... A quiet space heater sounds good to me.
This is exactly my plan for this winter! Keep the heat off and run mining equipment all around my home to keep it toasty.

Yeah my den was always cold until BTC. Last year I pulled so much power with gpus my house was down right hot. From oct to apr.
This winter I will run 88 - 100 sticks in my den it will keep my den warm.
My sticks and blades keep rooms comfortable, but it's my GPU farm which really brings the tropics to the house.
This past week with air temperature outside in the 50's and the windows open, the house was averaging 86-88F. 3,000sq/ft house, with all the doors open to all the rooms were sharing in the thermal load. Fans were bringing in cool air too, it wasn't stagnant. GPU's just make things toasty. At a few points on some of the middle-of-the-road scrypt coins, I was more than half the network hash rate lol
Very warm lol