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AnswerWhat size heat pump for a 1930s semi?
A 1930s semi typically needs a 8–11 kW air-source heat pump. Cavity walls; a strong candidate once loft and cavity insulation are done.
Older, solid-wall homes lose more heat, so insulation and correctly-sized radiators matter as much as the heat pump itself.
| Estimated size | 8–11 kW |
|---|---|
| First step | Insulation + heat-loss survey |
Are heat pumps good for old houses? →
2026 figures, based on Energy Saving Trust, Ofgem & gov.uk data · always confirm with a professional survey.