Does a bedroom-only unit qualify for the £2,500 grant?
A bedroom-only pump does not qualify for the £2,500 grant, because Ofgem requires the heat pump to cover 100% of the property’s space heating (§3.80, checked 25 Sep 2026). Class G can still cover one reversible unit on the rear wall if it is not used only for cooling.
computed
Worked case from the decision engine
Result on the facts named above: permitted development.
Same rear-wall facts as the terraced worked case give permitted development. The same facts with use set to cooling only give not covered by this class (G.3(aa)). The grant call with whole-home heating set to no returns no.
Volume, noise and listing in the worked case are entered facts. They are not read off the postcode.
Cooling paths
At 400 hours and the Ofgem cap, the split scenario is £27.71 and the portable scenario delivering the same 2.5 kW is £101.23.
| Path | What it is | Up front | £ for 400 h | Open |
|---|---|---|---|---|
| External shading | No outdoor unit | Shelf prices sit in the shade class of the retail file | No compressor draw in the catalogue | /tools/sizing/ |
| Fan | Devola Low Noise 20W 9 Speed 9-inch DC Desk Fan - White - DVF7DCFAN | £59.95 | £2.11 for 400 h at 20 W | /tools/running-cost/ |
| Portable | Cirro® 12000 BTU Super Quiet Smart Portable Air Conditioner - Cooling | £519.99 | £101.23 to deliver 2.5 kW for 400 h at EER 2.6 | /tools/running-cost/ |
| Split / air-to-air | Daikin Perfera 2.5 kW, SEER 9.5 | median shelf £1,027.49 (n=14) | £27.71 for 400 h | /tools/payback/ |
The clauses this situation turns on
ENG-12 · G.3(aa), inserted by SI 2025/560 art. 5(4)(b) · checked 25 Sep 2026. the air source heat pump is not solely used for the purpose of cooling Source
ENG-03 · G.2(a), as substituted by SI 2025/560 art. 5(3)(a) · checked 25 Sep 2026. the development would result in the presence of (i) more than one air source heat pump on, or within the curtilage of—(aa) a dwellinghouse which is not a detached dwellinghouse; (bb) a block of flats; (ii) more than two air source heat pumps on, or within the curtilage of, a detached dwellinghouse Source
Next pages
· · n= · · updated 25 Sep 2026 · version 1.0.0 · CSV of the values on this page