It is expensive enough heating one room to 80-82 ( mine is small thank God) but a whole house is overkill and too expensive. I use a Honeywell space heater the round kind to heat my room to around 80-82. On real cold nights I have to plug up another kind to help. But most the time the one Honeywell does the job. They are pretty safe if done right. They stop if tipped over and I don't let it get close to anything. I bought mine at Walmart (but there are better digital thermostat one's, infra-red type) I don't have a rack but I have one plastic tub. I use 2 uth's with thermostats. One side keeps the bottom around 80 the other keeps the bottom around 90 but I still feel I need to have the room close to 80 .
The main thing is just be safe if using a room heater, or any kind of heater really.