Here's an article from the Guardian Unlimited on alternative heating for homes and businesses. I'm sure it's nothing new, but I had never heard of this particular implementation. Basically, you bury some pipes filled with water and antifreeze about a meter deep and then run the liquid through a series of pumps. The slight temperature increase gained from the surrounding ground is siphoned off through a heat pump and used to heat rooms or water.
It is incredibly effective, capable of achieving 400% efficiency - giving out more energy (typically 3 to 4 kilowatts) than the householder puts in to run it (typically 1KW). By comparison, an average gas boiler works at 90% efficiency at best.Very cool ,er warm, whatever.
Could your lawn keep your home warm? - Guardian Unlimited