Here’s something most people don’t know: a blocked filter is behind a surprising number of air con problems. The unit running but not cooling properly. Energy bills going up without an obvious reason. That musty smell when it first kicks on after a few months off. None of that usually needs an engineer. It needs a filter clean, and knowing how to clean air con filters properly takes about fifteen minutes.

What the Filter Actually Does

Air gets pulled through the filter before the unit circulates it. Everything floating around the room, dust, pet hair, pollen, general household debris, gets caught in the mesh. That’s the point of it. The problem is that over time the build-up restricts airflow, and a unit pushing air through a blocked filter has to work harder to do the same job. Harder work means more energy, more wear, and eventually something giving up earlier than it should.

The air quality side of it is worth mentioning too. A filter that’s full isn’t cleaning the air properly anymore. For anyone with allergies, that matters. For everyone else it just means the room smells slightly off and you can’t work out why. This is exactly why understanding how to clean air con filters is worth a few minutes of your time.

How Often

Every two to four weeks during heavy use is the standard advice. If the unit runs every day through summer, check it monthly. Rooms with pets or higher dust levels need it more frequently.

Honestly though, you don’t need a schedule. Just pull the filter out every so often and look at it. Grey and coated means clean it. Still looks reasonable means put it back. Knowing how to clean air con filters takes five minutes to learn. Remembering to actually do it is the harder part.

How to Clean Air Con Filters: The Actual Process

Off first: Turn the unit off before doing anything: Not just the remote, the unit itself.

Front panel open: On most wall-mounted split units the front panel lifts upward or unclips at the bottom. If it’s not obvious, the manual will show you. The filters sit just behind it, usually two thin mesh panels that slide or clip out without any tools needed.

Take them out carefully: They’re light and they shed dust easily. If you’re inside, have a bag ready or carry them straight outside before the dust gets a chance to go everywhere.

Vacuum first: Soft brush attachment, gentle strokes across the surface. Takes the bulk off without spreading it around. Don’t press hard into the mesh.

Rinse under a tap: Lukewarm water, gentle flow, no scrubbing. Most filters handle this without any issues at all. Hot water can warp the mesh. Strong cleaning products leave residue that ends up getting blown into the room. Warm water is enough.

Dry them properly: This is where people cause problems. A filter going back into the unit while still damp creates conditions for mould and can damage internal parts. Lay them flat somewhere with a bit of airflow. Give it at least an hour. Don’t try to speed it up with a hairdryer on a high heat setting.

Back in, switch on: Refit the filters, close the panel, turn the unit on. If they were badly blocked the difference in how it runs is usually noticeable immediately.

Common Mistakes

What people try the most is cleaning the filters in the dishwasher, the reason this isn’t recommended is because heat and pressure warp the mesh. The residue doesn’t fully rinse away and ends up being circulated around the room. Warm water will be the safest option and most effective in cleaning those difficult areas.

Another common mistake that people do is fitting the filters that are still wet after cleaning. It’s crucial mentioning again because it’s the most common thing that causes problems after a filter clean.

Ignoring damage. Torn mesh or a cracked frame means the filter needs replacing, not cleaning. A damaged filter lets unfiltered air through and the whole exercise becomes pointless. If you’re learning how to clean air con filters and they keep looking damaged on inspection, replacement is the answer.

When a Clean Won’t Fix It

Knowing how to clean air con filters is useful. It won’t fix everything. If the unit is still struggling after the filters are clean, something else needs looking at. Dirty coils, low refrigerant, a component that’s on its way out. These are engineer jobs, not DIY ones.

If the system hasn’t had a professional service recently, it’s worth booking one before the next heavy-use period. How to clean air con filters is useful knowledge, but a service covers what a filter clean can’t reach. Issues that seem minor in May have a way of becoming urgent in July. Air Conditioning Direct has been installing and maintaining systems across London, Essex, Hertfordshire, and Kent for over 25 years. We cover residential and commercial systems, all our engineers are fully qualified, and we include up to a 7-year guarantee on selected equipment.

If you are unsure if your air conditioning system is working correctly then get in touch with our team today and we can help you find the root of the problem.

Heat pumps have a reputation for being low maintenance and that reputation is mostly earned. Compared to a gas boiler, air source heat pump maintenance is genuinely less involved. But less involved doesn’t mean none at all. A system that gets ignored for years becomes a system that quietly costs more to run than it should, and eventually something that was a small fix becomes a bigger one. Understanding what air source heat pump maintenance actually involves means you know what to do yourself and what to leave to someone qualified.

