Links
- Galbraith Builders
- GeoSource Geothermal Systems
- GeoComfort Geothermal Systems
- Venmar HRV Systems
- International Ground Source Heat Pump Association
- Database of State Incentives for Renewables and Efficiency (DISRE)
- United States Department of Energy
- Geoexchange Geothermal Heat Pump Consortium
- National Groundwater Association
- Colorado GeoEnergy Heat Pump Association
- Alliance for Sustainable Colorado
- National Renewable Energy Laboratory
- United State Green Building Council-Colorado Chapter