Sources

1. Heat pumps in older homes: a field study

   Building Energy ReviewMarch 2026

   Homes built before 1950 kept a steady indoor temperature after loft and wall insulation, even on the coldest days.

   Open

2. Grants for home heating, 2026

   energy-advice.exampleUpdated 4 Nov 2026

   Open

3. Running costs calculator: method notes

   Tamsworth Home Lab

   Prices use the average unit rate for the last twelve months, not today's tariff.

   Open