What is geothermal heating and cooling (geoexchange), and how is it different from geothermal electricity?
Geothermal electricity uses very hot underground resources (steam/hot water) to generate power. Geoexchange for buildings uses the earth’s steady temperatures as a “heat source/heat sink” to heat in winter and cool in summer via ground-source heat pumps.
How does a ground-source heat pump (GSHP) system work?
A closed-loop piping system circulates fluid underground to exchange heat with the earth. Heat pumps inside the building then move heat where you need it. By having the pumps inside protected from the environment, the useful life of the equipment is extended
What problems does geothermal solve for school districts?
It targets common district pain points like volatile energy costs, aging HVAC equipment, deferred maintenance, and indoor air quality and ventilation issues. Overall maintenance is reduced with the more reliable GSHP system thereby taking pressure off of limited facilities staff.
How much can a district realistically save on energy?
Savings depend on existing systems, utility rates, and building profiles, but generally GSHPs are more efficient than conventional HVAC. In terms of energy intensity, a GSHP system can provide a reduction of up to 60%.
Does geothermal improve indoor air quality?
Yes, especially when paired with modern ventilation strategies like dedicated outdoor air systems (DOAS) that delivers filtered, fresh air more efficiently, improving comfort and supporting healthier learning environments.
How long does geothermal equipment last?
Geothermal equipment lasts upwards of 50-years, making longevity a key advantage of a GSHP system. Traditional heating and cooling systems have a useful lifespan of 20-25-years resulting in higher maintenance and replacement costs than the longer useful lifespan of a GSHP system.
Do we need a lot of land to do geothermal?
No, when surface area is limited, districts can use vertical boreholes (deeper drilling, smaller surface footprint) or horizontal loops (shallower trenches, more land area). Horizontal loops can also be installed under buildings when limited open space is available.
What geological factors matter most?
The ideal locations are those where ground temperatures remain between 45°F and 72°F at the drilling depth. However, geology plays a factor not only in thermal conductivity but also in the cost of drilling.
What is a “hybrid” geothermal system, and when is it a better fit?
Hybrid systems use geothermal for the majority of annual heating/cooling needs with traditional boilers and chillers making up the remaining needs. In areas with high heating or cooling needs, a hybrid system can supply upwards of 80% of the building load. Boilers or chillers will make the remaining load during peak times. If existing boilers and chillers are used your initial investment is not lost and can provide both supplemental peak load or back-up in times of emergencies.
How long does a typical geothermal project take from kickoff to completion?
While every site is different, a typical K-12 GSHP project often runs roughly 6–10 months from feasibility through design, permitting, installation, commissioning, and staff training, with scheduling planned to minimize disruption to learning.
Are federal rebates still available for GSHP systems?
Yes, unlike rebates for solar PV, no changes have been made to the rebate availability for new GSHP systems.
