Air to Air Heat Pump Grant in Cardiff

The grant position for a Cardiff homeowner

Because Cardiff sits in Wales, the £2,500 Boiler Upgrade Scheme (BUS) grant for an air-to-air heat pump applies here just as it does in England — it came into force across England and Wales on 28 April 2026 and runs to 2030. That is the flat residential rate for air-to-air specifically; the larger £7,500 figure you may have read about is for air-to-water systems that also make hot water. On top of the grant, installation carries 0% VAT until 31 March 2027.

The honest local snag is installer supply. MCS certification for air-to-air only began rolling out in 2026, and certified installers across South Glamorgan and the wider South Wales region are thin on the ground. The £2,500 is real money, but a CF-postcode household may wait for a genuinely MCS-certified fitter before it can be claimed. Check the detail on our eligibility page and current MCS installer guidance before committing.

Does an air-to-air heat pump suit a Cardiff home?

Cardiff's housing stock splits cleanly into two cases, and air-to-air answers each one differently.

The terraces: Cathays, Roath, Canton, Grangetown, Splott

Much of inner Cardiff — the CF24, CF11 and CF5 belts around the city centre — is dense Victorian and Edwardian terracing, a large share of it converted student HMOs and young-professional lets around Cathays and Roath. Nearly all of it runs on mains gas. For a gas-heated terrace, an air-to-air heat pump is broadly running-cost parity with a modern condensing boiler rather than a saving, so the real draw here is the summer cooling that these tight, west-facing brick fronts badly need, plus room-by-room control. If you are keeping a working gas boiler purely to add cooling, be clear: you will not qualify for the £2,500. The grant only applies where the heat pump is replacing your heating system.

Cardiff Bay and the CF10 flats

The waterfront regeneration around Cardiff Bay and the CF10 core is apartment-heavy — modern flats with electric or storage heating and, crucially, no space for a hot-water cylinder or an outdoor air-to-water unit. This is where air-to-air genuinely shines. It needs only a small wall-mounted indoor head and a compact external unit, it displaces expensive electric resistance heating, and for an all-electric flat the £2,500 grant is a real and appropriate route. Because air-to-air makes no hot water, a Bay flat keeps its existing immersion or instantaneous water heater — factor that into the sums on our cost page.

The off-gas fringe

Cardiff itself is overwhelmingly on the gas grid, so the classic off-gas oil/LPG case is less common inside the city than in the rural hinterland toward Pontypridd, Caerphilly or out past Barry. Where a fringe property in CF15 or CF23 is on oil or LPG, air-to-air replacing that heating is one of the strongest cases going — you swap an expensive off-gas fuel for a heat pump and take the grant with it.

Local funding: the council and Warm Homes Nest

Cardiff Council has a net-zero target of 2030 under its One Planet Cardiff strategy, one of the more ambitious dates among UK cities and aligned with Welsh Government's public-sector 2030 goal. Two Wales-specific things matter for funding:

• Warm Homes Nest — the Welsh Government's means-tested scheme for lower-income households. It sits alongside the £2,500 BUS grant, though in practice Nest tends to fund air-to-water systems rather than air-to-air.
• ECO Flex (via Cardiff Council) — a Welsh council can issue an ECO Flex referral that unlocks energy-supplier funding for eligible lower-income households, though ECO-funded heat pumps are air-to-water (which also make hot water), not air-to-air.

Neither replaces the BUS grant — they can stack with it depending on your circumstances. The full picture is on our grants and funding page.

Areas we cover around Cardiff

This guidance applies across the Cardiff postcode districts — CF3, CF5, CF10, CF11, CF14, CF15, CF23 and CF24 — taking in the city centre, Cardiff Bay, Cathays, Roath, Canton, Grangetown, Llanishen and Lisvane. We also cover the neighbouring commuter belt: Penarth, Barry, Caerphilly, Pontypridd and Newport, where the off-gas and mixed-fuel cases described above are more common than in the inner city.

What this means for the average Cardiff home

With the average Cardiff house price around £270,000 and a housing mix weighted toward gas-heated terraces, most owner-occupiers here are weighing air-to-air on comfort and cooling as much as on heating economics — the grant makes the switch cheaper, but the compelling all-electric case is concentrated in the Bay flats and the off-gas fringe. If you are on gas and staying on gas, this is not your grant. If you are on storage heaters, in an all-electric flat, or on oil/LPG at the city's edge, the £2,500 plus 0% VAT is worth acting on — supply of certified installers permitting.

Common objections and next steps

• "Isn't it £7,500?" Not for air-to-air — that's the air-to-water figure. Air-to-air is a flat £2,500.
• "Can I get it just for cooling?" No. If you keep a gas boiler for heating, you don't qualify. The pump must replace your heating.
• "Can I claim it now?" The grant is live in Wales, but you must use an MCS-certified air-to-air installer, and those are scarce across South Wales in 2026 — so it may not be readily claimable yet.
• "What about hot water?" Air-to-air makes none. Budget to keep your immersion or a separate water heater.

Start with our eligibility check, then read the real cost after the grant and how to find a genuinely certified fitter on our MCS installers page.