UK air con calculator

What size air con does this room need?

Add the room size, windows, insulation and number of people. We will suggest an air con size and estimate what it may cost to run.

Planning several rooms or a whole home? Use the home planner

ABOUT YOUR ROOMUnited Kingdom

Location and room size

Postcode or city Floor area m² Ceiling height m Window area m² Window direction

Home details

Home type When was it built? What are the windows like? Window film Sun protection Window U-value W/m²K, optional Window solar gain SHGC / g-value, optional

These answers choose a recognised default. If you have a window or film rating, enter it to replace the default. If you are unsure, leave it blank and we will show the assumption.

Room details and energy use

Insulation External walls Usual occupants Target temperature °C Cooling use hours/day Electricity rate p/kWh Solar panel size (optional) kWp Top-floor room / roof above

Use this as a starting point. Ask an installer to check the final unit size before you buy.

YOUR ESTIMATE WILL APPEAR HERE

See the size and running cost.

Fill in the room details to see a suggested unit size, expected running cost and how much solar may cover.

WHAT YOU WILL GET

See what size air conditioner may suit the room.

You will also see expected energy use, running cost and how much solar may cover. We show which parts of the room add the most heat and which sources support the estimate.