conditioning products.

Using the latest technology, they offer excellent environmental temperature control and efficiency. Through research and development, Daikin air conditioning systems have been developed for a wide range of applications.

A Daikin heat pump air conditioning solution for the Nuffield Health gym in Cannock

That’s why we designed and installed a Daikin air conditioning solution for the Nuffield Health gym at Cannock in Staffordshire; one of the many Nuffield Health Centres we work with across the UK.

The Daikin VAM 2000 heat recovery ventilation unit provides an energy-efficient fresh air system using a heat recovery and exchanger chamber which can recover around 75% of the room heat.

The ceiling cassette 4-way fan coil unit and 360° round flow cassette fan coil unit met the demanding criteria to deliver a comfortable environment for the new spin exercise room.


Daikin indoor heat pump air conditioning unit FCAG71A

Indoor model reference FCAG71A

Daikin outdoor heat pump air conditioning units RZASG71MV1

Outdoor model reference RZASG71MV1

Why air conditioning is important in gyms

When developing or refurbishing your gym, air conditioning and temperature control need to be an important part of your plans.

Cooler temperatures help your clients optimise their training with less fatigue. Intensive workouts in spinning classes, for example, can lead to dehydration and heat exhaustion if the environment becomes too hot.

If the temperature is too high during an exercise session efficiency decreases as your body attempts to cool itself. By maintaining a consistent, comfortable temperature that can be properly controlled in relevant zones, you can enhance the exercise environment and help your members to improve their results.

Air conditioning can also help to regulate humidity by condensing hot, moist air and removing it from the building.

You even have the option of running your air conditioning in ‘dry mode’ to reduce humidity, without overcooling the environment.

Many air conditioning systems include air filtration that can remove dust particles, pollen, and bacteria to create a fresher, healthier environment.

Choosing the right air conditioning solution

The key is to choose a solution that is the right size for the space and the workload it must deliver.

A cost-effective way to add air conditioning is to install an energy-efficient heat pump, especially in older, unrenovated buildings. This will transfer thermal energy from warm areas to cool ones in the winter and can be reversed in summer.

Systems that provide both air conditioning and heating and can be more efficient than older electric heaters or boilers, so you can save money as well as improving the environment for your members.

More information

We will be happy to give you more details about the heat pump inverter driven cassette split-type systems with the latest R32 refrigerant we installed at the Nuffield Health gym in Cannock.

In addition to specialist air conditioning solutions for gyms, we also have solutions for data centres or computer rooms.

To discuss your requirements, please contact us on our local umber: 01455 265143 or email us at

We cover the whole of the Leicestershire area including Leicester, Hinckley, Ibstock, Earl Shilton, Broughton Astley, Oadby, Blaby, Narborough, Loughborough, Shepshed, Coalville, Lutterworth, Magna Park, Market Harborough, Syston, Melton Mowbray and the rest of Leicestershire.

Local Warwickshire Office:

Unit 1 Veasey Close, Attleborough Fields Industrial Estate, Nuneaton, Warwickshire, CV11 6RT

Nuneaton Office: Telephone Number: 024 7632 0300 / Email:

Leicestershire Area Office: 3rdFloor, St George’s House, 6 St George’s Way, Leicester, Leicestershire, LE1 1QZ

Leicester Office Telephone Number: 0116 202 5094 / Email

We also cover the adjacent counties of Nottinghamshire, Warwickshire and Northamptonshire.

You can call us on our Freephone number: 0800 092 9898

Green Buildings

Environmentally Friendly and Shown to Improve Business Performance

Green buildings are not only environmentally friendly; there’s growing evidence that they can also improve overall business performance.
We all understand that modern heating, ventilation and cooling systems are efficient and can save us money. However, green buildings can reduce absenteeism and improve morale.

Some forward-looking employers are also using their high-quality working environment as another way to attract and retain the best talent.
Understanding the benefits of green buildings

Plants and waterfall inside a glass building

Understanding the benefits of green buildings

Around half of owners don’t know the financial impact of their green buildings.

  • These can include:
  • Quicker lease periods.
  • Premium rents.
  • Higher building values.

While good feedback and a lack of complaints can indicate the positive impact of green buildings, more structured information will help to make the case.

