Podcast: Engineering Geothermal Heat Pumps

Heat pumps, which use the outside as a source—or sink—for heat, are a familiar environmental control technology in many homes. But one drawback is that, when outside temperatures are at the extreme, heat pumps begin to lose efficiency. Kathy Hannun, founder and president of Dandelion Energy, a company that makes household geothermal heat pump systems, discusses the efficiency advantages and engineering challenges of drawing heat from the ground.

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