I am suffering that at the moment in Oxfordshire. Just a bit of morning sun heats my bedroom up to 28 C. Totally insane. Leaving the windows open barely helps.

I am suffering that at the moment in Oxfordshire. Just a bit of morning sun heats my bedroom up to 28 C. Totally insane. Leaving the windows open barely helps. My grandmas flat, in Southern spain, did not have AC. But thanks to big walls and external blinds you could live comfortably even during 40+ C Summer days. External blinds are a killer feature both for heat and cold insulation.