Ambient heat: Impact on nature

Clean at the source; the electricity and refrigerants matter

What this tab covers What taking energy from this source does to land, water, air and climate, wildlife and ecosystems, with life-cycle emissions and land use where measured.

Extracting ambient heat has almost no direct effect on nature; the impacts come from the electricity used and from refrigerant leaks. Even on fossil-heavy grids, heat pumps usually cut emissions compared with boilers.

Effects on nature

Area	Effect	Size	How it is reduced
Climate (electricity)	Emissions depend on the power mix driving the compressor.⁵	At least 20% lower than a gas boiler even on emissions-intensive power; up to 80% lower on cleaner grids	Low-carbon electricity, better insulation
Climate (global picture)	Life-cycle comparison across world regions.¹¹	Electric cars and heat pumps are less emission-intensive than fossil alternatives in 53 of 59 regions, which make up 95% of global transport and heating demand	Decarbonise the remaining coal-heavy grids
Refrigerants	Many units use fluorinated gases (HFCs) that are strong greenhouse gases if they leak.¹²	EU bans F-gases with GWP above 150 in self-contained (including monobloc) heat pumps up to 50 kW from 2027 and all F-gases in small monobloc units (under 12 kW) from 2032; HFC consumption fully phased out by 2050	Low-GWP and natural refrigerants (such as hydrocarbons), leak checks, recovery at end of life
Land and ground	Ground loops need trenches or boreholes; vertical loops use less land.³	Horizontal trenches at least about 1.2 m (4 ft) deep; lake coils at least 2.4 m (8 ft) down	Vertical boreholes in dense areas
Energy system	Replaces combustion in buildings, removing local air pollution and fuel imports.⁹	Europe's installed base avoids about 21 billion m3 of gas imports

The ambient heat itself is free of emissions; what matters is the electricity that drives the pump and the refrigerant inside it. Because a heat pump delivers two to four units of heat for each unit of electricity, it beats a gas boiler on emissions in most of the world even before the grid is decarbonised. A meaningful single g CO2e/kWh figure does not exist, since it depends on the local power mix and climate.

Refrigerant leakage is the main direct hazard, and EU regulation is moving equipment towards low-GWP and natural refrigerants. Ground-source systems disturb soil during installation but leave little lasting footprint once the loops are buried.

Sources

Guide to Geothermal Heat Pumps US Department of Energy
The Future of Heat Pumps: Executive summary IEA, 2022
European Heat Pump Market and Statistics Report 2025: Executive summary European Heat Pump Association, 2025
Net emission reductions from electric cars and heat pumps in 59 world regions over time (Knobloch et al., Nature Sustainability) Nature Research, 2020
Final Adoption of the Revised European F-gas Regulation Heat Pumping Technologies (IEA TCP), 2024