https://heatpumpwise.co.uk/air-source-heat-pump-grant-eligibility/homeowners/ 2026-05-26T21:02:05.761Z monthly 0.75 https://heatpumpwise.co.uk/air-source-heat-pump-grant-eligibility/oil-boiler/ 2026-05-26T21:02:05.761Z monthly 0.75 https://heatpumpwise.co.uk/air-source-heat-pump-grant-eligibility/no-insulation/ 2026-05-26T21:02:05.761Z monthly 0.75 https://heatpumpwise.co.uk/air-source-heat-pump-grant-eligibility/terraced-house/ 2026-05-26T21:02:05.761Z monthly 0.75