Grant rules checked against Ofgem on 15 October 2026
Air source heat pump pros and cons
Published and last updated 15 October 2026
The main advantages of an air source heat pump are low-carbon heating, a £7,500 grant and potentially lower running costs; the main disadvantages are a higher upfront price, space for a cylinder and outdoor unit, and possible radiator upgrades.
Pros
- £7,500 grant and 0% VAT
- Low-carbon heating
- Heating and hot water from one system
- No fuel deliveries for oil and LPG homes
- Steady, even warmth
- Can last many years with servicing
Cons
- Higher upfront cost than a boiler
- Needs outdoor space
- Needs a hot water cylinder
- Some radiators may need upsizing
- Running costs depend on design and tariff
- The outdoor unit makes some noise
What are the biggest advantages?
The biggest advantages are the grant, which can cover much of the cost, and switching to low-carbon heating without fuel deliveries.
What are the main disadvantages?
The main disadvantages are the space a heat pump needs and the upfront work, such as a cylinder and larger radiators.
Are the disadvantages deal-breakers?
Usually not: most can be designed around during the survey, which is why getting a proper heat loss assessment matters.
Choosing an MCS-certified installer
Are heat pumps noisy?
Modern outdoor units make a low hum while running and must meet noise limits to be installed without planning permission.
Planning permission and noise rules
Who is a heat pump not right for?
A heat pump may not suit homes with no outdoor space, nowhere for a cylinder, or very high heat loss that can't be reduced.
Frequently asked questions
What do people regret about heat pumps?
Most regrets come from poor design: undersized radiators or a unit that's the wrong size, which a good heat loss survey avoids.
Do heat pumps work in old houses?
Yes, if the system is designed around the home's heat loss. Is your home suitable for a heat pump?