Most of what keeps a heat pump running well is simple. Some of it you can do yourself. The rest is handled in an annual professional visit. Here’s how it breaks down.

The Outdoor Unit

This is where most of the DIY side of air source heat pump maintenance sits, and it’s also the thing most people forget about because the unit just sits there doing nothing visible.

The outdoor unit pulls air across coils to extract heat from it. That process depends on good airflow. Leaves pile up around the base. Grass grows toward it. Ivy finds its way in if you leave it long enough. None of this announces itself as a problem, it just quietly reduces how effectively the system can do its job.

Every couple of months, walk around it and clear what’s built up. That’s genuinely all it takes most of the time. Keep a metre or so of clear space on the side where air goes in. After a frost or a decent snowfall, have a look at the coils. The system handles ice itself through a defrost cycle, but if there’s a heavy build-up that clearly hasn’t shifted on its own, that needs someone to look at it. If the coils are visibly dirty, a gentle rinse with a garden hose is fine. Turn the unit off first. Don’t touch it with a pressure washer. 

Filters

Most heat pump systems have filters somewhere in the indoor unit or air handling components. They do the same job as filters in any air conditioning system: catch airborne dust and debris before it gets into the mechanism. And like any filter, they block up over time.

It’s recommended that you check the filters at least every month after using them to make sure they are kept clean, as dirty filters can result in mold building up which will lead to internal damage so it’s crucial that you check them yourself after some time . If they’re coated grey, clean them: vacuum off the bulk with a soft brush attachment, rinse under lukewarm water, after that leave them to try and only refit when they have fully dried.

Air source heat pump maintenance that lets the filters go is one of the quieter ways efficiency drops. It doesn’t cause a sudden problem, it just makes the system work harder than it needs to for longer than it should.

Refrigerant and Pipework

The refrigerant circuit is sealed. It shouldn’t need attention between services. If the system starts losing efficiency and everything else checks out, low refrigerant is something an engineer will look at. Refrigerant work is F-gas regulated and has to be done by someone qualified. There’s no DIY version of this.

What you can check yourself is the pipework connecting the two units. Look for damage to the insulation, any joints that look like they’ve been disturbed, or wear that’s crept in over time, particularly on any exposed sections. Insulation on refrigerant pipes matters more than people realise and it does degrade, especially outdoors.

The Heat Exchanger Coils

The coils on the outdoor unit collect dirt over time, more so in areas with high pollen, near agricultural land, or anywhere with a lot of airborne dust. Dirty coils mean less efficient heat transfer, which means the system works harder for the same output.

Coil cleaning is part of a proper annual service. Between services, a visual check and a careful rinse if they’re visibly dirty is something you can do yourself. Turn the unit off, use a hose on a gentle setting, work with the fins rather than against them.

What the Annual Service Covers

The things you can do yourself are the surface-level tasks. An annual service from a qualified engineer goes further: refrigerant pressure, electrical connections, controls calibration, defrost cycle testing, overall system performance. These need the right equipment and the right training.

If the system is under warranty, servicing is almost always a condition of keeping that warranty valid. Even without a warranty, it’s what catches the issues that DIY maintenance doesn’t reach. Air source heat pump maintenance split between regular homeowner checks and annual professional servicing is what keeps a system running at the efficiency it was designed for.

Air Conditioning Direct has been installing and maintaining heat pump systems across London, Essex, Hertfordshire, and Kent for over 25 years. We cover residential and commercial systems, all engineers are fully qualified, and we offer up to a 7-year guarantee on selected equipment. More on our heat pump services here.

Seasonal Checks

Before winter: Clear the outdoor unit, check filters, make sure the defrost cycle is working. The system works harder in the cold and going in clean makes a real difference.

After winter: Check pipework insulation for damage, clear anything that’s accumulated around the unit through the colder months, rinse the coils if they’ve collected debris.

Through summer: If the system is running for cooling, check filters more often. Dust builds up faster during heavy use periods and consistent air source heat pump maintenance through summer keeps efficiency where it should be.

Things Worth Paying Attention To

Ice on the outdoor unit that the defrost cycle isn’t clearing. Noise that wasn’t there before. The system runs noticeably longer to hit the target temperature. Energy use goes up without an obvious change in how the house is being heated or cooled.

