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Cc @soul
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I was actually thinking recently about doing some kind of case study / analysis on Soul's house, to see whether it's unusual or typical (of decent quality new builds). A new Building Regulation - Part O for Overheating - has come in since it was built though.
It's a big shift for people to take overheating seriously in homes. Passivhaus requires low energy consumption for both space heating and cooling so takes into consideration overheating. Enerphit (the equivalent for retrofit) is quite difficult to achieve.
I stand to be corrected but i'm pretty sure that decent insulation keeps homes cool in summer too.