Geothermal vs Air-Source Heat Pump
**Geothermal** (ground-source) loops use stable underground temps for top efficiency—high drill/trench cost. **Air-source heat pumps** are cheaper to install and improve yearly but lose efficiency in extreme cold without cold-climate models.
Step by step
1. Site survey
Geothermal needs yard space or vertical wells—HOA may restrict.
2. Compare COP
Coefficient of performance drives operating cost vs gas backup.
3. Stack rebates
Federal and utility incentives differ by equipment type and income.
Geothermal vs air-source
Geothermal wins 20-year cost on big loads if install is feasible.
- Geothermal: Highest efficiency; high upfront; long payback.
- Air-source: Lower install; cold-climate models needed in north.
Use our calculators
Common mistakes
- Undersizing air-source in cold zones
- Ignoring loop maintenance on pond systems
FAQ
Does geothermal cool too?
Yes—same loop provides heating and central cooling.