None of these mean something has definitely gone wrong, but all of them are worth a call rather than leaving until the next service. Air source heat pump maintenance works best when small things get looked at before they become bigger ones.

For anything that needs a qualified engineer, get in touch and we’ll come out.

Most people in the UK think air con is a money pit because they compare it to old electric heaters. That is a mistake. Heating and cooling are different. A heater creates warmth but a cooler moves heat from one place to another. This is why the cost of running air conditioning is lower than you think. You aren’t paying to create cold; you are paying to move heat out of your house which is something lots of people do not realise.

How much does it actually cost per hour

If you look at your electric bill you will see a price per kilowatt hour. Usually this is around 25p or 30p right now. A medium unit might use 0.5kW once the room is actually at the right temperature. That means the cost of running air conditioning can be as low as 15p an hour. That is less than it costs to run a tumble dryer.

At Air Conditioning Direct we see people make the mistake of buying units that are too small. If a unit is too small for the room it never reaches the target temperature. It stays at full power all day and night. This is where the high bills come from. You need a unit that is powerful enough to “click off” into a low power mode. Buying a bigger unit can actually save you money on your monthly bill because it doesn’t have to work as hard.

Factors that change the cost of running air conditioning

You have to look at your house like a thermal box. Every bit of heat that gets in has to be pumped back out by the AC unit.

1. Thermal mass is a big deal: Bricks and furniture hold heat. If you let your walls get hot all day it takes hours of high power cooling to get that heat out. It is cheaper to turn the AC on early at a low setting than to blast it at 4pm when the house is already like an oven.
2. The height of your ceilings matters too. Heat rises so high ceilings give the hot air somewhere to go. If you have low ceilings the heat stays right where you are sitting and the AC has to fight harder to keep you comfortable.
3. Air Conditioning Direct often finds that poor maintenance is the hidden reason for high bills. If the outdoor unit is blocked by leaves or dirt it can’t get rid of the heat. The system keeps spinning its fans but nothing happens. This is just wasting electricity.
4. Humidity makes a difference. Sticky air feels hotter than dry air. Modern units have a “dry” mode. This uses less power than full cooling but makes the room feel much better by just pulling the moisture out of the air.

Portable units vs fixed systems

A lot of homeowners buy a portable unit because they want to avoid the install price. This is usually a bad financial move in the long run. Portable units are “single hose” systems. They blow hot air out the hose but that air has to come from somewhere. It gets sucked in from under doors or down chimneys. You are basically sucking warm air into the house while trying to cool it down.

A fixed system from Air Conditioning Direct uses a “closed loop” with refrigerant. No air is swapped between inside and outside. It just moves the heat. This is why a fixed system is about three times more efficient than a portable one. The cost of running air conditioning with a fixed unit is significantly lower and it will pay back the installation cost through lower bills within a few summers.

Ways to keep your bills low

If you want to be smart about it you should use a timer. Don’t wait until you are hot to turn it on. Set it to start an hour before you get home from work. This stops the heat from building up in your carpets and sofa. It is much cheaper to maintain a temperature than to drop it by ten degrees in one go.

Some people worry about the environment too. The good news is that these systems are very efficient. Because they move heat instead of making it, they are better for the planet than most other ways to stay comfortable. They also filter the air which helps if you have hayfever or live near a busy road in London.

Air Conditioning Direct has worked on thousands of homes over 25 years in London and the surrounding areas. We know that every room has a “sweet spot” for efficiency. We can show you how to find that spot so your bills stay low. We also offer a 7 year guarantee which is one of the best in the industry. It means we trust the kit we install to stay efficient.

It is better to think of AC as a tool for your health and sleep. If you sleep better you work better. The cost is small compared to the benefit of actually being able to use your home during a heatwave. If you want a quote or just want to ask about your specific house then give us a call on 020 8989 8989 or fill in our online contact form. A member of our team will be in touch and discuss the best options for you before the summer heat arrives. 

It used to be that air conditioning was something you only ever saw in offices or shops. You’d walk in from a sticky London pavement and feel that blast of cold air and wish you had it at home but things have changed lately. Our summers are getting hotter and the old way of just opening a window doesn’t really cut it when it is thirty degrees outside. If you are looking into a split AC UK system for your house or flat then you have probably realised there is a lot of information to get through.

