How much does an air conditioning unit cost to install?
Air conditioning isn’t a one-price-fits-all kind of purchase. The initial installation cost depends on your home, the type of system you go for and how it needs to be installed. So rather than a single and set figure, it’s more about understanding what shapes the price and what that might mean for your home setup.
Published on 22nd May 2026 by:
Ian Brown, Senior Commercial Manager, Installs
How much does air conditioning cost to install in the UK?
The cost of air con largely depends on the type of system you choose and your home set up. To give you an idea, portable units are usually the lowest cost upfront, while wall mounted systems for single rooms sit in the middle. On the upper end, multi-room systems tend to be more expensive due to the extra equipment and installation involved.
To get a clearer idea of what air conditioning might cost for your home, you can start with a British Gas online quote. It only takes a few minutes to answer some questions and get an initial estimate. From there, you can share photos of your home for a more accurate quote, and if needed, we can arrange a quick video call with an expert to help you get set up.
What affects the initial cost of air conditioning?
There are a few key things that are likely to influence the overall cost. These include:
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Type of system – a single room setup is usually simpler (and cheaper) than a multi-room system
Size of your home – larger areas need more powerful or additional units
Installation complexity – layout, access and pipework routes can all affect the work involved
Number of units – more rooms mean more equipment
Energy efficiency – higher-rated systems may cost more upfront but can reduce running costs
Because every home is different, the final cost is always tailored rather than fixed.
Types of air conditioning systems
There isn’t just one type of air conditioning system and the right choice usually depends on your home and how you want to use it. Some are designed for single rooms, while others can cover multiple spaces or even the whole home.
Let’s look at your options below.
Wall mounted systems
Wall mounted systems are one of the most common options for homes, and usually the most affordable fixed system to install. They’re designed for single rooms and are a good choice if you want to focus on specific spaces like bedrooms or living areas.
Multi-room systems
Multi-room systems allow you to control the temperature in several rooms using one outdoor unit. They tend to cost more than a single wall mounted system, as there’s more equipment involved and the installation is a bit more complex.
Ducted systems
Ducted air conditioning is usually the most expensive fixed system. It uses hidden ductwork to distribute air throughout the home for a more seamless finish. Because of the installation work involved, it’s often chosen for larger homes or during major renovations. British Gas doesn’t offer this type of air conditioning.
Portable air conditioners
Portable air conditioners are the lowest cost option upfront and don’t require permanent installation. However, they are less efficient than fixed systems, as they sit inside the room and vent warm air through a hose.
They can be useful for occasional use or smaller spaces, but they’re generally less efficient than fixed systems and not designed for whole-home comfort.
Installation costs vs running costs
It helps to think about air conditioning costs in two parts — what you pay upfront, and what it costs to run.
Installation costs depend mainly on the system you choose. Portable units sit at the lower end, while wall mounted systems are typically mid-range. Multi-room and ducted systems cost more because they involve more equipment and a more involved installation.
Running costs are a bit different. They’re influenced by how efficient the system is and how you use it day to day. A more efficient system might cost more to install, but it can use less energy over time. And simple habits like keeping a steady temperature or only cooling the rooms you’re using can help keep costs down.
Additional air con costs to consider
The main cost of air conditioning is usually the system and installation, but there can be a few additional factors depending on your home.
Some homeowners choose optional maintenance or warranty cover to help keep the system in good condition over time. With British Gas, every installation includes a 5-year manufacturer guarantee on air conditioning units, so you have built-in reassurance. But it’s also a good idea to book in an annual service as you would with traditional heating and cooling systems.
In some cases, small adjustments may be needed to support the installation, such as electrical or insulation updates. If anything like this is required, it’s always explained clearly before work starts.
Spread the cost of air conditioning
For most households, air conditioning is as much about managing cost as it is about comfort.
With British Gas, you can choose a payment option that suits your budget. We have a range of loans available, including interest-free for up to 2 years, all available with £0 deposit (subject to status). If you prefer, you can also pay in full, with a 10% deposit followed by the remaining balance after installation.
Get a clearer idea of cost with British Gas
The simplest way to understand what it might cost is to get a personalised quote based on your property. That way you can see what system works for your space and what the installation would involve.
With British Gas, you can start with a quick online estimate and then get expert guidance on the next steps when you’re ready.