Geothermal Heat Pump Repair | Oklahoma

Technically yes, but practically no, most HVAC companies don’t have ground loop testing equipment or training. Misdiagnosis (charging refrigerant for a loop problem) is common and wastes hundreds of dollars without fixing the issue.

Geothermal heat pumps involve both a refrigerant circuit (like any heat pump) and a ground loop circuit with its own pump, antifreeze fluid, and pressure system. Diagnosing them requires loop-specific test equipment and training that most HVAC companies don’t have. IGSHPA accreditation (which Dave holds) specifically certifies geothermal expertise. Before calling a general HVAC company for geothermal service, ask if they have IGSHPA certification or documented geothermal experience.

Almost always yes, the ground loop lasts 50+ years. Even if the indoor unit needs major work, replacing just the indoor unit (and keeping the loop) is far less expensive than a full new geothermal installation.

The most expensive part of a geothermal installation is drilling or excavating the loop field. That loop, once installed properly, lasts 50+ years with minimal maintenance. A 15-20 year old geothermal system that needs compressor work or a new indoor unit is still worth repairing or replacing the indoor unit, you’re keeping the expensive underground infrastructure. Dave evaluates the loop condition and indoor unit to give you honest guidance on the best path forward.

Symptoms of loop problems: COP (efficiency) significantly below rated spec, leaving water temperature too high in summer, entering water temperature not recovering properly, loop pressure drops over time.

Hartzell’s measures loop entering and leaving water temperatures, loop pressure, and flow rate, comparing them to manufacturer specs for your system. Degraded performance that’s worse in extreme weather often points to the loop; performance issues consistent year-round may be refrigerant or compressor. Proper diagnosis requires measuring both systems, not just assuming it’s one or the other.

Closed-loop geothermal systems lose a small amount of pressure over years from micro-permeation through the polyethylene loop and connections. Low loop pressure cuts heat-transfer efficiency and can trip flow switches.

I check loop pressure on every geothermal service call and re-pressurize if it has dropped below the manufacturer spec. The Geo 360 maintenance plan includes loop re-pressurization once a year so it never becomes a surprise repair.

Geothermal repair pricing depends on what failed. My dispatch is $99 and diagnostic is $111 (credited toward repair if you accept within 14 days).

Common repairs: refrigerant leak fix runs $400 to $900, compressor replacement $1,800 to $3,500, loop pump replacement $600 to $1,200.

If the system is 15+ years old, a refurbishment at $3,500 to $5,500 with up to a 5-year warranty often beats a $25,000 replacement. I give you the real numbers, not a guess.