Tractor supply has them on clearance apparently they have been on clearance for a while now. So I'm getting one. The big one was originally $1,100 the manager asked me if I was seriously thinking about getting one and said he could do 650. They carry a big one and a bigger one. The big one holds 50lb of coal, the bigger one holds 70lb. Normally I say bigger is better, but the bigger one uses 2 blower fans. The big one only uses a single fan. That means double the power for the bigger one. The fans are the same size, just that the bigger furnace uses 2. I guess normally these go outside. I want to put mine in the garage.