Almost two-thirds (62%) of owners are now looking to employee satisfaction and engagement surveys to improve their understanding of the benefits of green, sustainable healthy workplaces.

Expert view on green buildings

Industry experts have highlighted that enhanced air quality and comfortable temperatures are at the top list when it comes to a healthy workplace.

For many years research has been available that shows how specific building strategies that include improved natural daylight and air quality can enhance learning and attentiveness in education, recovery rates in healthcare buildings and productivity in general office settings.

A graphic showing seven health building priorities

The top benefits expected by public health professionals are improved emotional and social wellbeing. Their aim is to make building owners, architects, construction companies and facilities managers more aware of the importance of health buildings. While all of these groups already consider the health and wellbeing of building occupants, it isn’t their top priority and is often outweighed by design and construction costs.

For a glance into the future of green buildings, see what Nick Lee of the Commercial Estate Group (CEG) has to say.

If you are interested in enhancing the health of your building with better air quality and temperature control, we’d be happy to give you some advice. Please get in touch.

For other areas please see our local addresses below:

North UK & Leicestershire Office: 3rd Floor, St George’s House, 6 St George’s Way, Leicester LE1 1QZ Tel: 0116 202 5094 or email

North Warwickshire Office: Unit 1 Veasey Close, Attleborough Fields Industrial Estate, Nuneaton, Warwickshire CV11 6RT Tel: 024 7632 0300 or email:

Northamptonshire Office: Moulton Park Business Centre, Redhouse Road, Moulton Park, Northampton, Northamptonshire NN3 6AQ Tel: 01604 269540 or email:

Redditch / Alcester Office & West UK Office: Minerva Mill Innovation Centre, Station Road, Alcester, Warwickshire B49 5EH Tel: 01789 273289 or email

Kettering & East UK Office: 10A Silver Street, Kettering, Northamptonshire NN16 0BN Tel: 01536 384046 or email

You can call us on our Freephone number: 0800 092 9898

Nuaire XBOXER Hybrid

After some interesting design challenges, the mechanical ventilation experts, Nuaire, have now launched their new XBOXER Hybrid range. They provide a natural system with fans for mixing warm air when it’s cold and for higher flow rates in hotter weather.

Mixed­-mode or hybrid ventilation is a popular solution for schools. It introduces air both naturally and mechanically for better airflow.

Developing the Nuaire Hybrid unit

Before development began, Nuaire carried out survey to find out more about their customer’s hybrid ventilation requirements. Based on the feedback they received, design started back in January 2017. A typical approach was used with supply, extract, intake and exhaust working as two pathways inside the unit. It had side-access controls and an internal damper to recirculate warm classroom air and to manage air from outside to reduce draughts.

Initial testing showed that performance was affected because the controls were in the air path. Moving the controls so they could be accessed from the bottom improved performance and made installation into classrooms easier.

Originally, built-in mounting brackets were used, but this was changed to a separate mounting bracket. A simple two-stage installation was now possible, with reduced external fixings and rivets. Since the bracket was hidden at the top of the unit after installation, the units also blended more easily into a classroom environment.

Unexpected Test Results

Nuaire used a leading Air Movement and Control Association (AMCA) accredited test laboratory to evaluate their new design. The XBOXER Hybrid was treated as a mechanical unit for testing and the results weren’t as expected.

With the damper fully open, the unit acted as a natural ventilation unit as anticipated. The pressure difference across the fan drew fresh air in from outside and CO2-laden air was displaced to leave through the exhaust path.

However, in recirculation mode, even with the damper opened slightly, the intake side of the fan began to draw air in from both the intake and exhaust paths, so air couldn’t leave.

This meant that the recirculation path needed to be separated from the discharge path, so in late 2018 the team started a new design.

Revised unit design

In the revised Nuaire design the recirculation path is separated from the exhaust path when the unit is in recirculation mode. Testing of the new XBOXER Hybrid approach confirmed that excessive negative pressure was avoided by isolating the exhaust and supply paths, and the final design was agreed.

