Cold.

When it's cold you can always find a way to be comfortable but when it's hot even if you are naked you are still hot.

I never turn on the heat in my bedroom, if it's on I cannot sleep at all. And when it's too hot during Summer I have to have air conditioning because there goes a sleepless night for me. Here (must be all the mountains) it rarely gets to the point where we need to turn it on, it can be very hot during the day but when night comes it gets cold, it gets so cold sometimes that you have to put on a coat or a big sweater on outside, starting at about 8:00 it starts to get hotter.