What do you keep your heat on?

Given the very sudden frigid temperatures, I’m sure everyone has turned their heat on by now. Due to a career change, I’ve had to move back home temporarily until I can get back on my feet. My Mother keeps her heat set on 64. As if that isn’t bad enough, she keeps all the curtains and main doors open during the day for extra lighting. You can feel the cold air coming in through the storm doors. Just wanted to check with other people in the area to see what they keep their heat set on.