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UK Air Conditioner Running Costs Calculator
Use the calculator below figure how much your air conditioning system will cost to run.
Please, note the electricity price calculations are based on current business electricity rates.
If you are home customer, you should use the current price cap rate of 26.11 pence per kWh from 1 July to 30 September 2026.
What does your air conditioning really cost to run?
Estimate the electricity cost of a central or portable AC system, then see how much a better energy rate could save you.
How air conditioning uses electricity — and how to use less
An air conditioner doesn’t make cold air; it moves heat out of a room. Understanding that one idea explains both why AC costs what it does and where the savings are hiding.
Where the electricity actually goes
Because the job is moving heat rather than generating cold, a good system can shift far more heat energy than the electrical energy it draws — often three to four times as much. The compressor does the heavy lifting and accounts for the bulk of consumption; the indoor and outdoor fans add a smaller, steadier draw. This is also why efficiency matters so much: two units cooling the same room to the same temperature can have very different bills depending on how much heat they move per unit of electricity.
What drives your running cost
Five things multiply together to set your bill. The calculator above turns them into a number, but it’s worth knowing each lever:
Power & efficiency
- Capacity (BTU or kW): bigger output draws more power.
- Efficiency rating: a higher SEER/EER moves more heat per kWh.
- Unit type & condition: portables and older or dirty units work harder.
How you run it
- Hours of use: every running hour adds directly to the cost.
- Target temperature: the cooler you set it, the harder it works.
- Heat load: sun, poor insulation, equipment and people all add work.
The sixth factor sits outside the machine entirely: the unit price you pay per kWh. Since it multiplies everything above, a higher tariff inflates every hour of cooling — which is why the same unit can cost very different amounts at two different businesses.
What to look for to cut usage
When buying or specifying
- Check the energy label (A–G) and the SEER/EER figure — higher is better.
- Choose an inverter (variable-speed) compressor over fixed-speed on/off.
- Right-size it: an oversized unit short-cycles and wastes energy; undersized runs flat out.
- For portables, a dual-hose design is more efficient than single-hose.
How you run it day to day
- Set a sensible target — around 24–26°C; each degree lower noticeably raises usage.
- Use timers and zoning so you only cool occupied spaces during opening hours.
- Keep doors and windows shut and use blinds to block direct sun.
- Add a smart thermostat or scheduler to avoid cooling an empty building.
Maintenance
- Clean or replace filters regularly — clogged filters force the unit to work harder.
- Keep the outdoor condenser clear of leaves, dust and obstructions.
- Have refrigerant levels checked; low charge cuts efficiency sharply.
The building itself
- Shade and insulate — less heat getting in means less cooling needed.
- Seal gaps around windows, doors and portable-unit window kits.
- Cut internal heat from lighting and equipment where you can.
The biggest lever is often the one outside the machine. Efficiency upgrades and good habits reduce how much electricity you use, but the price you pay per kWh decides what each of those units costs. Trimming both — usage and tariff — is where businesses see the real difference.