In the video, the heat from the building is discharged to the air outside of the home. Usually when an air conditioner is running, it has to discharge the heat to an already warm place. It would be easier and less expensive for the heat pump to transfer the heat to a cooler place.
With a geothermal system, the heat is discharged into a cool place below the surface of your yard. The earth is typically 58 degrees at a depth of 6'-'8' below the earths surface near St Paul, Minnesota. The temperature will vary according to your location -colder to the north and warmer to the south.
In the winter months, the heat pump is reversed to move heat from the earth, and place it inside of your home. Here is the link to the video.
http://www.youtube.com/watch?v=B-cnkjjJUaQ
Thank you,
Builder Bob
http://www.bmichels-const.com/
