A 1960s ex-council house in south London, retrofitted to the Passivhaus standard, stayed 10C cooler than outside during a heatwave, without air conditioning. The standard, which involves super-insulation and airtightness, is gaining popularity as UK homes face rising temperatures. Retrofits are costly but can cut energy demand by up to 88%.
UK Passivhaus retrofit keeps 1960s home cool without AC
Source: BBC