Geothermal Heat Pumps Offer Comfort and Efficiency

Illustrated diagram of a geothermal heat pump, showing underground pipes that supply ground-source heat
Geothermal heat pumps absorb heat from the ground to warm your home. (DepositPhotos)

Wondering about the best way to heat and cool a home? There’s a number of choices, but one stands out from the rest: a geothermal heat pump.

Standard air-source heat pumps work well for warm to moderate climates. However, they can become expensive to use for heat when the temperature drops below 35 degrees Fahrenheit.

That’s because they draw their heat from the air; this causes backup electric heat strips to cut on for additional heat at lower temperatures.

So, some homeowners in colder climates look for a more efficient alternative. And it turns out, that source is right in their backyard.

A man installs pipes for a geothermal heat pump
In a geothermal system, buried polyethylene pipes exchange heat to keep you warm inside your home. (DepositPhotos)

How Geothermal Heat Pumps Work

While a standard heat pump uses the temperature of outside air for heating and cooling, a geothermal one draws on more constant temperatures found underground as the medium of exchange.

Through a series of buried pipes, a geothermal heat pump absorbs heat from the ground to warm your home. In the summer, the process reverses, with heat removed from your home and transferred back into the ground.

A network of buried polyethylene pipes used to exchange heat operates as either a closed or open loop.

In a closed-loop system, a mixture of antifreeze and water circulates from the heat pump through the pipes and back again. An open loop draws water from a well or pond, which then returns to the ground after use.

Installers bury ipes for a closed-loop geothermal system horizontally 4 to 7 feet deep. Or they bury them vertically 150 to 400 feet underground.

Once the heat has been extracted from the fluid, it’s transferred to an air handler and ductwork to your home. This is similar to other forced-air HVAC systems.


  1. We have a customer that lives at 8600 feet currently has a propane fired boiler to heat his home that is need of replacement
    Research shows that a 96% replacement boiler only performs at 65% at altitude according to the home owner.
    the home owner is thinking of switching from propain to electric boiler
    Can you shed some efficacy on this subject
    thank you mike

  2. I will be replacing my HVAC system any day (it’s 20 yrs old). It’s electric unit with heat pump. I personally hate heat pumps. The house never seems warm in the winter or cool in summer. I live in Savannah GA. Our summers can be brutal. Winters vary. I have gas line to the house. Also natural gas is deregulated in GA and electricity is not.

    Thanks for your help!

    I loved the hot water heater calculater which showed I would save 50% if I switched to gas.

  3. Thanks for sharing this article, Danny! I think it’s awesome that you’re sharing efficient ways to heat and cool homes. You mentioned some valuable advice: getting a programmable thermostat. When you’re not at home, it’s important NOT to running the air conditioning or heating because you don’t need it—it’s simple. However, something that people aren’t aware of: changing your air filters on your HVAC machine can also help improve your efficiency. If there is dirt or debris covering the filter, the air won’t be circulating as efficiently as it could. Keep that in mind!


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