Air to Air Heat Pump Cost: Prices, the £2,500 Grant and Honest Payback
What does an air-to-air heat pump cost in 2026?
If you are pricing an air-to-air heat pump — the reversible, air-conditioning-style kit that heats in winter and cools in summer — the honest headline is a wide range. "One unit in one room" and "a ducted system for a whole house" are very different jobs, so beware anyone who quotes a single tidy figure. As at July 2026, and with the 0% VAT rate already baked in, a fair spread looks like this.
| System | What it covers | Typical installed cost (0% VAT) |
|---|---|---|
| Single-split | One room or open-plan area, one indoor head | £1,200-£3,000 |
| Multi-split (2 rooms) | Two indoor heads off one outdoor unit | £2,800-£4,500 |
| Multi-split (3-4 rooms) | Three to four heads, most of a flat or small house | £3,500-£7,000 |
| Ducted | Whole-home heating and cooling via concealed ductwork | £6,000-£15,000 |
The government's own guidance puts a typical flat or small house at around £4,500 (gov.uk, as at July 2026). Where you land inside these bands depends on how many rooms you heat, how easy the pipe runs and cabling are, whether you need scaffolding for the outdoor unit, and the brand of kit. A straightforward single-split into a flat with the outdoor unit on a nearby balcony is at the cheap end; a multi-head system threaded through a period house with awkward access is not.
The 0% VAT rate is already in those prices
Since the figures above include 0% VAT, it is worth being clear about what that rate is and is not. The zero rate applies UK-wide to the supply and installation of a permanently-fixed air-to-air unit that provides heating, under HMRC's energy-saving materials rules (VAT Notice 708/6, as at July 2026). It is a price cut on the whole job, not a grant you claim back. A cooling-only unit — one installed purely for air conditioning with no heating function — does not qualify, so the heating capability matters both for the VAT relief and, as we will see, for the grant.
The £2,500 grant, and what you actually pay
Air-to-air heat pumps became eligible for the Boiler Upgrade Scheme at a flat £2,500 grant on 28 April 2026 (SI 2026/390, as at July 2026). This covers residential properties in England and Wales, and the scheme runs to 2030. It is the first time UK government money has been available for air-conditioning-style heating.
Two things about the money mechanics matter for your budget. First, it is £2,500, flat — not the £7,500 you may have seen quoted, which is for air-to-water and ground-source pumps only. Second, you never handle the cash. Your MCS-certified installer applies on your behalf and deducts the £2,500 directly from the quote, so it comes off the price upfront. There is one grant per property.
Put the grant against the installed cost and the net picture, as at July 2026, looks like this:
| System | Installed cost (0% VAT) | Net after £2,500 grant |
|---|---|---|
| Single-split | £1,200-£3,000 | £0-£500 (grant can cover a small single-split in full) |
| Multi-split (2 rooms) | £2,800-£4,500 | £300-£2,000 |
| Multi-split (3-4 rooms) | £3,500-£7,000 | £1,000-£4,500 |
| Ducted | £6,000-£15,000 | £3,500-£12,500 |
So the £2,500 goes a long way on a modest job and is a useful chunk off a larger one. On a single small unit it can, in some cases, cover the lot.
The catch nobody else is telling you about
Here is the part most cost pages leave out, and it is the honest reason not to bank on the net figure yet. The grant is law, but MCS certification for air-to-air installers is still rolling out through 2026. Certification bodies are still gaining the UKAS accreditation needed to certify air-to-air installers, the installer's technical supervisor needs an RACHP Level 3 qualification, and MCS has given no fixed completion date, describing timescales as varying (MCS, as at July 2026).
The practical effect: MCS-certified air-to-air installers are genuinely scarce in mid-2026, and no MCS-certified job means no grant and no £2,500 off. You can still buy an air-to-air system today from any competent installer — you will get the 0% VAT — but if the grant is central to your budget, check that your installer holds current MCS certification for air-to-air specifically before you sign. Plenty will not have it yet. We would rather you knew that now than found out after the quote.
Running cost: what a unit of heat actually cost this summer
The purchase price is only half the question. What makes air-to-air interesting is the running cost, because a heat pump delivers three to four units of heat for every unit of electricity it draws. The fair way to compare fuels is the cost of one delivered kilowatt-hour of heat — after efficiency losses — rather than the headline pence-per-unit on your bill.
