What does AC actually cost to run?
Most people overestimate running costs. A modern A+++ inverter unit is far cheaper than an old portable or electric heater. Use the calculator below to see typical daily, monthly and seasonal costs for your room.
AC running-cost calculator
See what it costs to keep a room cool with a modern A+++ inverter unit.
p/kWh
Based on seasonal COP of 3.8 — inverter units rarely run at full power.
Per day
£1.28
Per month
£38.37
A season
£230.21
Get a fixed-price quote
Estimates only. Actual running costs depend on insulation, shading, set temperature and usage.
Why inverter units cost less
- They ramp up and down instead of switching on/off at full power.
- Seasonal COP of 3.5–4.5 means 1 kWh of electricity moves 3.5–4.5 kWh of heat.
- Cooling one bedroom for 6 hours is often under £1/day at current tariffs.
Want a fixed-price install quote?
Send us a photo of the room on WhatsApp and we'll reply with a real price the same day — no pressure, no spam.