I am researching ground source heat pumps, however I do not completely understand how they work. I understand that a pump uses a small amount of electricity to pump heated ground water or an antifreeze solution through the a system of piping in the ground to transfer heat from the ground to a home. What I don't understand how this actually heats the house to a comfortable temperature in some areas. On this site, http://www.davocal.ie/Assets/services/eco_friendly/eco_friendly.php [Broken] it says in this country (not sure where) the ground temperature several metres down varies from 10 - 13 degrees. This document, http://www.nrc-cnrc.gc.ca/obj/irc/doc/pubs/rp/rp33/rp33.pdf [Broken] on page 7, shows a chart that shows a chart of ground temperatures for Ottawa, Canada (which is near where i live) in clay. At 15 feet below the surface the temperature varied from 45-50 F over the year in 1954-1955. So say the ground is around 50 F and you have your piping with antifreeze running through there, how is that going to work on its own to heat a home. Is there a way that the system can obtain a higher temperature via friction or running through the pump or would the ground heated solution need to be pumped through another heating unit above ground to give it another 15-20 degrees of heat to allow it to heat a home to a comfortable temperature. Also I know that Environment Canada takes readings of the ground temperatures twice daily at 60,000 locations across Canada. I have been looking for there publications or reports but cant find any. Does anyone know where to find these?