Heat pumps for Cardiff homes, from Pontcanna terraces to Cardiff Bay new-builds.
Thermal Earth has been installing heat pumps across Cardiff and South Wales since 2006 — air source, ground source and shared ground arrays, each one designed around the home it heats and installed by our own teams.
No EPC? Send an enquiry or call 01269 833100. We can check the evidence needed for your property.
Tell us what you're heating.
A three-bed semi in Whitchurch and a multi-home development need different things — but both start with understanding the building, the site and how you use heat.
Start with a free estimate.
Tell us a little about your home and your current heating, and you'll get a realistic starting figure in a couple of minutes. From there, a survey looks at heat loss, hot water, radiators and the best position for the unit.
Get my free estimatePlanning something bigger in Cardiff?
We work with self-builders, housing teams and developers across the city — individual systems, boreholes, or a shared ground array like the one we drilled for Cardiff Council at Brookfield Drive.
Discuss a Cardiff projectThree ways to heat a Cardiff home.
Which one fits depends on your house, your garden and your plans. That's what the survey settles — before any kit is chosen.
The everyday choice for terraces and semis.
A quiet outdoor unit suits most of Cardiff's housing, from Canton bay-fronts to Radyr new-builds. We plan the unit position, hot water and radiators together, so the whole system works as one.
For homes with garden space — and the city's schools.
Trenches or boreholes turn the ground itself into your heat source. Our Cardiff work includes St Nicholas School and the Cardiff Living housing development on the former Eastern High School site. The Eastern High scheme serves 170 homes, rather than a working school.
One array, a street's worth of homes.
At development scale, a shared borehole array can serve many individually controlled heat pumps — each home with its own system and its own thermostat. It's the approach behind Cardiff Living at Brookfield Drive.
A Cardiff street heated from five boreholes.
For Cardiff Council's Cardiff Living programme, we drilled five boreholes to 150m and installed 13 individually controlled ground-source systems for 13 homes at Brookfield Drive.
Read the Brookfield storyboreholes
deep, drilled by our own rigs
individually controlled heat-pump systems
at Brookfield Drive
Warmth for 44 community-living apartments.
Five ground-source heat pumps, fed by fourteen boreholes drilled to 180m, provide heating and hot water for this council community-living scheme.
- 44
- council-rent apartments
- 5
- ground-source heat pumps
- 14 x 180m
- boreholes
From first look to a warm home.
Four steps, one team. Surveyors, system designers, drillers and installers all work for Thermal Earth — nothing gets lost between contractors.
We get to know your home.
Room-by-room heat loss, hot water use, radiators, electrics and where the unit or boreholes could go.
Your system, sized properly.
Heat pump, emitters, hot-water cylinder and controls chosen together — so it heats well on the coldest week of the year, not just on paper.
Our own crews do the work.
Drilling, pipework, electrics and commissioning — coordinated by us, and we tidy up after ourselves.
We stay on hand.
Annual servicing and remote monitoring through our Comfort Care plan, if you'd like us to keep an eye on things.
Things Cardiff homeowners ask us.
Every home is a little different — these are the honest starting points.
Air source or ground source for my house?
For most Cardiff homes with limited garden space, air source is the natural fit. Ground source comes into its own where there's land — or at development scale. The survey tells us which, not the brochure.
Do I need planning permission?
Usually not — most heat pump installations fall under permitted development. Listed buildings and conservation areas, like parts of Pontcanna and Llandaff, can need consent. We check the planning position for every job as part of the survey.
Can I keep my existing radiators?
Often, yes. Heat pumps run at lower temperatures than gas boilers, so we measure whether your radiators are large enough. Some homes retain their radiators; others need upgrades. The room-by-room assessment establishes what is needed.
What grant help is available?
You may qualify for the Boiler Upgrade Scheme, and we handle the application for you. Our scheme guide and the Ofgem guidance have the current amounts and eligibility.
Eligible air-to-water or ground-source heat pump installations receive £7,500. If your property has no mains gas connection and you are replacing oil or LPG heating, the grant is £9,000 for applications properly made from 21 July 2026 to 31 March 2027. We check eligibility for your home.
Where are you based?
Ammanford, in Carmarthenshire — about an hour west along the M4. Cardiff has been part of our patch since 2006, from single homes to council developments.
Across Cardiff and the Vale.
Pontcanna, Canton, Whitchurch, Llandaff, Roath, Cathays, Penylan, Cyncoed, Radyr and St Fagans — plus Penarth, Barry, Caerphilly and the Vale of Glamorgan.
City centre or surrounding village, if you're in the greater Cardiff area you're covered. See everywhere we work.
Ready to see what a heat pump could do for your Cardiff home?
Get a free estimate online in a couple of minutes — or if you're planning a development, bring us the site and we'll talk it through.