Nuaire HVAC Product launch

Nuaire has now launched three new units in the XBOXER Hybrid range

Two singlue use units for use in master/secondary configuration and a double unit

  • XB-H130M (Single Unit)
  • XB-H130S (Single Unit)
  • XB-H260 (Double Unit)

These units will be available with building management system (BMS) integration controls including room air quality sensors with a traffic light display and a simple control switch which is designed to be student tamper-proof.

Contact Us to Enquire About the New Hybrid Xboxer

For more information about hybrid ventilation systems, please contact us at 16 Lythalls Lane, Holbrooks, Coventry, CV6 6FG   Telephone: 024 7624 9440 or email

For other areas please see our local addresses below:

North UK & Leicestershire Office: 3rd Floor, St George’s House, 6 St George’s Way, Leicester   LE1 1QZ Tel: 0116 202 5094 or email

North Warwickshire Office: Unit 1 Veasey Close, Attleborough Fields Industrial Estate, Nuneaton, Warwickshire   CV11 6RT Tel: 024 7632 0300 or email:

Northamptonshire Office: Moulton Park Business Centre, Redhouse Road, Moulton Park, Northampton, Northamptonshire   NN3 6AQ Tel: 01604 269540 or email:

Purchase price is just one consideration when choosing your air-conditioning system.

air-conditioning pipework must have the correct wall thickness

Reliability and running costs aren’t simply a function of the brand you choose, there are other factors too.

We asked a selection of consultants to give their views on how to extend the life of air-conditioning systems.

Product design and quality

The best air conditioning systems are those where the manufacturer produces most of the main components, such as compressors and heat exchangers. Most major brands invest huge amounts of money into research, design and testing. However, buying the most expensive brand is not always a guarantee of durability.

Look out for ISO (ISO 14001) accreditation to ensure the highest quality build standards. To be sure that the product meets safety standards, look for compliance with relevant CE Directives. For confidence that your choice will stand the test of time, also look for Eurovent certification.


If your air-conditioning system is too small for its location it is more likely to fail. It will have to work longer and harder to deliver your desired temperatures, reducing the life expectancy of the compressors and leading to more frequent defrost cycles in heating mode, affecting operation and reliability.

Location is important too. Airflow and the length of pipe runs will affect performance. also help to reduce the load and improve reliability and performance.


Pipes – Be sure the correct copper pipe is used for your system and that the wall thickness is suitable for the operating pressures of your system. A pipe with a larger diameter will need a thinner wall, but you should also be aware that, when you bend a pipe, the wall thickness is reduced.

Pipes should be capped or sealed during the storage and installation to reduce the risk of moisture or debris getting into the system. Moisture will cause the oil to become acidic, damaging compressor windings and breaking down seals, eventually causing leaks. Foreign materials will block strainers and valves and can even cause the compressor to fail.

Purging – Joints should be brazed when the pipework is being purged with oxygen free nitrogen (OFN). If OFN isn’t used, internal oxidisation will occur and collect in strainers and dryers when the system is operating.

Pipe support – Movement during operation can cause weakening and possible refrigerant leaks. Since refrigerant can burn, anybody nearby could be seriously injured by a leak and, because it’s heavier than oxygen, it could cause asphyxiation in certain conditions.

Pressure testing – Pipes must withstand the maximum operating pressure of the system and should always be tested for strength and leaks. F Gas regulations specify the pressure and duration of these tests. The area should always be evacuated during strength testing, as a failure under pressure can cause serious injury.

Insulation – The higher the operational humidity, the greater the insulation wall thickness should be. Joints should always be glued or taped together as insulation can contract over time. Exposed pipes will reduce efficiency and increase demand on the compressor.

Wiring – The power supply must always comply with current regulations.
When residual current devices (RCDs) and residual current breakers with overload protection (RCBOs) are being used circuits must be able to accommodate load from other electrical equipment without causing nuisance tripping.

Air-conditioners can generate a small amount of earth leakage, so interconnecting cables should be seamless where possible and should ideally run with the pipework. Loose or broken connections can be very difficult to find.

Coiled and bundled cables and cables crossing or running near other cables can cause noise on the air-conditioning communication line, resulting in system faults or failures.

Condensate – Always use the manufacture’s maximum lift specification on pumps as condensate flooding back can damage the unit, leading to costly repairs. Pumps can fail, so certain applications might require a high-level alarm or cut-off to prevent costly water damage.


