How Much Does it Cost to Repair a Geothermal Heating or Cooling System?

Typical Range:

$172 - $951

Find out how much your project will cost.

Cost data is based on actual project costs as reported by 209 HomeAdvisor members. Embed this data

How We Get This Data

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  • Homeowners use HomeAdvisor to find pros for home projects.
  • When their projects are done, they fill out a short cost survey.
  • We compile the data and report costs back to you.

Published January 10, 2022

Written by HomeAdvisor.

Geothermal Heating Repair Cost

Expect to spend between $172 and $951 or more on geothermal heating system repairs. Larger issues, like installing a new compressor, can cost as much as $1,700 or more. Keep in mind that each repair is different, and your system could require more expensive fixes.

Most repair problems will involve the heat pump unit. Regular maintenance can help you avoid the most serious issues.

Geothermal HVAC systems use ground-sourced heat pump and cooling systems to transfer heat to or from the earth. They involve underground loop systems, heat pump units, and either ductwork or radiant heat systems in your home.

Geothermal HVAC System Repair Cost Calculator

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National Average $560
Typical Range $172 - $951
Low End - High End $59 - $4,000

Cost data is based on actual project costs as reported by 209 HomeAdvisor members.

Common Geothermal HVAC Problems & Costs

the average cost to repair a feothermal system is $500 or $80 to $3,500

Over time, moving, electrical and mechanical parts can wear out in a heat pump unit. Correctly installed loops rarely need repairs until about the 50-year mark following installation. Knowing the age of your system and getting professional inspections done frequently can help you avoid big problems down the road.

Here are a few common problems you may encounter:

  • Heat Pump Problems: $50-$1,700. With any equipment of this type, parts wear out and sometimes need replacing.

  • Loop Leaks: $75-$200. If the rare leak occurs, a licensed professional can quickly diagnose and fix the problem.

  • Hard Water Maintenance: $150-$200 Hard water buildup can be an issue if not properly maintained. A pro can run an acid flush through the system to descale the pipes and improve efficiency.

  • Ductwork Cleaning: $250-$500. Cleaning ductwork costs are well worth the to help extend the life of your filters and improve blower efficiency.

  • Ductwork Repair: $30-$50 per linear foot. Ductwork repair costs are worth the energy savings they can provide. If you notice a spike in heat pump usage without added heat, get an inspection.

Replacement Part Costs For Ground System Heat Pumps

Here’s what you might pay on average for geothermal HVAC part replacements:

  • Fan: $50 or less. Keep your bearings maintained with proper lubricants to extend the fan’s life.

  • Fan Limit Switch: $20-$75. A broken switch can lead to a broken fan.

  • Compressor: $750-$1,700. This compresses gas and air to maintain temperatures.

  • Reversing Valve: $450-$600. This valve changes the direction of the flow of antifreeze, switching the unit from cooling to heating.

  • Thermostat: $40-$70. Sometimes it's not the heat pump but a faulty thermostat.

  • Motor: $100-$500. Without a motor for a fan or water pump, heat can’t reach the rest of your home.

  • Belts, Filters, & Cleaning: $20-$150. Have a professional do annual maintenance services on your system like cleaning and changing the filter.

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Signs That Repairs Are Needed

Have a professional repair your geothermal system if you notice one of these warning signs:

  • Rising power bills. Geothermal HVAC systems are efficient by design. If they start to show signs of inefficiency, there’s a good chance an issue is developing.

  • Reduced air flow. This is usually due to a clogged filter or a failing fan or motor.

  • Uneven heating. This could be a problem with the heat pump or ductwork.

  • Reduced heat. This may be caused by leaking loops, heat pump failure, clogged ducts, clogged filters and more.

  • Loud sounds or rattling. This is typically a mechanical issue and should be addressed quickly to avoid costlier repairs.

  • Chemical or burning smells. This could be a sign of a dangerous issue. Don’t delay getting in touch with a pro.

Repairing vs. Replacing a Geothermal Heating System

Repairing a system is much less expensive than replacing it. The cost of installing a new geothermal system can run over $30,000. It’s much better to occasionally replace geothermal HVAC parts and complete all geothermal system recommended maintenance to avoid major issue.

In cases where corrosion occurs, or if your loops have hit the 50-year mark, a pro may advise you to replace the entire unit.

DIY vs. Hire a Geothermal System Repair Pro

While most repairs and installations should be done by a pro, there are some maintenance projects you can complete yourself. Cleaning condensers, coils, fans and replacing the air filters are all doable DIY tasks. More involved projects like checking antifreeze levels, flushing with descaler or cleaning the ducts should be left to a professional.

Keep in mind that poorly done repairs or maintenance could end up affecting product warranties.

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