Using the Ofgem price cap for 1 July to 30 September 2026 (electricity 26.11p/kWh, gas 7.33p/kWh; Ofgem, as at July 2026), and a mid-range air-to-air seasonal efficiency of SCOP 4.0, delivered heat compares like this:
| Heating type | Cost of delivered heat (p/kWh) | Basis |
|---|---|---|
| Air-to-air (SCOP 4.0) | ~6.5p | 26.11p ÷ 4.0 |
| Mains gas boiler | ~8.1p | 7.33p ÷ ~90% efficiency |
| Heating oil | ~8.5-10.5p | price varies through the year |
| LPG | ~12-15p | bulk tank supply |
| Storage heaters (Economy 7) | ~15p | cheap night units, but no heat-pump multiplier |
| Direct electric (panel/fan) | ~26p | 26.11p, no efficiency gain |
Read down that column and the pattern is clear. Air-to-air undercuts everything, but by wildly different margins depending on what you are replacing. Against direct electric or storage heaters it is transformational. Against mains gas it is roughly line-ball. That difference decides whether the sums work for you.
Payback by what you currently heat with
This is the table to make your decision on. It pairs the running-cost gap above with the net purchase price after the grant, so you can see, honestly, how long the kit takes to pay for itself — and where it simply does not.
| You currently heat with | Rough annual saving | Payback after £2,500 grant | Verdict |
|---|---|---|---|
| Storage heaters / direct electric | £500-£900+ per year | Under 2 years | Strongest case — the flagship fit |
| LPG | Substantial | 2-4 years | Very good |
| Heating oil | Modest | ~10 years | Weak on cash alone — consider air-to-water instead |
| Mains gas | Roughly line-ball | No clear cash payback | Buy for cooling and low install cost, not to beat gas |
If you heat an all-electric home or flat with storage heaters or panel heaters, air-to-air is the obvious upgrade: the running-cost drop is large and the net cost after grant is small, so payback commonly comes inside two years. The storage-heater saving is real but let us keep it honest — roughly £500-£900 a year for a typical home, not the outsized percentages some adverts imply. Storage heaters already run on cheap Economy 7 night units, so the gap is narrower than raw pence-per-kWh suggests, but it is still firmly in your favour.
On LPG the case is nearly as good. On heating oil the running-cost gap is thin, so a roughly ten-year payback means you should really be weighing air-to-water instead, which can claim the larger £7,500 grant. On mains gas, air-to-air will not save you money on heating — buy it because you also want summer cooling and a low install cost, not as a bill-cutter.
Why the timing matters for cost
One genuine deadline affects the price, and it is not the grant. The 0% VAT rate on air-to-air runs to 31 March 2027, after which it reverts to 5% rather than the full 20% (VAT Notice 708/6, as at July 2026). On a £4,500 job, the difference between 0% and 5% is around £225 — worth having, but not a reason to rush a poor decision.
The grant itself is not on a countdown — the Boiler Upgrade Scheme runs to 2030. So there is no fake urgency here. The one date to keep in view is the VAT change in spring 2027; the grant will still be there after it. If anything, the sensible reason to wait is the opposite: as more installers gain MCS air-to-air certification through 2026 and into 2027, the £2,500 becomes easier to actually claim.
The honest downsides that affect your budget
Two costs do not show up in the headline price and you should plan for them.
First, air-to-air makes no domestic hot water — that is inherent to the technology, not a fault of any particular unit. It heats and cools the air, and nothing else. So you keep a separate way to heat water: an immersion heater, a hot-water cylinder, or a small hot-water heat pump. If you were hoping one box would do heating and hot water, air-to-water is the system that does that, not this one. Factor the running cost of your existing water heating into the comparison.
Second, efficiency dips in a cold snap. The SCOP 4.0 figure is a seasonal average; when the outside temperature falls below about -5°C the coefficient of performance can drop to roughly 2 to 2.5, so on the coldest days the unit works harder and costs more to run than the annual average implies. For most of the UK heating season that is a handful of days, but it is real and worth knowing before you rely on air-to-air as your only heat source.
Working out your own number
To turn these ranges into a figure for your home, three things settle it: how many rooms you want to heat (which sets the tier and price band), what you heat with today (which sets the payback), and whether you can find an MCS-certified air-to-air installer to unlock the £2,500. Get the first two straight yourself, then let us match you to an installer who genuinely holds air-to-air certification — because a cheaper quote from an uncertified fitter costs you the grant, and that is rarely the bargain it looks like.
Find an MCS-certified air-to-air installer
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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.
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No obligation and no pushy calls. If air-to-air isn’t right for your home, we’ll tell you straight.