I'm abit extreme with how much seasonal variation, in that I use extremely little climate control in my house (a fan at most and usually only a single space heater). Nighttime/morning exterior temps dropping to 25f/-4C was pretty normal this winter. I'd guess the house stayed just above 0C at the lowest for the most part. Usually start acclamating with a few cold showers. The problem is 70 starts feeling oppressive and I end up getting heat uticaria going grocery shopping lol.