Important: This site provides independent, informational guidance only. Nothing here constitutes financial or energy advice. Consult an MCS-accredited professional before making any decision. BUS grant figures are subject to government review. | Last Updated: March 2026
🌿 Updated March 2026

Air Source Heat Pumps: The honest cost guide for UK homeowners

Real figures, real savings projections, and everything you need to know about the £7,500 Boiler Upgrade Scheme grant — without the sales spin.

⚠ Not financial advice. We may receive compensation via referral. See footer disclosure.

✓ MCS accreditation required ✓ 0% VAT until March 2027 ✓ Ofgem-administered grant ✓ England & Wales only

Everything you need to decide with confidence

Three detailed, independently-researched guides covering cost, grants, and installer selection.

Honest facts about air source heat pumps

No sales pitch. Just the information that determines whether a heat pump is right for your home.

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Heat loss survey is non-negotiable

A proper MCS heat loss assessment — not a desktop estimate — is the only way to correctly size a heat pump. Undersized systems perform poorly; oversized ones cycle inefficiently.

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SCOP determines real-world efficiency

Seasonal Coefficient of Performance varies from 2.0 (poor insulation) to 3.2+ (well-insulated home). An EPC-D home and an EPC-A home can have very different running costs from the same unit.

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Off-gas homes benefit most

Around 4 million UK homes use oil, LPG, or electric heating. These homeowners typically see the clearest financial case for switching, with payback periods of 6–10 years after the grant.

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Low-and-slow heating is key

Heat pumps work best at consistent, lower temperatures — not the on/off cycles boiler users are accustomed to. Operating them like a boiler significantly increases running costs.

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Older homes can qualify — with caveats

A Victorian terrace can work well with a heat pump, but may need radiator upgrades or improved insulation first. A proper heat loss survey identifies exactly what is needed before any commitment.

Dedicated tariffs change the maths

Heat pump-specific electricity tariffs (~15.5p/kWh vs the standard ~24.5p/kWh) significantly improve running economics. Ask your installer which tariffs your setup qualifies for.

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⚠ Not financial advice. We may receive compensation via referral. MCS accreditation is mandatory for BUS grant eligibility. See footer disclosure.

Our information draws on these authoritative sources