what do you use for heat

in the house.

Corn furnace (home grown = cheap) Amazingly wam :)
natural gas in the warmer days.

out in the shop 30 X 30 shed we burn wood in a home made stove. Used an old outside storage propane tank and cut it in half. Then added a door and burn garbage, wood, things that look burnable and anything that needs to be disposed of. (kind of like an incinerator)
Also use the same wood stove for warming up bearings to install on shafts.. its multi purpose :)