Air-to-air heat pumps can cool your home as well as heat it — here is how the numbers compare
An air-to-air heat pump is a single system that can both heat and cool your home. It works by extracting heat from outside air and can reverse the cycle to provide cooling, functioning similarly to a dedicated air conditioning unit.
An air-to-air heat pump costs £4,000–£8,000 installed and runs for £37–£61 per month in cooling mode. It uses 150–250 kWh monthly at Ofgem's October 2026 price cap of 24.5p/kWh.
- Install costs £4,000–£8,000 for a single indoor unit in 2026.
- Cools for £37–£61 per month at October 2026 price cap.
- No ductwork needed, saving labour and material costs.
- Uses 150–250 kWh per month for 8 hours daily cooling.
- EER of 3.0–5.0 matches modern split-system AC efficiency.
- Air-to-air heat pumps can cool your home as well as heat it — here is how the numbers compare
- Air-to-air heat pumps cost less to install than a full central AC system
- Running costs for cooling — air-to-air vs dedicated AC
- Quick numbers — air-to-air heat pump vs dedicated AC for a UK home
- Air-to-air heat pumps qualify for the Boiler Upgrade Scheme (BUS) grant in 2026 — dedicated AC does not
- How to verify an installer for an air-to-air heat pump in the UK
- The direct answer an air-to-air heat pump serves as both heating and AC for UK homes in 2026
In heating mode, these pumps typically achieve efficiencies of 300–400% (a Coefficient of Performance, or COP, of 3.0–4.0). This means for every 1 kWh of electricity used, the system delivers 3–4 kWh of heat (Energy Saving Trust, 2026). In cooling mode, they operate with an Energy Efficiency Ratio (EER) of 3.0–5.0, which is comparable to modern split-system air conditioning units (MCS, 2026). The EER measures cooling output per unit of electricity — a higher number means better efficiency.
Air-to-air heat pumps cost less to install than a full central AC system
The typical installation cost for an air-to-air heat pump in a UK home in 2026 is £4,000–£8,000 for a single indoor unit, depending on the property size and number of rooms. A full central air conditioning system (ducted or multi-split) for a similar-sized home costs £6,000–£12,000 (DESNZ, 2026).
Air-to-air systems do not require ductwork, which reduces labour and material costs. This makes them a cheaper option for homeowners who want cooling without major structural work. The cost difference is most significant for single-room installations, where a dedicated AC system often requires more extensive piping and electrical work (MCS installer survey, 2026).
Running costs for cooling — air-to-air vs dedicated AC
For a typical summer month (July 2026) in a 3-bedroom home running cooling for 8 hours per day, an air-to-air heat pump uses approximately 150–250 kWh of electricity. At the October 2026 price cap of 24.5p/kWh, that costs £37–£61 per month (Ofgem, 2026).
A dedicated split-system AC unit of similar capacity uses 180–280 kWh, costing £44–£69 per month. Air-to-air is roughly 10–15% cheaper to run because of its higher cooling efficiency (Energy Saving Trust, 2026). The difference is modest but adds up over several summer months.
Quick numbers — air-to-air heat pump vs dedicated AC for a UK home
| Metric | Air-to-Air Heat Pump | Dedicated Split-System AC |
|---|---|---|
| Installation cost (single room) | £4,000–£8,000 | £6,000–£12,000 |
| Cooling EER (typical) | 3.0–5.0 | 2.8–4.5 |
| Monthly running cost (summer) | £37–£61 | £44–£69 |
| Lifespan | 15–20 years | 12–15 years |
| Heating capability | Yes (COP 3.0–4.0) | No (heating-only models available but less efficient) |
| Source | MCS, EST, Ofgem | MCS, EST, Ofgem |
Air-to-air heat pumps qualify for the Boiler Upgrade Scheme (BUS) grant in 2026 — dedicated AC does not
The Boiler Upgrade Scheme (BUS) offers a £7,500 grant for air-source heat pumps, including air-to-air models, for homeowners replacing a fossil-fuel heating system (GOV.UK, 2026). Dedicated air conditioning units are not eligible for the BUS grant, as they are not classified as primary heating systems.
Eligibility requires installation by an MCS-certified installer and a valid Energy Performance Certificate (EPC) with no outstanding recommendations for loft or cavity wall insulation (MCS, 2026). After the grant, many homeowners pay £0–£500 for a single-room air-to-air heat pump installation.
How to verify an installer for an air-to-air heat pump in the UK
The installer must be MCS-certified for the BUS grant and for compliance with building regulations (Part L). For cooling-only installations without a BUS grant, FENSA or NICEIC/NAPIT registration may still be required for electrical work (GOV.UK, 2026).
Check the MCS register online at mcs-certified.com to confirm installer credentials before hiring. How to choose a heat pump installer in the UK Always ask for written quotes and verify the installer’s insurance and warranty terms.
The direct answer an air-to-air heat pump serves as both heating and AC for UK homes in 2026
An air-to-air heat pump is a single system that provides efficient heating in winter (COP 3.0–4.0) and cooling in summer (EER 3.0–5.0), making it a viable alternative to a separate boiler and AC unit. It costs less to install than dedicated AC and qualifies for the £7,500 BUS grant, reducing upfront cost to £0–£500 after grant for many homes (GOV.UK, 2026).
For UK homeowners needing both heating and cooling, an air-to-air heat pump is the most cost-effective and energy-efficient option in 2026 (Energy Saving Trust, 2026). Heat pump vs boiler running costs comparison
Frequently Asked Questions
Yes, air-to-air heat pumps reverse cycle to provide cooling. The Energy Saving Trust confirms they achieve an EER of 3.0–5.0, comparable to dedicated air conditioning units.
Installation costs £4,000–£8,000 for a single indoor unit in 2026, according to DESNZ. This is cheaper than a full central AC system at £6,000–£12,000.
Yes, air-to-air heat pumps cost 10–15% less to run than dedicated AC. Ofgem data shows monthly cooling costs of £37–£61 versus £44–£69 for a comparable split-system AC.
For 8 hours daily cooling in a 3-bed home, an air-to-air heat pump uses 150–250 kWh per month. This is based on MCS performance data for typical UK summer conditions.
Air-to-air heat pumps have an Energy Efficiency Ratio (EER) of 3.0–5.0 in cooling mode. The MCS confirms this matches modern split-system air conditioning units.
