Geothermal, or ground-source, heat pumps exchange heat with the shallow earth through a buried or water-based loop. The indoor heat pump is only one part of the project; loop design, geology, land or water conditions, pumping, distribution, permits, and commissioning determine performance.
What homeowners should know
Geothermal, or ground-source, heat pumps exchange heat with the shallow earth through a buried or water-based loop. The indoor heat pump is only one part of the project; loop design, geology, land or water conditions, pumping, distribution, permits, and commissioning determine performance.
Reasons to call a qualified contractor
- A major heating and cooling replacement is being planned
- The property may support vertical, horizontal, pond, or open-loop options
- Long-term ownership makes lifecycle cost important
- Existing geothermal equipment or loop controls need specialized diagnosis
Treat the ground loop as infrastructure
Vertical boreholes can reduce surface area but require drilling. Horizontal loops require more land and excavation. Pond and open-loop systems depend on site conditions and regulatory requirements.
Ask who is responsible for loop design, drilling or excavation, fusion or piping, pressure testing, flushing, antifreeze, site restoration, and as-built documentation.
Compare total system performance
Equipment ratings alone do not capture pumping energy, duct or hydronic losses, auxiliary heat, hot-water options, or the quality of loop and building design.
- Request heating and cooling load calculations
- Confirm entering-water design temperatures and loop assumptions
- Review backup heat and control sequence
- Keep loop drawings, pressure tests, model numbers, and startup data
What to compare before hiring
- Building load calculation and proposed heat-pump capacity
- Loop type, design assumptions, drilling or excavation, and restoration
- Pumping power, flow, antifreeze, controls, and distribution changes
- Permits, water rules, incentives, warranties, monitoring, and service support
HOMEOWNER FAQS
Frequently asked questions
Is geothermal the same as a ground-source heat pump?
In residential HVAC, the terms generally describe heat pumps that exchange heat with the shallow ground or groundwater rather than outdoor air.
Does every geothermal project require a large yard?
No. Vertical boreholes use less surface area than horizontal loops, but feasibility depends on geology, access, drilling rules, cost, and site conditions.
How long does a ground loop last?
Loops are intended as long-lived infrastructure, but actual life depends on material, design, installation, water chemistry, operating conditions, and maintenance. Request written warranties and records.
PRIMARY SOURCES
Official guidance used for this page
Use these government and ENERGY STAR resources to review the underlying consumer guidance.
- Geothermal Heat PumpsU.S. Department of Energy
- Consumer Guide to Geothermal Heat PumpsU.S. Department of Energy
HVACentric provides general educational information, not a diagnosis. Confirm safety, code, warranty, price, and availability directly with qualified local professionals.