How Much Does Air Conditioning Cost to Run?

The cost of running air conditioning in a typical home varies, but at the current energy price cap, you can expect to spend from 8p to 37p per hour. This will depend on how much electricity the unit draws and the tariff you are on. Luckily, you can estimate your own costs for a clearer understanding. Just multiply the unit’s electrical input power (in kW) by your electricity rate (in pence per kWh).

For most homes, using air conditioning sensibly through warmer months, running costs can be a modest addition to your electricity bill rather than a major expense.

If you are considering air conditioning for your home, it’s not just the cost of the electricity it uses that should be a factor. The unit cost and potential expenses for repair and maintenance should also be considered before you buy.

Summary:

• Running modern air conditioning typically costs around 8p to 37p per hour depending on the electrical draw of the unit and the tariff you are on.
• Estimate your cost with a simple formula: electrical input (kW) x electricity rate (p/kWh)=cost per hour.
• The biggest cost factors are your rate, how often you use the unit, the room size, insulation, unit type and SEER.
• Running costs also include repairs and maintenance, not just electricity use.
• For cooling alone, heat pumps and air conditioning units cost roughly the same to run.

Air conditioning running costs at a glance

The above figures are based on the Ofgem price cap rate of 26.11p per kWh. This applies to customers paying by direct debit and using a typical amount of electricity. These prices will change from 1^st October 2026.

Is air conditioning expensive to run?

Air conditioning isn’t as expensive to run as people think. Most modern units use relatively little electricity and deliver high levels of energy efficiency. It’s how you use it that can be the biggest drain on cash.

Cooling a single room, such as your bedroom or a home office, is far cheaper than trying to regulate the temperature of the entire house. Used this way, wall-mounted units can cost roughly the same to run per hour as many of your everyday appliances. During a regular British summer, the total cost of running air conditioning is manageable for most households.

What affects the cost of running an air conditioning unit?

There is no single fixed price for running your air conditioning. Several factors contribute towards the cost, so having the same air conditioning model as your neighbour doesn’t necessarily mean you’ll be paying the same to use it.

• Your electricity rate: The price you pay per kWh is a direct multiplier on every hour of use. A cheaper tariff means cheaper running costs.
• How often it is used: Running the system all day every day will cost much more than occasional use during hot spells.
• Room size and layout: Larger open-plan spaces take much longer to cool than a single enclosed room, meaning your system runs for longer.
• Unit type: A fixed-wall unit should cost less to run than a portable unit as the portable set up loses efficiency through its exhaust hose.
• Energy efficiency rating: Systems with a higher SEER rating use less energy to deliver the same level of cooling.
• The temperature outside: The warmer it is outside, the harder the system has to work to reach your desired temperature.
• Insulation: A well-insulated home keeps the cool air in, meaning your unit doesn’t have to work as hard.

How can you work out the running costs of your air conditioning?

To get a rough idea of the running costs of your air conditioning, you’ll need to know two things:

1. The electrical input power of your unit in kW: You’ll find this on the label or the user manual. It is the electricity the unit draws, not its cooling output, which is a larger number.
2. Your electricity rate in pence per kWh: You’ll see this on your latest electricity bill or on the app or website of your supplier.

The example below will give you a rough idea:

• A wall-mounted unit drawing 0.5kW
• Current price 26.11p per kWh
• 5kWx26.11p=13p per hour

Leave your air conditioning running for six hours during the peak of summer, and you’ll expect to pay around 78p per day. It’s also worth noting that many systems won’t run at full power during use. Inverter systems ease off once the room reaches the desired temperature. This means that, quite often, actual costs are lower than calculations may suggest.

Does using air conditioning all day cost more?

Having your system running all day naturally uses more electricity, but how you run it matters as much as how long it is on for. Modern inverter units are often more efficient when maintaining a steady, moderate temperature than when repeatedly cooling a warm room from scratch.

Stick to these habits for sensible all-day use:

• Set a sensible temperature rather than the lowest possible setting
• Let the system maintain a temperature rather than having it start from scratch multiple times
• Use zoning or single-room control to cool only the spaces you are using

In most homes, cooling just one or two occupied rooms for part of the day is far more cost-effective than having a whole-house system run for hours on end.

The air conditioning running costs you might forget

Many people overlook repairs, servicing and maintenance of an air con unit. These are running costs you need to keep on top of, as failing to maintain your unit or repair it when faults arise could lead to significant expense further down the line.

The main ongoing running costs to plan for include:

• Annual servicing: A once-a-year service of your air conditioning installation ensures it runs smoothly and efficiently. It’s often a term of the manufacturer’s warranty, so skipping it could void your guarantee and shorten the lifespan of your unit.
• Filter cleaning: Dirty filters restrict airflow and force the unit to work harder. A quick clean every few weeks is an easy DIY job that protects your air con at very little cost.
• Refrigerant top-ups: Over the years, your refrigerant levels may drop. You’ll need a qualified engineer to top it up, as handling of the gas is heavily regulated.
• Occasional repairs: As with any appliance, parts wear over time and may fail. Your annual service will spot these issues, but if you notice anything unusual, such as smells coming from your air conditioning, or are concerned the unit isn’t functioning properly, let us know. Fixing a problem early can save a lot of money and time in the future.

Keeping your air conditioning well maintained not only ensures it lasts longer but also helps it run as efficiently as possible. Installation is another cost to consider; you could spend anything from around £1,200 to more than £4,000 per unit. We explore how much it costs to install air conditioning in Sussex.

How to keep air conditioning running costs down

You can keep your energy bills down and get the best from your air conditioning by following these simple habits:

• Set the temperature for around 18 to 21°C
• Keep doors and windows closed when the air con is running
• Use timers and smart controls so it only runs when needed
• Clean the filters regularly to maximise airflow and efficiency
• Block direct sunlight with blinds or curtains so there is less heat for the unit to compete with
• Cool one room at a time rather than the whole house

Combined, you’ll find that these changes make a significant difference to your energy use and costs over time.

Is air conditioning cheaper than a heat pump?

For cooling alone, the running costs are fairly similar. The true difference is noticed in winter.

A standard air conditioner cools your property well but won’t do much for warming the home, so you’d need a separate heating system for that. An air-to-air heat pump is basically an air con unit that can also work in reverse. It’ll heat your home as well as cool it, and in colder seasons, it delivers much more efficiency than electric heaters.

If year-round comfort is the aim and you want one system to cover both jobs, a heat pump can be the better long-term value option. If you already have efficient heating in place and only want to cool your home in the summer, air conditioning is the more cost-effective choice. We explore the running costs of heat pumps in a detailed guide.

Ready to have air conditioning installed?

For most homes, air conditioning can be an affordable way to stay comfortable through increasingly hot summers. Use the unit sensibly and keep it maintained, and your running costs should remain manageable. If you are ready to explore options for your home, speak to our team. Our experienced and F-Gas qualified engineers at Sussex Air Conditioning & Heat Pumps are on hand across the county to install, repair and service air conditioning units. Call us today on 01273 434586 to book your installation.