At Air Conditioning Direct we spend a lot of time talking to homeowners who are tired of sleepless nights. They want something that works but doesn’t look like a massive industrial machine stuck to the wall. That is where modern wall-mounted systems come in. They are quiet and they look much better than they used to.

Finding the right split AC UK setup for your home

A split system is called that because it is split into two parts. You have the unit inside that blows the cold air and a condenser unit that sits outside. They are connected by small pipes so you don’t need huge ducts running through your ceiling. This makes them much easier to install in older British houses where space is tight.

When you start looking for a split AC UK solution you need to think about how many rooms you actually want to cool. A single split is just one indoor unit and one outdoor unit. This is perfect if you just want the master bedroom to be comfortable so you can actually sleep. But if you want the whole house done you might look at a multi-split system. This lets you connect several indoor units to just one outdoor box. It saves space in the garden or on your balcony which is handy if you live in a terraced house or an apartment.

You also need to consider the power of the unit. This is usually measured in BTUs. If you get a unit that is too weak it will run constantly and never actually cool the room. If it is too powerful it will keep switching on and off which wastes electricity. We can help you figure out the exact size you need based on how big your room is and which way your windows face.

Why wall-mounted units are the top choice

Most people go for wall-mounted units because they are the most cost-effective. They sit high up on the wall so they stay out of the way of your furniture. Modern ones from brands like Daikin or Mitsubishi are actually quite slim. They don’t stick out as much as the old ones did which is why they are regular products we work with.

One of the best things about these systems is that they aren’t just for cooling. They are actually heat pumps. This means they can heat your room in the winter too. In fact they are often more efficient than electric radiators or even gas central heating for warming up a single room quickly. If you have a home office that gets a bit chilly in October you can just flick the AC on to heat mode and it’s warm in minutes.

Another thing to look for is inverter technology. Old air con units were either on or off. It was very basic. Modern inverters can slow down or speed up depending on the temperature. It is much smoother and it saves a lot of money on your energy bills. And because they are so quiet you can leave them on while you sleep without it sounding like a plane is taking off in the corner of the room.

What to expect during the installation

We know a lot of people worry about the mess of an installation. They think walls are going to be knocked down but it isn’t really like that. A standard install usually involves drilling one small hole for the pipes and wires to go through. We cover the pipes with neat trunking on the outside so it looks tidy.

At Air Conditioning Direct we make sure the outdoor unit is placed somewhere sensible. You don’t want it right next to your patio where you sit and have a coffee. It needs a bit of space around it for the air to circulate. We handle all the technical bits like the refrigerant gas which has to be done by a qualified engineer. It is not a DIY job because you need a F-Gas certificate to handle the chemicals properly.

Most installs can be finished in a single day. We show you how to use the remote and how to set the timers. A lot of the new systems come with Wi-Fi now. This means you can turn the air con on using your phone while you are on the train home. Walking into a cold house after a long day at work is a great feeling.

Keeping your system running well

Once you have your split AC UK system fitted you need to look after it. It isn’t a lot of work but you can’t just forget about it. The indoor units have filters that catch dust and pollen. If these get clogged the system has to work harder and it might start to smell a bit musty. You can usually just pop the front cover open and hoover the filters or rinse them under a tap.

We recommend a professional service once a year. We come out and check the gas levels and make sure the outdoor unit is clear of leaves and dirt. This keeps your warranty valid and makes sure the system lasts for years. A well-maintained air con unit can easily last fifteen years or more if you treat it right.

It is also worth thinking about where you put the indoor unit. You don’t want it blowing directly onto your face while you are in bed. It is better to have it to the side so the air circulates around the room. We can give you advice on the best positioning when we come round for a site survey.

Making the final decision

Investing in air conditioning is a big step but it really changes how you use your home. No more melting in the lounge during a heatwave or struggling to breathe in a stuffy bedroom. It makes the air cleaner too because the filters pull out a lot of the allergens.

If you are unsure about what you need just give us a call or complete our online contact form. We have been doing this for a long time and we know what works in different types of British homes. We don’t use high-pressure sales tactics. We just give you a straight price for a system that will actually do the job.

Living in the UK doesn’t mean you have to be uncomfortable for three months of the year. A good split AC UK system is a permanent solution that adds value to your house and makes your life much easier. And when that next heatwave hits you will be very glad you got it sorted.

