An electrically powered, geothermal heating and cooling system transfers heat between your lake house and the earth using fluid circulated through long loops of underground pipe.
In principle, a geothermal heat pump functions like a conventional heat pump, by using high-pressure refrigerant to capture and move heat between indoors and out. The difference is that conventional systems gather their heat—and get rid of it—through the outside air. Geothermal systems, in contrast, transfer heat through long loops of liquid-filled pipe buried in the ground.
Why you’d want one
Cuts home heating and cooling bills by 30 to 70 percent. Eliminates noisy outdoor compressors and fans. Reduces greenhouse gas emissions by the equivalent of planting 750 trees or taking two cars off the road.
What to look for
For federal tax credits, pumps must meet Energy Star efficiency standards. For closed-loop systems, you need an EER of 14.1 and a COP (coefficient of performance) of 3.3.
Where to get it
To find manufacturers, visit the Geothermal Heat Pump Consortium website. To find trained installers and designers who know the local geology and how to size systems for maximum efficiency, go to the International Ground Source Heat Pump Association’s website.
by: Max Alexander, This Old House magazine. Read the full article!