Vacuum – Evacuation is time-consuming but important because it’s the only way to confirm that there isn’t any moisture in the pipework. Your commissioning engineer should have a calibrated Torr gauge, a well-maintained vacuum pump, and a clean and well-maintained manifold set. A rising Torr gauge is an indication of moisture in the system.

Refrigerant charging – Manufacturers will specify additional charge details. Some systems don’t need additional refrigerant while others require a precise additional charge depending on the length and diameter of installed pipework.

To avoid contamination the refrigerant should always be new. The refrigerant should be carefully weighed because overcharging a system, or allowing liquid refrigerant should not return to the compressor, can cause mechanical failure.

The quantity of refrigerant in a system depends on the frequency of leak checks. A shortage of refrigerant will increase the demand on the system, the operating temperature of the compressor, and the frequency (speed) controls to the inverter compressor. As the temperature of these components increases, so does the chance of failure.


Well-maintained air-conditioners are efficient and reliable. Regular maintenance is also essential to maintain manufacturer’s warranty, so a maintenance contract is a good idea.

Simple things like cleaning filters and ensuring that airflow isn’t restricted will help to maintain system reliability and performance. F-Gas regulations also require that the system is regularly checked for leaks.

Controls and monitoring

Simple controls will extend the life of your air-conditioning system. Timers and temperature controls can help to minimise use at night, for example.

Airflow adjustment via fan speed and louvre settings will evenly distribute the conditioned air and prevent your system from continually running, without ever achieving a set point.

Controller position is also important. Many controllers have return air sensors, so making sure they are installed away from direct heat sources, drafts and air discharged from the system will increase the efficiency and reduce running time and compressor frequency.

Manufacturer’s support

From time to time components will fail, so it’s important to have confidence that your supplier has a full technical back-up service, a helpline and a readily available stock of spares. Qualified and experienced engineers can then quickly and accurately assess and diagnose your problem and find a solution

If your air-conditioning system is business-critical, consider holding a stock of the manufacturer’s ‘recommended spares’.

User’s support

Your users can also help to keep the system running efficiently by only using it when it’s needed. Simply keeping doors and windows closed will mean the system doesn’t have to compensate for unexpected heat gains or losses. Make sure everyone understands that adjusting controller temperatures when the system is first switched on won’t speed up the process and will only increase use of the compressor.

Air-conditioning efficiency tips

Addressing – Indoor and outdoor units are controlled through addressing. If it is done incorrectly, the worong indoor and outdoor units could be talking to each other, resulting in excessive run times and operating conditions.

Test runs – Most systems require power to the condenser before operation so that the crankcase heater can remove liquid refrigerant from the compressor sump by boiling it off. This will prevent compressor failure due to pumping liquid refrigerant.

Monitoring – Temperatures and pressures are continually monitored to confirm that the system is operating correctly and efficiently. Many systems allow the readings for be monitored from a PC so that, for instance, an unplugged valve box or a non-rotating fan can be easily spotted and addressed, avoiding the risk of costly repairs in the future.

For more information please contact us at 16 Lythalls Lane, Holbrooks, Coventry, CV6 6FG  Telephone: 024 7624 9440 or email

For other areas please see our local addresses below:

North UK & Leicestershire Office: 3rd Floor, St George’s House, 6 St George’s Way, Leicester  LE1 1QZ   Tel: 0116 202 5094 or email

North Warwickshire Office: Unit 1 Veasey Close, Attleborough Fields Industrial Estate, Nuneaton, Warwickshire  CV11 6RT   Tel: 024 7632 0300 or email:

Northamptonshire Office: Moulton Park Business Centre,  Redhouse Road, Moulton Park, Northampton, Northamptonshire  NN3 6AQ   Tel: 01604 269540 or email:

Redditch / Alcester Office & West UK Office: Minerva Mill Innovation Centre, Station Road, Alcester, Warwickshire  B49 5EH  Tel: 01789 273289 or email

Kettering & East UK Office: 10A Silver Street, Kettering, Northamptonshire  NN16 0BN   Tel: 01536 384046 or email

You can call us on our Freephone number: 0800 092 9898

Visit our website for further details:

Learn Why CO2 Refrigeration is a Viable Option for Commercial and Industrial Cooling.

