A geothermal heat pump, is a highly efficient renewable energy technology that uses the temperature of the earth beneath the surface to provide heating and cooling. It can be done just about anywhere in the United States all year round, as the temperature behind the surface of the earth remains fairly constant. The geothermal heat pump acts as a heat sink in the summer by transferring heat from the building into the earth or groundwater, and as a heat source in the winter by transferring heat stored in the earth or in groundwater into the building.
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To achieve Passivhaus certification, the homes have to achieve a minimum air tightness level of 0.60 ACH 50, which is five times “tighter” than the 3.0 ACH 50 required of new Maryland code-built houses. In this image, Robert Champ of...