This note TEC 6, originally published in February 1999, was reviewed by Chris Arkins in January 2004. This summary page includes recent updates to the topic since publication. Alternative low energy air conditioning solutions are now being commonly sought in preference to typical air conditioning systems for both residential and commercial applications. Whilst still a developing market in Australia, ground source heat pumps (GSHP) offer environmental advantages over more commonly used air conditioning systems. This Note introduces the GSHP and provides an overview to applications, benefits and system types.