I bet you didn't know that on cool days there is heat that can be extracted from the air. Even better, you can get heat from ground water or underground sources. And you don't have to be in a volcanically active area. Heat pumps are basically air conditioners that run in reverse — but they are designed to extract heat from the air, water or ground (cooling these heat reservoirs in the process).

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Have questions for Barry? Share them in the comments and they may be answered in the next episode.

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