Before explaining to you why CO2 refrigeration is a viable option for cooling, it makes sense to delve into some background.


Hydrofluorocarbon (HFC)

Hydrofluorocarbon (HFC) refrigerants were part of the solution when chlorofluorocarbons (CFCs), were phased out. CFCs had been used since the 1930s for air-conditioning, refrigeration, and many other applications.
However, their impact on the world’s ozone layer was recognised in the 1970s. In 1990, the Montreal Protocol was strengthened, and CFCs were effectively banned by 2010.

Almost three decades on, HFCs are now known to have global warming potential (GWP) and are also due to be phased out. Under the Kigali Amendment to the Montreal Protocol, these refrigerants won’t be used for applications such as air-conditioning and refrigeration after 1 January 2024.

Two other hydrochlorofluorocarbons (HCFC) refrigerants, (chlorodifluoromethane or R-22 and trifluoroethane or R-123), also widely used in commercial applications, will no longer be used after 2020. R-123 won’t be used for new cooling equipment after 1 January 2020, although it will still be produced for servicing equipment until 2030. R-22 is no longer used for new equipment and new R-22 won’t be produced or imported after 2020.

Carbon Dioxide Refrigerant as a Viable Alternative Refrigerant

Using alternatives like the below can help to future-proof your refrigeration equipment.

  • Ammonia (R717 refrigerant)
  • Propane (R290 refrigerant)
  • CO2 (R744 refrigerant) 

CO2 refrigeration has been used since the mid-nineteenth century. It was replaced with man-made refrigerants including CFCs and HFCs during the twentieth century.

There have been concerns that it is dangerous to use CO2 as a refrigerant. However, there are risks with all refrigerants if they are used in the wrong conditions. In a properly designed installation, CO2 refrigeration can be as safe as other refrigerants.

Since CO2 is colourless and odourless leak detection is an important consideration. However, other refrigerants also need to be carefully managed and monitored.

As other common refrigerants are phased out, the comparative cost of installing and running CO2 refrigeration systems now makes them a viable choice.

Characteristics and Benefits of CO2

While using natural refrigerants can be limited because of their toxicity and flammability, CO2 is neither in normal refrigeration applications and is a viable option when these issues are a concern.

CO2 doesn’t deplete the ozone and is recognised as being environmentally friendly, with a Global Warming Potential (GWP) of 1.

CO2 systems can be more efficient than many current systems in most climate conditions, so indirect emissions of green-house gasses (GHGs) from additional energy consumption can also be reduced.

Higher compression is needed for CO2 systems compared with other systems, but this can lead to smaller pipework sizes and reduced suction valve costs. Compressors can be up to six times smaller than more traditional applications and higher suction pressure improves efficiency.

Thanks to the high heat transfer characteristics of CO2, evaporators can operate at higher temperatures. With a smaller difference between temperature of the refrigerant and the air temperature also means that efficiency is improved and capacity in the heat exchangers can be increased.

CO2 is inert and stable, so chemical reactions with polymers aren’t a concern. Since it isn’t corrosive in most cases, it can be used with the same materials as HFC systems. Because it’s stable, decomposition within the refrigeration system is reduced, so Carbon Dioxide refrigeration systems have longer lifespans than HFC systems, for example.

CO2 is already being used more widely for industrial refrigeration as the low-stage refrigerant in cascade installations or as a secondary coolant. With the latest design and technology developments it is also becoming viable for commercial applications.

Contact Us for a Free Quote on Carbon Dioxide Refrigeration Systems

Contact us and we will be happy to give you advice on your industrial or commercial installations.

Coventry & Warwickshire Office: Chillaire Limited, 16 Lythalls Lane, Holbrooks, Coventry  CV6 6FG Telephone: 024 7624 9440 or eEmail:

Leicestershire Office: Chillaire Limited, 3rd Floor, St George’s House, 6 St George’s Way, Leicester, LE1 1QZ  Telephone: 0116 202 5094 or email:

Northamptonshire Office: Chillaire Limited, Moulton Business Centre, Redhouse Road, Moulton Park, Northampton, NN3 6AQ   Telephone: 01604 269540 or email:

Air Conditioning - Heating - Ventilation