self sufficient

What's the cheapest, yet still safe, way to heat? Ill just need to heat a 12 x 20 house. Also, as a bonus, are there any cheap alternatives to cooling and how expensive are 12 volt refrigerators?

Hey everyone, I'm new to this forum (and to being self sufficient), and I'm looking for some ideas/feedback. A little background, I'm moving to a 7 acre farm on the 30th, I raise Golden Retrievers, I have horses, I've had 1 big and successful garden, I have a flock of chickens, and I have a...