When I was married...Me :)
I was the only one who read the manual on how to program the sucker.
Also, usually the only one home.
My ex was ALWAYS hot (I've woken up to the air conditioner on, and windows open with 6" of snow in front of the window). I'm always cold. We had separate blankets... Me'self 2 layers of down certified to -20, himself a 'heavy' quilt that I had made for him out of no heat Fenton fabric (he liked weight, but even in the snowy room ... In just boxers was fussing at me to turn the thermostat down. <rolls eyes>
In all fairness, his parents used to lock him and his sister down in the (unheated) basement in the middle of winter for weeks on end in shirtsleeves and little if any food. So his body is wired a little weird.
Me? I grew up in 100 degree winters, so I'm set for deserts & jungles. And this 50 degree business kills me. (Ahem. I LOVE snow. In no small part because of snow SUITS, and roaring fires. And temp below 30 is 'dry' like I like it).
So I figured if he was going to always be hot, regardless of temp, at least I could be comfy!