Geothermal Heat Pumps: How We Installed Our Green Alternative to Fuel Oil Heating, Part 2


Vertical ground loops. 

Installing horizontal ground loops. Photo by Steve Ehrman.

This is part two in a three article series on geothermal heat pumps. Part one can be found here.

Our geothermal installation took five days and was followed by an inspection and training session. The amount of time and effort involved in setting up a new system varies, depending on the location of your existing heating and cooling units in relation to where the ground loops enter your house, and on the location and configuration of your ductwork, electric wiring, and hot water heater.

Day 1

We awoke early in the morning as the ground loop installation crew arrived. A large flatbed trailer parked in front of our home, carrying an excavator and a compact track loader. This day’s work consisted of digging the horizontal trenches for the ground loops, laying the loops, replacing the removed soil, and running the loops into the back of the house.

In total, our Water Furnace required four 150-foot horizontal trenches, each five feet deep. These were joined at the end of our yard by a “header” which routes the water/antifreeze mixture from the house through each of the loops in parallel and then sends the heated or cooled mixture back to the house.

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