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How Much Does It Cost To Repair A Geothermal Heating Or Cooling System?

Typical Range: $179 - $715

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As utility bills and environmental awareness rise, so does the popularity of geothermal heating and cooling. Geothermal HVAC systems are efficient and environmentally responsible with low maintenance and repair costs. You’ll spend between $179 and $715 with an average of $447 on repairs.
Geothermal is a unique type of HVAC system. It uses a ground sourced heat pump and cooling system as a means of transferring heat either to or from the Earth. A geothermal system is composed of the underground loop system, the heat pump unit, and either ductwork or a radiant heat system in your home. Most repair problems are going to involve the heat pump unit, though it is possible that the loop or ductwork will need repairs. Proper maintenance, including regular cleaning and filter changes, will avoid most serious repair issues.

On This Page:

  1. Common Problem
  2. Cost of Heat Pump & Part Fixes
  3. Signs You Need Repairs
  4. Repair or Replace?
  5. DIY or Hire a Pro

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National Average
Typical Range
$179 - $715
Low End - High End
$80 - $2,250

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Cost data is based on actual project costs as reported by 140 HomeAdvisor members in .

Common Problems that Require Repairs

Geothermal heating systems rarely need repairs. Most issues arise with the heat pump unit since it contains all the moving, electrical, and mechanical parts – which sometimes just wear out. Correctly installed loops will rarely need repairs until it gets close to the 50-year mark. Know the age of your system and get annual professional inspections.
  • Heat Pump Problems: $50-$1,700 – With any equipment of this type, parts wear out and sometimes need replacing. We’ll go into specific repairs in the next section.
  • Loop Leaks: $75-$200 – Though extremely rare, leaks do occur. However, they are quickly diagnosed and fixed. A licensed professional will inject dye into the system and look for it to appear above the buried loops.
  • Hard Water Maintenance: $150-$200 – In open loop systems where ground or well water is used, hard water buildup can be an issue if not properly maintained. A quick acid flush through the system will descale the pipes and improve heat efficiency.
  • Ductwork Cleaning: $250-$500 – Cleaning ductwork costs may seem high, but it’s well worth the investment because it can help extend the life of your filters and improve blower efficiency.
  • Ductwork Repair: $30-$50 per linear foot – Ductwork repair costs are cheap compared to the energy savings they provide. If you notice a spike in heat pump usage without added heat, get an inspection.

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Fixing a Ground System Heat Pump

As mentioned above, the heat pump is where most of your repair budget will go. A central heat pump exchanges the heat in the air the loop system and disperses it either through forced air or a hydronic radiant heating system. To do this, the system needs electronics, fans, bearings, belts, and other mechanical and electrical equipment.
  • Fan Replacement: $50 – Or sometimes less. Its bearings are often the first part to go. Be sure to 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 Replacement: $750-$1,700 – This compresses gas and air to maintain temperatures.
  • Reversing Valve Replacement: $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 Replacement: $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. Cleaning and changing the filter can lengthen the lifespan of the motor and other components.
Get Your Geothermal Unit Fixed. Hire a Pro.

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Signs That Repairs Are Needed

There are a few warning signs that all geothermal heating system owners should be on the lookout for. Symptoms often show up shortly before a major problem. Many repair issues can be averted with a yearly inspection and service of your system. Because of the complexity of the geothermal system, a highly skilled professional should inspect and diagnose any repair or maintenance issues.
  • Rising Power Bills – This is one of the first warning signs of maintenance needs. Geothermal HVAC systems are efficient by design. If they start to show signs of inefficiency, there’s a good chance a repair issue is developing.
  • Reduced Air Flow – 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 – caused by numerous issues in this type of system including leaking loops, heat pump failure, clogged ducts, clogged filters, and more.
  • Loud Sounds or Rattling – This typically signifies a mechanical issue and should be addressed quickly to avoid costlier repairs or replacement.
  • Chemical or Burning Smells – Contact a professional immediately. This could signify electronic failure or antifreeze leaks, both of which can be extremely hazardous.

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Repair or Replace?

Since repairing is only about $550 versus the $7,000 or more cost of installing a new geothermal system, it is more economical to replace parts as needed, rather than the entire system. To avoid replacement, complete all suggested geothermal system maintenance and follow the installers and manufacturers recommended maintenance schedule.
Unless you’ve hit the 50-year mark on the loops, you’ll typically never need to replace your system completely. Loops are easily and cheaply repaired for only a few hundred dollars at a time.
With the heat pump, it’s often much cheaper and more practical to replace individual parts as they wear out, rather than replace the entire unit. But, in cases where corrosion has occurred – such as in coastal regions with high salt content in the air – it may be advisable to replace the entire unit. Look for rust or leaks. If you spot either, have a licensed pro inspect your system and make a recommendation.
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DIY or Hire a Pro?

While installing a system is a job for a pro, some maintenance can be done yourself. Cleaning any condensers, coils, fans, and replacing the air filter are all easy DIY maintenance jobs. Even greasing the bearings can be done by a handy homeowner. However, when it comes time to check antifreeze levels, flush with descaler, or clean the ducts, you should consider hiring a professional to make sure the job is done correctly. Incorrect repairs or maintenance can end up causing larger problems later and void any warranties you may have.
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