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Free calculator

BTU Calculator

Work out the recommended unit size and rough cost for cooling a room, based on its dimensions and a few quick questions.

Estimate your installation cost

Answer a few questions about the room and get an instant BTU, unit size and cost estimate. This is a guide, not a quote — for exact pricing, request quotes from local installers below.

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Step-by-step, takes under a minute

Get your free quotes

Answer a few short questions and we'll match you with up to three local installers. No account needed.

What type of property is it?

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Office
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A little more detail

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Where's the property?

Where should we send your quotes?

Common questions

Yes. There's no charge to homeowners at any point. Installers pay us a small fee when they're matched with a lead, which is how the service stays free for you.
No. Requesting quotes doesn't commit you to anything. You're free to compare, ask questions, or decide not to proceed at all.
We check for relevant accreditation, F-Gas certification, public liability insurance and a track record of completed installations before anyone joins our network.
Most homeowners hear from at least one installer within 24 hours of submitting the form.
We currently focus on London and the surrounding boroughs, with other UK cities being added over time.
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