- International Ground Source Heat Pump Association 499 Cordell South Oklahoma State University Stillwater, OK 74078-8018 Toll-free: 1-800-626-4747 Telephone: (405) 744-5175 Fax: (405) 744-5283 Welcome to IGSHPA s new and improved home on the Web. Our new site features more information and enhanced functions for our members. And it s still a great place to learn about geothermal heat pumps.www.igshpa.okstate.edu
- IEA Heat Pump Centre ...www.heatpumpcentre.org
- Geothermal Heat Pumps by Sunteq/Enviroteq ...geothermalheatpump.com/how.htm
