Ground Source Heat Pumps

http://www.motherearthnews.com/green-homes/ground-source-heat-pumps.aspx

If you're looking for a brief introduction to Ground Source Heat Pumps, take a look at this article on the Building Green site. More detailed information is available in the article 'Magic Heat Pumps.'

If you're considering replacing or upgrading your current heating and cooling system, these types of systems are worth investigating because they can be very efficient.