The £2,500 air-to-air grant, explained honestly

If your home overheats and you are weighing a cooling system, you have probably seen the £2,500 figure and a lot of confident promises attached to it. Most of them skip the one condition that actually decides whether you get a penny. This guide is the honest version: what the grant is, the single case it applies in, the case it does not, and how to check which one is you - without a sales call.

What the grant actually is

The £2,500 air-to-air grant is a pathway of the government's Boiler Upgrade Scheme (BUS). Most coverage frames the scheme as a heating story, and it largely is - but it includes a pathway for air-to-air heat pumps, which cool in summer and heat in winter from the same unit. That is the only route by which a system that cools your home can be part-funded by the state. The catch is a firm condition that the incumbents chasing grant clicks tend to gloss over.

The two honest branches

Eligible - you replace your heating. You are eligible for the £2,500 air-to-air grant (Boiler Upgrade Scheme) only when an air-to-air heat pump replaces your fossil-fuel or electric heating and is fitted by an MCS-certified installer. The heat pump then does your heating as well as your cooling, and the old system is decommissioned, not kept alongside it. On this route a system in the low thousands installed can come down by the full £2,500.

Not eligible - you keep your heating. If you keep your boiler and add cooling as an extra, that is a cooling-only add-on, and it is not eligible for the £2,500 grant - whatever your current heating type. A private-pay air conditioning unit (a single-split, for one hot room) is a perfectly good answer, but it is an F-Gas / REFCOM job with no grant - not MCS, which applies only to the grant-eligible heat-pump route.

The word that decides it is replace. Adding air-to-air and keeping your boiler does not qualify; replacing your heating with it can. (Grant rules as of August 2026 and subject to change.)

Storage heaters are the clearest qualifying case

If your home runs on electric storage heaters, electric panel radiators or electric underfloor heating, you are looking at the case this grant tier was created for. Ofgem's condition is that the heat pump replaces "an existing fossil fuel or electric heating system", and the air-to-air pathway exists precisely because homes without wet central heating - electric-heated flats, off-gas-grid properties - previously had no heat-pump grant route at all.

That matters practically as well as technically. Storage-heated homes tend to carry the highest running costs of any heating type in the country, so this is usually where the switch pays back fastest, quite apart from the grant.

The part almost nobody mentions: you cannot claim it yet

This is the single most important thing on this page, and you will struggle to find it stated anywhere else.

The grant is real and it is law. The Boiler Upgrade Scheme (England and Wales) (Amendment) Regulations 2026 brought air-to-air heat pumps into the scheme at £2,500 on 28 April 2026. So the sites still telling you the air-to-air grant "starts in 2027" are out of date.

But only an MCS-certified installer can claim it, and the installer can only claim against a product listed on the MCS Product Directory. As things stand, no air-to-air product appears on that directory, which means no installer in the country can generate a compliant Boiler Upgrade Scheme voucher for an air-to-air system today, however eligible your home is.

MCS 007 v8.0, the heat pump product standard, brings air-to-air units into scheme scope from 5 December 2026, and MCS has said it is working with certification bodies to have products ready. Vouchers should follow as certified products list.

What to do with that. Establish your eligibility now and get your quotes now - both are useful and neither depends on the directory. But treat the £2,500 as pending rather than banked, and be wary of any installer who promises the grant as a firm discount today. If you would rather not wait, the cooling-only route is available immediately; it simply is not a grant job.

The accreditation is not interchangeable

Which installer accreditation you need follows directly from which branch you are on, and getting it wrong is a common, expensive trap:

• The grant-eligible air-to-air heat pump route needs an MCS-certified installer - that certification is what the grant requires. Our MCS glossary explains it.
• A pure cooling install that keeps your existing heating needs an F-Gas / REFCOM-registered engineer, not MCS. See the F-Gas / REFCOM glossary.

For the full scheme detail, our Boiler Upgrade Scheme glossary covers the eligibility conditions in one place.

Why the honesty matters here

This is a mis-selling-scarred category, and the honesty is not just principle - it protects you from a job that never qualified. Eligibility is per-property: it turns on your current heating, your willingness to replace it, and the installer's accreditation. Conservation-area status adds another layer, because it can change what you are allowed to fit outside: our records indicate 37.7% of top-floor flats in an inner-London borough like Islington sit inside a conservation area (as of July 2026, from planning.data.gov.uk and Historic England), where an external unit usually needs planning permission regardless of the grant. That is exactly the kind of thing worth checking against your specific address rather than a generic promise - which our complete guide to cooling a UK home sets in context.

How we work this out

Our grant logic follows the published Boiler Upgrade Scheme rules on gov.uk and the MCS and F-Gas / REFCOM accreditation requirements - no invented eligibility, and a clear "as of" date on every figure. You can read the full methodology and sources here.

Check your real eligibility

Our free cooling checker pre-fills your home from public property data (EPC and UPRN records) and gives you your real grant position on screen, straightaway - eligible or not, and why - alongside the right system, the planning position and a net cost. No phone call, and no cold-calling, ever.

Check your home in 60 seconds ▸

You will see your full cooling plan instantly. If you would like us to email it to you, or to have a single vetted local installer contact you about a free survey, you choose that at the end - we only get in touch if you ask us to.