The DOE webinar on Geothermal Heat Pumps that was run on Thursday, will be posted online for viewing along with the collection of other webinars in the DOE programs.
The Heat Pump webinar offered a basic intro to the concept, with a detailed case study. In the meantime, here is a short video entitled Energy 101: Geothermal Heat Pumps.
AZGS is the prime contractor to DOE on adding data from all 50 states to the National Geothermal Data System, including information on geothermal (or ground source) heat pumps.