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I'm game if you're serious :-D
Ours has a very high air tightness rating as I guess most new builds do and it just means that heat builds up and up and up. Couple that with being always in the sun - no other houses or trees blocking the house - and it's really fucking warm.
Soul-
What's it like in the winter with the heating off?
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I am, just need to work out some time and methods. I've seen from your posts here and there, and while your attitude is "as new builds do" and sure the specific site conditions don't help (no shade) but in my head I'm thinking "surely that's not typical?" Or more worryingly, if it is.
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One of the original articles about Part O name checks single aspect new build flats that get hotter through the day and don't let it out. It's like they were describing the flat I live in now. It's impossible to get airflow without 3 fans arranged to circulate air from one window to the next and on a hot day by 5pm or 6pm it'll be cooling outside but be hotter inside than it was at 1pm.
Stonehedge
hoefla
Sumo
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.