As the British summer gets hotter every year we all start thinking about how to stay comfortable at home or in the office. Nobody wants to sit in a sticky room when it is 30 degrees outside but there is always that worry about the electric bill going through the roof. You might have heard that air conditioning is a massive money pit but things have changed a lot lately. Modern systems are much better at managing power than the old clunky units from years ago. If you are looking to stay chilled without the stress of a huge bill, here is how it works.

Understanding air con energy efficiency

When you start looking at new units you will see a lot of acronyms like eer and seer. These sound complicated but they are just ways to measure how much cooling you get for every pound you spend on electricity. Eer stands for energy efficiency ratio and it tells you how efficient the unit is at a specific moment. Seer is the seasonal version which is more useful for us in the uk because it looks at how the unit performs over a whole summer season.

The higher the number the better it is for your wallet. A modern split system often has a high rating because it uses inverter technology. Instead of the motor turning on and off at full blast like a light switch it works more like a car accelerator. It slows down or speeds up to keep the temperature steady. This is a big deal for air con energy efficiency because it stops those big spikes in power usage that happen when a machine has to work hard to start up again.

At Air Conditioning Direct we see how much of a difference the right setup makes. It is not just about buying the most expensive box on the wall. It is about making sure the unit is the right size for your room. If a unit is too small it will run constantly and still not get the room cold. If it is too big it will keep clicking on and off which wastes power. Getting that balance right is the first step to saving money.

How to boost air con energy efficiency in your home

There are plenty of small things you can do to help your system work better. You do not need to be an expert to make these changes. First off, keep your windows and doors shut when the air con is running. It sounds obvious but you would be surprised how much cold air escapes through a door left ajar. If you leave a window open your unit is basically trying to cool down the whole of London and that is never going to happen.

Another simple trick is to use your blinds or curtains. If the sun is beaming through a south facing window it creates a greenhouse effect. Your air conditioning has to work twice as hard to fight that heat. By closing the curtains during the day you keep the worst of the heat out before it even gets inside.

Maintenance is also a massive factor. If the filters are clogged with dust the air cannot flow properly. This makes the motor work harder and uses more electricity. We always recommend a quick check of your filters every few weeks. It only takes a minute to clean them but it keeps the system breathing easily. A well maintained unit is always going to be more efficient than one that has been ignored for years.

What does it actually cost to run?

Most people think running the air con is like leaving the oven on all day but it really is not. For a standard 2.5kw unit in a bedroom you might only be looking at about 10p to 15p an hour. If you only use it for a few hours in the evening to help you get to sleep it is often cheaper than running a tumble dryer.

The cost depends on your electricity tariff and how hard the unit has to work. If you set the temperature to 18 degrees when it is boiling outside the unit will work flat out but if you set it to a comfortable 22 or 23 degrees it will reach that goal much faster and then just tick over. That small difference in the thermostat setting can have a big impact on your monthly bill.

Using a team like Air Conditioning Direct helps because we look at the details to ensure your installation is optimised. We focus on making sure every part of the system is placed where it can do the most good. If the outdoor unit is stuck in a spot with no airflow it will struggle to dump the heat it has pulled out of your house. Clear space around the units is vital for keeping things running smoothly.

Choosing the right system for you

If you are tired of those cheap portable units that come with a big hose out the window you might want to consider a fixed split system. Portable units are okay for a quick fix but they are usually quite loud and not very efficient. They often pull warm air into the room through gaps in the doors because they are blowing so much air out of the hose.

A fixed split system is much better for long term air con energy efficiency. The noisy part stays outside and the indoor unit is designed to circulate air much more effectively plus they can also act as heat pumps in the winter. This is a bit of a hidden benefit because heat pumps are incredibly efficient at warming a room up. Instead of using a plug in electric heater which is expensive you can use your air con to stay warm for a fraction of the cost.

We have been helping people across London and the home counties for over 25 years at Air Conditioning Direct. We know the local buildings and what works best for different types of properties. Whether you are in a flat in Shoreditch or a house in Essex the goal is the same. You want a system that works without you having to worry about the cost every time you press the power button.

Final thoughts on staying cool

Keeping your home comfortable does not have to be a luxury that breaks the bank. By picking a unit with a good seer rating and doing a bit of basic maintenance you can enjoy a cool house all summer long. Remember to keep those curtains shut when the sun is out and don’t set the thermostat lower than you actually need.

