Geothermal Heat Pumps: How it Works
How Geothermal Works
There are good write-ups on how heat pumps work on both the Climatemaster and the WaterFurnace websites. From Climatemaster:
The earth absorbs almost 50% of all solar energy and remains a nearly constant temperature of 50°F to 70°F depending on geographic location. Working with an underground loop system, a ClimateMaster geothermal unit utilizes this constant temperature to exchange energy between your home and the earth as needed for heating and cooling.
In winter, water circulating inside a sealed loop absorbs heat from the earth and carries it to the unit. Here it is compressed to a higher temperature and sent as warm air to your indoor system for distribution throughout your home.
In the summer, the system reverses and expels heat from your home to the cooler earth via the loop system. This heat exchange process is not only natural, but is a truly ingenious and highly efficient way to create a comfortable climate in your house.
Another more detailed explanation can be found on the WaterFurnace page here.
At the company's websites, there are dealer locator links, and we used those to get quotes from local installers. There is a story there and some lessons (next post).