This is going to sound ridiculous coming from me, because I’ve lived in Canada for the last 20 years. Yeah, I know. Canada, the Great White North. Canada, where -40c in the winter is a very real possibility where I live (and a reality further north). Where it can get so cold the air will freeze your face in seconds.

But it’s also not uncommon to see 30c in the summer before humidity (it can reach 38c with humidity where I am in the Maritimes).

What we have learnt over the years is that blackout curtains are a must. Keep them closed if there’s a chance the sun will hit window during the day, and if the temperature is warmer outside than in do not open the windows. At night, if the temp drops below your house temp, put a fan blowing out the window on a table from a foot away; I don’t know the science, but it sucks the air out and pulls in the cooler air. When you’re over heating dip your inner forearms in cold water, use a cold bandana. Don’t worry about sunscreen, keep yourself mostly covered in light clothing with a wide brimmed hat if you’re outside (if you don’t have that, use sunscreen - sun burns make everything worse. Frozen flannels on your head can cool you down at night (or the frozen hot water bottle recommended by u/Dont_trust_royalmail). Fans in front of ice.

All this is assuming you don’t have access to an AC unit of some kind. We installed two heat pumps last year or two and they have been worth every bloody penny in terms of comfort and my ability to rest and sleep in the summer in my home.