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Best Remortgage for a Heat Pump 2026

Remortgaging to fund an air-source or ground-source heat pump releases equity at mortgage rates and may combine with grants and green deals. This guide covers the best lenders, the grant angle, and the alternatives in 2026.

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Quick Answer: Best Remortgage for a Heat Pump in 2026

Mainstream lenders — Halifax, Nationwide, Santander, Barclays, NatWest — allow remortgaging to fund a heat pump as a home improvement, at residential rates, up to 85-90% LTV. Government grant schemes can cover a chunk of the cost, so you may only need to remortgage for the balance. A heat pump that lifts your EPC can also unlock a green remortgage with a discounted rate or cashback. Combine grant + low-rate borrowing + green deal for the cheapest route. A broker coordinates the green angle.

Rates last reviewed June 2026. Figures shown are indicative market ranges to help you compare — not live quotes or personalised offers. Mortgage rates change daily and depend on your circumstances, the lender's criteria and the Bank of England base rate. Check live rates for your profile →

How Funding a Heat Pump Works

You combine grants with low-cost borrowing:

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Gary from London

"Easier Than Expected"

Gary, London
★★★★★
"I kept putting off remortgaging because I thought it would be a massive headache. Honestly, the whole thing was painless — filled in a quick form, got my options, and it was all sorted within weeks. Wish I'd done it sooner."
Katie from London

"Done In No Time"

Katie, London
★★★★★
"Our fixed rate was ending in a month and I was panicking about going onto the SVR. Managed to get everything sorted really quickly and we're now on a much better rate. Saving us about £200 a month."
Janet from Exeter

"So Much Better Off"

Janet, Exeter
★★★★★
"Was a bit nervous about switching as I'd been with the same lender for years. Turns out I was massively overpaying — got a much better deal and the whole process was far easier than I expected."
Lucy from Tamworth

"Happy Saving"

Lucy, Tamworth
★★★★★
"After having to pay a ridiculous amount due to the interest rate hike, we have now got a more suitable monthly payment, consolidated a loan and have money left for hopefully a loft conversion."

Stacking the Savings (2026)

Cost-reducerHow it helps
Government grantCuts the upfront cost you need to fund
Low-rate remortgageFunds the balance cheaply vs personal finance
Green remortgage dealDiscounted rate / cashback for better EPC
Insulation alongsideLowers running costs, boosts EPC further

The smart play is to stack all four: take the grant, fund the rest at a low (ideally green) mortgage rate, and improve insulation at the same time so the heat pump runs efficiently.

How to Fund a Heat Pump Cost-Effectively

To minimise the cost of going low-carbon:

Best Alternatives and Related Options

Related routes for funding a heat pump:

Important: Your home may be repossessed if you do not keep up repayments on your mortgage. There will be a fee for mortgage advice. The actual rate available will depend on your circumstances. Think carefully before securing other debts against your home.

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Frequently Asked Questions

Yes — mainstream lenders including Halifax, Nationwide, Santander, Barclays and NatWest allow remortgaging to fund a heat pump as a home improvement, at residential rates, up to 85-90% LTV. Government grant schemes can cover a substantial part of the cost, so you may only need to remortgage for the balance. A heat pump that improves your EPC can also unlock a green remortgage with a discounted rate or cashback.

Yes — government schemes such as the Boiler Upgrade Scheme (England and Wales), with equivalents in Scotland, offer grants toward air- and ground-source heat pumps, which can cover a significant chunk of the cost. This reduces the amount you need to remortgage for. Grant availability and amounts change over time, so check the current scheme details. Combining a grant with low-rate borrowing is the cheapest route.

Potentially — a heat pump can improve your home's EPC rating, which several lenders reward with a green remortgage offering a discounted rate or cashback. The benefit depends on the lender and the EPC improvement, and is greatest when combined with insulation upgrades that further boost the rating. An updated EPC documenting the better rating supports eligibility. A broker can identify green deals you'd qualify for.

After any government grant, you'd typically remortgage for the remaining balance of the install — a modest capital raise relative to most homeowners' equity, funded at residential mortgage rates (4.5-5.5%), far below personal or green-improvement finance. Ground-source systems cost more than air-source. Releasing this sum usually leaves your LTV barely changed, and a green deal may even lower your rate. A broker can confirm the numbers.

Ideally yes — heat pumps run most efficiently (and cheaply) in well-insulated homes, so pairing the install with insulation upgrades lowers your running costs and boosts your EPC further, which can enhance green-remortgage eligibility. You can fund both through the same capital raise. Improving the building fabric alongside the heat pump maximises both the comfort and the financial benefit of going low-carbon.

Usually yes — residential mortgage rates (4.5-5.5%) are well below typical dedicated green-improvement or personal finance, so remortgaging to fund the balance after a grant is the cheaper route. The caveat is that mortgage debt spreads over a long term, so consider overpaying to clear the cost sooner. Mid-deal, a further advance or secured loan funds the heat pump without disturbing your existing rate. Compare with a broker.

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