go talk to a few heating and AC shops. Sometimes people upgrade their furnace and you can get the old ones pretty cheep. Then all you gotta do is wire it and mount a thermstat on it. They will pretty easily keep a 6000' house toasty warm. Alot of the builders and painters around here do that cause the AC guys won't turn on the house furnace until the house is done. Paint doesn't like to dry when its 2 degrees in the house.
I'm hoping I can do this soon.