Geothermal heat pumps, or ground source heat pumps (GSHP) have been around for more than half a century. The technology exploits the constant temperatures we find right below the Earth’s surface, either for heating or cooling purposes, and has significantly higher efficiency than electrical heating, furnaces or even air source he
aga. Nothing better than an AGA stove in a kitchen. I stayed at sporting estate in Scotland that had a large one like this and it heated the entire manor. Apparently, there is a type that also functions as a furnace as well.
The gas heating furnace was patented by African American inventor, Alice H. Parker in 1919. This transformed heating of homes and buildings worldwide.