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Terry Proffer, B.S. Geology, CGD, IGSPA Certified Trainer
Terry Proffer has been involved in the GSHP Industry since 1993. Mr. Proffer is accredited as an installer and
installation trainer by the International Ground Source Heat Pump Association, and spent over 15 years previously as
a geologist in the petroleum industry prior to a second career in the mechanical trades. His residential and commercial
experience includes heat load analysis, loop design, thermal conductivity testing, and field installations; his system
designs drive forced air, radiant, snowmelt, domestic hot water and industrial process water applications and his
expertise is often used for independent peer review of other system designs, design validation and commissioning.
Mr. Proffer has designed, consulted or installed on thousands of tons of heat pump capacity throughout the continental
U.S, Canada and Asia, and trained over 500 contractors and engineers through IGSHPA and field training classes.
Terry is one of the few practicing Certified GeoExchange Designers in Colorado, is a factory-certified ClimateMaster
trainer, and is a member of Rocky Mountain ASHRAE.
Ed Lohrenz, B.E.S., CGD, IGSHPA & CGC Certified Trainer
Ed Lohrenz has worked in the geothermal industry since 1982 as a residential system designer, and installer, and an
equipment distributor in Western Canada. In 1984, Ed began exploring integrated geothermal ice rink and ice storage
systems and is now recognized as one of the most experienced low-temperature heat pump experts in the industry.
Between residential and commercial projects, Mr. Lohrenz has well over ten thousand tons of heat pump capacity
operating throughout North America and Asia that he has directly designed or consulted on. He is an accredited installer
and trainer for the International Ground Source Heat Pump Association (IGSHPA), a Certified GeoExchange Designer (CGD),
ASHRAE member, and trainer for the Canadian GeoExchange Coalition (CGC). He is one of the founders and president of Geo-Xergy
Systems Inc., and consults to people working in the GeoExchange industry.
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