How much would a geothermal heating system cost?
$24,000 to heat/cool my 4100 sq/ft home with a single unit. If the house was larger, I would have needed two exchanger/handlers. I had 8 horizontal loops trenched in my field instead of the minimum 6 needed that way I could upgrade my system to serve my basement and the finished attic in the future. The pumps are in the basement, but I had the air handler mounted in the attic because the second floor is 2500 sq/ft and the first floor is 1600 sq/ft (1200 sq/ft garage is in rear section of 1st floor and not served with geothermal) and it would be easier to blow air a longer distance for a smaller floor than the larger floor. I have sprayed foam insulation plus r12-r19 fiberglass batts in the walls, 2×6 construction, and low-e double pane windows. The estimate for my monthly electric bill (geo-thermal is all electric) is $200-225, but I have not moved in yet to verify that. A standard oil/propane furnace with central air was quoted at $14,000 with a monthly operating cost of over $500. I
