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What to Expect When You Upgrade from Gas-Forced Air to Geothermal

Carla Morris March 05 5 minutes reading time

If you've decided to upgrade from gas-forced air HVAC to geothermal heating and cooling, you can expect to enjoy immediate monthly savings. You can also expect some changes in routine maintenance, but not everything will change. Here's an overview.  

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Clean filters – With your gas system, you replace dirty furnace filters to keep them from recirculating dirt and dust particles throughout your home. Expect to do the same with your geothermal system's air filters. But, because geothermal systems are more efficient, you may need to replace them less frequently.  

Inspect ducts – Leaky air ducts reduce the efficiency of both gas and geothermal systems. Seal leaks and repair loose or damaged ductwork. Check registers to ensure each one delivers sufficient airflow to your rooms. Insufficient airflow may indicate an obstruction.  Your geothermal installer or a contractor can assist with this.    

Check thermostat – If you've installed a programmable thermostat, you'll want to check it periodically to ensure that it communicates with your geothermal system (just like you did for a gas system). If it's battery-powered, be sure to change the batteries to keep them fresh.  

System cleanliness – Outside, you keep air conditioning condensers free of objects, debris, and vegetation that hinder airflow. While many geothermal systems don't have an outdoor unit, you'll still check that internal components are free of dust and debris.  

Professional assistance – Just as you schedule yearly checks with a qualified HVAC contractor for your gas system, you'll schedule regular maintenance checks for your geothermal system. Expect the contractor to check some of the same things he/she checked on your gas system, like motors, controls, and sensors.  


Geothermal systems have a longer lifespan than gas furnace systems and require relatively little maintenance. Still, annual checks of the following components by a qualified HVAC professional will ensure top performance.  

Ground loop inspection – In geothermal systems, loops of pipe buried in the ground carry a mixture of water and anti-freeze solution between the Earth and your home. An annual non-invasive inspection of this "ground loop" safeguards against leaks, damage, or deterioration.   

Refrigerant check – Geothermal systems also use a refrigerant loop to transfer heat between the ground loop and your indoor heat pump. An annual check ensures that your system has the correct refrigerant charge and helps identify any refrigerant leaks.  

Water testing – Some geothermal systems use an open loop design that draws water from a well or other water source. Annual testing will reveal if your water requires treatment or filtration.  

Pump and blower check – Geothermal systems use pumps to circulate the heat exchange fluid and blowers to distribute conditioned air. These components should be lubricated and checked annually for proper operation.   

Maintenance requirements for geothermal systems vary based on factors like system design, climate, and usage. It's always best to consult with a qualified HVAC professional experienced with geothermal systems.   


When you use geothermal heating and cooling, you can cut your monthly energy costs by up to 70%. The experts at Enertech are glad to help you explore energy-saving and money-saving options that will work best for you. Contact us today.    

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