If you are thinking about an upgrade or a new installation we can help you figure out the best path forward. At Air Conditioning Direct we pride ourselves on being honest about what you need and what you don’t for your commercial and residential property. There is no point in overcomplicating things. A simple well installed system will give you the best air con energy efficiency and keep you comfortable for years to come.

If you want to chat more about how we can help your home or business stay cool just get in touch with us at Air Conditioning Direct. We offer a 7 year guarantee on parts and labour for many of our systems so you can have peace of mind that you are making a solid investment. Stay cool and don’t let the heat get to you this year. Contact us today to find out more by calling 020 8989 8989 or completing our online contact form.

If you’ve been googling types of aircon and feeling more confused the longer you scroll, you’re not alone. Split systems, cassettes, multi-splits, VRF, heat pumps… it all sounds a bit technical when all you really want is a comfortable temperature and a sensible running cost.

As a quick intro, Air Conditioning Direct has been supplying and installing air conditioning across London and the South East for over 25 years, working on everything from studio flats to large offices and commercial kitchens. That day-to-day experience is what this guide is based on – not just theory.

Below, we’ll walk through the main types of aircon used in UK homes and businesses, what each one is good at, and the things to watch out for.

1. Before you choose: what actually matters?

Before we get into the different air conditioning units, it helps to think about:

• Your space – size of rooms, ceiling height, layout, number of people
  
• Use – home vs office, occasional use vs all-day, all-year comfort
  
• Electrics and building limits – especially in flats or listed properties
  
• Running costs and energy efficiency
  
• Noise levels – crucial for bedrooms, studies and meeting rooms
  
• Whether you own or rent – affects whether permanent installation is possible
  

When we visit customers at Air Conditioning Direct, we usually start with a quick site survey and talk through these points in plain English. The “best” system on paper isn’t always the right one for how you actually live or work.

2. Wall-mounted split systems

If you picture a typical aircon unit on the wall of a bedroom or office, it’s probably a wall-mounted split system.

What it is:

• One indoor unit on the wall
  
• One outdoor condenser unit usually on a wall, balcony or flat roof
  

Best for:

• Bedrooms, lounges and home offices
  
• Small to medium commercial rooms
  
• Retrofitting in existing properties
  

Pros:

• Generally the most cost-effective, all-round option
  
• Efficient cooling and heating (many are heat pumps)
  
• Quiet operation, ideal for sleeping areas
  
• Good control over temperature in individual rooms
  

Cons:

• You need somewhere suitable for the outdoor unit
  
• You’ll see the indoor unit on the wall (though modern ones are quite sleek)
  

For many UK homes, a simple wall-mounted split system is the “sweet spot” between performance, price and neatness, which is why we install so many of them.

3. Multi-split systems

Take the idea of a single split system and scale it up and you get a multi-split air conditioning system.

What it is:

• Several indoor units (often wall-mounted or floor-mounted)
  
• Connected to one outdoor unit
  

Best for:

• Homes where you want multiple rooms cooled or heated
  
• Flats where there’s only space for one outdoor unit
  
• Small offices or shops
  

Pros:

• Only one outdoor unit, so the exterior of your property looks tidier
  
• Independent control of each room
  
• Often more efficient than running lots of separate portable units
  

Cons:

• Pipework design needs more planning
  
• If the outdoor unit fails, several rooms are affected
  
• Installation cost is higher than a single split (though still sensible long-term)
  

For London properties with limited outdoor space, a multi-split system can be a very neat solution.

4. Ducted / central air conditioning

If you want a completely hidden system, ducted aircon is usually the way to go.

What it is:

• Indoor unit concealed in a loft space, cupboard or suspended ceiling
  
• Air distributed via ducts to grills or diffusers in ceilings or walls
  

Best for:

• New builds or major refurbishments
  
• Larger homes where aesthetics are a priority
  
• Offices, shops and other commercial spaces
  

Pros:

• Very discreet – all you see are grilles or vents
  
• Can serve multiple rooms from one central system
  
• Even air distribution, which feels very comfortable
  

Cons:

• More invasive installation, often needing ceiling voids or loft space
  
• Higher upfront costs than a single split wall unit
  
• Design is crucial – poor ductwork equals poor performance
  

At Air Conditioning Direct we tend to recommend ducted systems when a client is already doing building work or has plenty of ceiling void space to play with.

5. Ceiling cassette units

You’ll see ceiling cassette air conditioners in many shops, restaurants and offices.

