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54. Earth Tubes are cool & they can heat too!
b"The earth tube is a humble, simple invention. It pre-heats or pre-cools the air coming into a building by running it through an underground pipe. If you go a meter or two underground the earth is a constant 4-6 degrees. By taking advantage of that free heat you can can save a ton of money. We explore a couple earth tube projects in this episode of CKUA's Green Energy Futures."