In Swansea, Carmarthenshire the average household spends £751 a year on heating — 22% lower than the UK average of £960. Typical homes are 86.0 m² with 4.7 rooms. The local population is around 45,893 residents (Census 2021). Switching to an air-source heat pump could save up to £300 a year for an average home after the £7,500 Boiler Upgrade Scheme grant.


Areas covered

Blue Anchor, Gorseinon, Gowerton, Hendy, (Carmarthenshire), Loughor, North Gower, Penllergaer, Penclawdd, Pontarddulais, Three Crosses

See more in the SA area hub.

Typical air-source heat-pump installation costs range from about £6,000 at the low end to roughly £18,000 at the high end. Most homes fall somewhere between £7,000 and £15,000. These prices are before the £7,500 BUS grant (in addition, qualifying rural and island homes in Scotland may receive a further £1,500 uplift under the Home Energy Scotland scheme, for up to £9 000 of grant funding).

Installation costs in Swansea, Carmarthenshire are broadly in line with the UK average.

CategoryNational cost range Adjusted for SA4 (×0.96) Net after £7,500 BUS grant
Small flats / simple installs £ 6,000 – £ 7,000 £ 5,760 – £ 6,720 from ~£ 1,000*
2–3-bed semis / moderate upgrades £ 8,000 – £ 12,000 £ 7,680 – £ 11,520 from ~£ 1,000*
Large detached / extensive work £ 13,000 – £ 18,000 £ 12,480 – £ 17,280 £ 4,980 – £ 9,780

* Minimum net costs rarely fall below £1,000 after grant, since most installs incur at least minor extra work.

Lower end
  • Minimal groundwork or plumbing modification required
  • Well-insulated homes that only need a compact ASHP unit
Mid end
  • Moderate radiator or underfloor-heating upgrades
  • Typical pump size (8–12 kW)
Upper end
  • Large detached houses or older properties needing major pipework
  • Extensive insulation or radiator replacement
  • Multi-zone controls and bespoke system design

Heat pump FAQs

How much does a heat pump cost here?

About £2,740 for a typical 3-bedroom home after the £7,500 grant.

How much can I save on heating bills?

Roughly £300 per year for the average home at current price-cap rates.

  • £751 Average Heating Cost UK avg £960
  • 86.0 m² Median Floor Area UK avg 84.7 m²
  • 4.7 Average Rooms UK avg 4.4

Local energy snapshot

Latest tariff window: 2025Q4

Ofgem region & price cap

South Wales · 26.83p/kWh · 51.69p/day

PV potential (south-facing)

961 kWh per kWp/year

Dwelling mix

House 76.4% Flat 12.5% Bungalow 10.1% Detached 33.1% Semi-detached 42.2% Terraced 22.9%

EPC certificates

10,010 on record

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Also in Your Area: Solar Panel Potential

Heat pumps increase electricity usage. Solar panels can offset your higher bills.

Without heat pump:

Solar saves ~£804/year
Payback: 12.7 years

With heat pump:

Solar saves ~£966/year
Payback: 10.6 years

  • Typical system 5 kW
  • Installation cost ~£10,200
  • Annual generation 4,806 kWh

See detailed solar data for SA4 →

Data from our sister site, Solar By Postcode UK

Compare nearby areas: SA1 (Swansea, Neath Port Talbot) · SA2 (Swansea) · SA3 (Swansea) · SA5 (Swansea) · SA6 (Swansea) · SA7 (Swansea, Neath Port Talbot)

Heat Pump Installation & Ownership Guide

Timeline, planning rules, maintenance and what to expect
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Official Heat Pump Resources & Data Sources

BUS, Ofgem, planning rules, MCS and the data behind the numbers
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