Rubies in Crystal

My habit is to turn off the heat every night. After the power failure at dawn this morning, man it was frigid, I am reconsidering.

(I live on an upper floor in an apartment with electric heat. Très expensive! The heaters are controlled in each room by a thermostat. The lowest setting is 5˚C. A lot of heat travels upwards through the building. My daughter and I both have winter weight down duvets that are super warm. If the heat is on, she will open the window, even in the middle of winter! I have a heated blanket that I use to warm up my bed, though even on low it is usually too hot for the whole night. However, a 3 hour power failure in an already cold apartment was downright frigid. When the electricity came back on, I turned up *all* the thermostats to 20˚C for awhile, just because.)