I’ve been looking into geothermal energy for your home as well & I found this guide that you should get if you are considering geothermal energy to heat your home. You can pay $20,000 – $30,000 to get a geothermal energy system installed in your home so its not cheap.
Basically deeper than 6 feet below the ground level & the temperature remains relativly constant at 50 – 60 degress F. This can be used to heat your house using water filled pipes buried in your back garden in a closed loop to transfer heat to your home using a heat pump.
This information is put together well with the assistance of people from Global Greenhouse Warming.com. And is a ‘must have’ if your are considering installing a geothermal system. It covers all you need to know such as costs, finding the right system for your needs, installation etc. This information could save you money in itself by helping you to purchase the right geothermal system for your house.