Energy 101: Geothermal Heat Pumps
Why the open web links it
Explains how geothermal heat pumps use the Earth's stable underground temperature for heating and cooling.
Linked by 36 independent sites, 9 of them widely read in the 2026-10 crawl of the open web, including energy.gov, treasury.gov, dc.gov, sense.com, libretexts.org.