Ground source vs air source heat pumps for new build developments

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Which low-carbon heating strategy is best for your development?

Low-carbon heating solutions are not a new concept, with heat pumps being an established technology that are becoming a central part of the UK’s low-carbon heating transition in line with the Future Homes Standard (FHS).

Two of the most widely adopted heat pump technologies are ground source heat pumps (GSHPs) and air source heat pumps (ASHPs). Both can support the transition away from gas heating, but the most suitable solution often depends on the scale, density and long-term infrastructure strategy of the development.

This guide compares ground source vs air source heat pumps for housing developments and explores how developers can assess the right heating strategy for future-ready residential schemes.

What are ground source and air source heat pumps?

Ground Source Heat Pumps (GSHPs)

Ground source heat pumps use underground pipework to extract naturally stored heat from the earth. Because underground temperatures remain relatively stable throughout the year, GSHPs provide highly efficient and consistent heating and hot water. They reduce emissions by up to 90% compared to traditional gas boilers.

Air Source Heat Pumps (ASHPs)

Air source heat pumps extract heat from the outside air and transfers it to heating and hot water within a dwelling using electricity. It typically operates as individual systems installed on each property and they reduce emissions by around 70%.

Both technologies support low-carbon housing delivery and help developers move away from fossil fuel heating systems.

Ground source vs air source heat pumps: developer comparison

Consideration	Ground Source Heat Pumps (GSHPs)	Air Source Heat Pumps (ASHPs)
Best suited for	Small, medium and large developments, apartments, mixed-use schemes	Smaller or lower-density housing developments
Infrastructure approach	Centralised systems and individual heat network infrastructure	Individual property systems
Grid constraints	Lowest grid impact, unlocking grid constrained sites	Require more grid capacity per unit
Efficiency consistency	Stable year-round ground temperatures support consistent performance	Performance can fluctuate with outdoor temperatures
External space requirements	No external plant required	External units required at each home
Internal space requirements	For centralised systems, a Heat Interface Unit the same size as a gas boiler. For decentralised systems, a storage tank similar size to a fridge freezer	A storage tank similar size to a fridge freezer and an interface unit
Aesthetic impact	No visible external equipment	Outdoor condensers visible
Scalability	Well suited to phased or expanding developments	More suited to small scale infrastructure
Maintenance model	Centralised infrastructure has a long life, is low-maintenance and the cost is predictable	Individual systems have a shorter life and higher maintenance but offer accessibility and low complexity servicing
Apartment suitability	Highly suitable for high-density developments	Individual units at each dwelling can be impractical at scale

Ground source vs air source heat pumps: homeowner comparison

Heating infrastructure increasingly affects homeowner experience as well as development performance.

Consideration	Ground source heat pumps (GSHPs)	Air source heat pumps (ASHPs)
Resident noise impact	Quiet operation with no outdoor fan units	External fan units generate operational noise
Heating performance	Consistent year-round performance due to stable geothermal temperatures	Works harder during winter months when the ambient air temperature is lower
Maintenance costs	Annual service of internal unit 15-20 year life span	Annual service of internal and external equipment 15-20 year life span
Bills	Provided by the network owner, fixed fee for decentralised systems and a standing charge for centralised systems	Dependant on electric tariffs

Choosing the best heat pump strategy for housing developments

As a result of the Future Homes Standard, heating strategy is becoming an early-stage development consideration. However, there is no one-size-fits-all solution.

While both GSHPs and ASHPs can support Future Homes Standard compliance, ground source heat networks often become more advantageous as development scale, density and complexity increases.

By planning low-carbon heating infrastructure early, developers can reduce coordination challenges during construction and create more resilient long-term energy strategies.