MCS-Certified Air-to-Air Heat Pump Installers: What to Check Before You Sign
The short version
If you are chasing the £2,500 air-to-air heat pump grant, the installer you choose decides whether you get paid. The Boiler Upgrade Scheme (BUS) releases the grant only when the installation is done by an MCS-certified installer using an MCS-certified product — and only when that installer holds MCS certification with air-to-air scope specifically. As at July 2026 that scope is still being rolled out, so genuinely certified air-to-air installers are scarce. Verify certification before you sign anything, not after.
Why MCS certification is the whole ballgame
The rule is blunt, and it is worth stating plainly before you spend a penny. No MCS-certified air-to-air installation means no £2,500 grant. There is no discretion, no appeal and no retrospective fix. The Boiler Upgrade Scheme pays the grant to your installer, who deducts it from your quote upfront, but Ofgem only honours that payment when the job meets the MCS standard. If your fitter is not MCS-certified for air-to-air, the money simply is not there — however good their work.
Air-to-air heat pumps became eligible for BUS at a flat £2,500 for residential properties in England and Wales from 28 April 2026 (as at July 2026), and the scheme runs to 2030. That eligibility is set in law. What is not automatic is the supply of installers allowed to deliver it. You can read the grant rules on gov.uk; the certification side is governed separately by MCS.
The catch nobody advertises: air-to-air certification is still rolling out
Here is the part most installer websites leave out, Andrew. The grant is live, but MCS certification for air-to-air is not yet widespread. Air-to-air was only recently brought into scope, and the certification machinery is still catching up as at July 2026.
Three things are happening behind the scenes. Certification bodies are still gaining UKAS accreditation to certify air-to-air installers, so not every certification body can yet sign firms off. The installer's Technical Supervisor needs the relevant refrigeration competence — RACHP Level 3 — because an air-to-air unit is essentially reversible split air-conditioning hardware handling refrigerant. And the work is assessed against the MCS installation standards (MCS 007 for the product, MIS 3005-D and MIS 3005-I for design and installation, under the MCS 031 umbrella scheme rules). MCS itself has given no fixed completion date, describing timescales as varying.
The practical result: an installer can be MCS-certified for air-to-water and still not hold air-to-air scope. A company can be a superb air-conditioning firm with decades of experience and still be unable to unlock your grant, because MCS air-to-air scope is a specific accreditation, not a general reputation. This is exactly why you must check — the scarcity is real, and a confident sales pitch is not the same as a certificate.
Exactly what to check before you sign
You do not need to take anyone's word for any of this, and you should not. Every item below is something you can verify yourself in a few minutes, before money changes hands. If an installer resists any of these checks, treat that as your answer.
- Verify the MCS certification, with air-to-air scope. Ask for the company's MCS certificate number, then confirm it independently on mcscertified.com. Certification alone is not enough — check that the technology scope explicitly lists air-to-air (air source heat pump — air to air). Air-to-water scope does not cover your installation.
- Confirm the product is MCS-listed. The specific unit being fitted must appear on the MCS product database. A certified installer fitting a non-certified unit still voids the grant, so ask which make and model, and check it.
- Check F-Gas registration. Air-to-air units contain refrigerant (R32 now, R290 for new small splits from 1 January 2027), so the company must be F-Gas certified to handle it legally. This is separate from MCS, and both are required.
- Get a written quote showing the grant deducted. The £2,500 (as at July 2026) should appear on the quotation as an upfront deduction, not a vague promise to "sort the grant later". The installer applies to Ofgem on your behalf and the air-to-air voucher is redeemed within three months, so the paperwork should be concrete from the start.
- Confirm you actually qualify. The grant requires replacing an existing fossil-fuel or electric heating system (gov.uk lists oil, gas, electric or LPG), not bolting a heat pump alongside a boiler you intend to keep. If an installer glosses over eligibility to close the sale, be cautious.
MCS-certified air-to-air installer vs a general air-con fitter
| What matters | MCS-certified (air-to-air scope) | General air-con / electrician |
|---|---|---|
| Unlocks the £2,500 BUS grant | Yes | No |
| Listed and verifiable on mcscertified.com | Yes | No |
| Product must be MCS-listed | Yes, checked | Not required by them |
| F-Gas registered | Required — verify | Often, but verify |
| Applies to Ofgem for your grant | Yes | Cannot |
A general air-con firm may fit a perfectly good unit — but if the grant matters to you, only an MCS-certified air-to-air installer can deliver it. As at July 2026, that narrows the field considerably.
"My local company says they can do it"
They may well be able to fit the hardware to a high standard. The question is narrower than competence: does the specific company hold current MCS certification with air-to-air scope on the day they do your job? Reassurances such as "we're getting certified", "we work with an MCS company", or "we'll handle the grant" are not certification. Only a live listing on mcscertified.com in that company's own name, showing air-to-air scope, is. If they are mid-way through accreditation, you are welcome to wait for them — but do not sign or pay on the promise of a certificate that does not yet exist.
Your next step
Because certified air-to-air installers are still thin on the ground as at July 2026, the sensible order is simple: confirm you qualify, then find a verified MCS air-to-air installer, then get the written grant-deducted quote — in that sequence. We connect genuinely-eligible homeowners with MCS-certified air-to-air installers; we do not sell a brand of kit, and we will tell you plainly if the grant is not yet claimable in your area. If you are in Scotland or Northern Ireland, note there is no BUS grant there at all — you would rely on 0% VAT only (HMRC VAT Notice 708/6, as at July 2026).
Find an MCS-certified air-to-air installer
We aim to reply within one working day
Tell us a little about your home and we’ll help you find a genuinely MCS-certified air-to-air installer — the only kind who can secure your £2,500 grant. We’re an independent guide, not an installer, and we don’t sell kit.
- 1. Tell us your situation — your postcode and what you heat with now.
- 2. We sense-check the grant and point you to MCS-certified air-to-air installers near you.
- 3. You get honest quotes — no obligation, and no pushy calls.
- Independent guide
- gov.uk-sourced facts
- MCS installers only
- No obligation
No obligation and no pushy calls. If air-to-air isn’t right for your home, we’ll tell you straight.