As you celebrate Earth Day 2016, find out if you're living as "green" as you think.
Putting one of these heating systems in isn't cheap. Systems can cost $10,000 to $25,000 and up. But again, you get a federal tax credit through 2016 and geothermal systems can cut your energy bills in half each year.
JonathunderMedal: Erik Lindberg (1873-1966)/Wikimedia Commons
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Bulgarian Ministry of Interior via CNN
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Tennessee Highway Patrol/Twitter via CNN
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SRI International via Wikimedia Commons
Rankin Bass via Wikimedia Commons
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