Alright me lids I'm running an experiment.
Yesterday was 32c round these parts, and I basically shut every window in the house, closed all the curtains, and rolled with the "the air will be cooler in here than out there" approach. I then only opened the windows at like 9pm when, in theory, the air was in the 20s.

It was still too fucking hot as I tried to sleep.

Today I've opened every fucking window to get cross channel breeze through the house and I'm gonna see if it's any cooler.
There was some good wind earlier, even made a door slam shut, but since then it's still too fucking hot.