What it is:

• Indoor unit recessed into the ceiling grid
  
• Air is blown out on two, three or four sides
  

Best for:

• Open-plan offices
  
• Retail spaces and salons
  
• Areas with suspended ceilings
  

Pros:

• Great coverage in open spaces
  
• Keeps the walls free for shelving or décor
  
• Good option when wall space is limited
  

Cons:

• Needs a suspended ceiling to hide the bulk of the unit
  
• Installation can be more involved than a simple wall unit
  

If you’ve got a high street shop, café or open-plan workspace and you’re exploring different types of aircon, ceiling cassettes are almost always on the shortlist.

6. Floor-mounted and low-wall units

Think of these a bit like a slimline radiator that also cools.

What it is:

• Indoor unit installed low down on the wall or on the floor
  
• Connected to an outdoor unit like any other split system
  

Best for:

• Loft conversions or rooms with sloping ceilings
  
• Spaces with very limited high wall space
  
• Replacing old storage heaters in some cases
  

Pros:

• Good option when a wall-mounted unit is tricky
  
• Airflow can feel more natural at seated height
  
• Often easier to service if access at height is an issue
  

Cons:

• Uses up floor or low wall space
  
• Not quite as popular in the UK, so choice can be slightly narrower
  

We often suggest floor-mounted units in quirky London properties where roof lines and beams make traditional wall units awkward.

7. Portable air conditioners

If you rent or can’t install anything permanent, portable aircon units have their place.

What it is:

• Stand-alone unit on wheels
  
• Usually vents hot air out of a window via a flexible hose
  

Best for:

• Renters who can’t alter the property
  
• Short-term or occasional use
  
• Spot-cooling a room during heatwaves
  

Pros:

• No permanent installation required
  
• You can move them between rooms
  
• Lower upfront cost
  

Cons:

• Noisier than fixed systems
  
• Less energy efficient
  
• You need to manage the exhaust hose and often a window kit
  
• Can struggle in larger or south-facing rooms
  

If you own your home or commercial space and want reliable, year-round comfort, we’ll almost always steer you towards a fixed system rather than relying solely on portable units.

8. Heat pumps and all-year climate control

A lot of modern air conditioning systems are actually air-to-air heat pumps. That means they:

• Cool in summer by removing heat from the indoor air
  
• Heat in winter by extracting warmth from the outside air, even when it feels chilly
  

For many of our customers, this replaces or reduces the need for traditional electric heating and can be more efficient, especially with well-insulated properties.

If you’re thinking long-term and want both heating and cooling in one system, asking about heat pump-based aircon is a smart move.

9. Matching the type of aircon to real-world scenarios

To make this more concrete, here are a few common setups we see at Air Conditioning Direct:

• One-bed flat in London:
  Often a single wall-mounted split system in the lounge, sometimes a second in the bedroom, or a small multi-split.
  
• Three-bed semi-detached house:
  Wall-mounted units in main bedrooms and lounge, often on a multi-split system, or a small ducted system if there’s a loft and the client wants everything hidden.
  
• Small office or salon:
  One or two wall units or a ceiling cassette, depending on layout and ceiling type.
  
• Restaurant / open-plan office:
  Usually a mix of ceiling cassettes or ducted aircon with proper zoning and controls.
  

Every property is different, which is why a site visit and proper design matters. Two spaces of the same size can need different types of aircon depending on insulation, glazing, equipment, people and usage.

10. Why work with Air Conditioning Direct?

Choosing between all these types of aircon is much easier when you’ve got someone experienced in your corner.

At Air Conditioning Direct:

• We’ve got over 25 years’ experience in residential and commercial air conditioning across London and the surrounding areas
  
• We design, supply, install and maintain systems from leading manufacturers
  
• We offer up to a 7-year guarantee on selected equipment when we install and maintain it
  
• Our engineers are fully qualified and used to working in homes, offices, shops and more
  

If you’re weighing up your options and want straightforward advice, you can explore more on our website at ac-direct.co.uk or get in touch for a free, no-obligation chat about your space.

Final thought

There’s no single “best” system. The right choice comes down to your property, how you use it and what matters most to you – be that aesthetics, energy efficiency, budget or all-year comfort.

Hopefully this guide has demystified the main types of aircon and given you a clearer idea of where to start. If you’d like tailored recommendations for your home or business, Air Conditioning Direct is here to help, contact us today by calling 020 8989 8989 or completing our online contact form.