2013 R&D 100 Winner
ClimateMaster Trilogy 40 Q-Mode Water-to-Air Packaged Geothermal Heat PumpThe ClimateMaster Trilogy 40 Q-Mode water-to-air packaged geothermal heat pump unit, developed by ClimateMaster and Oak Ridge National Laboratory, is the first geothermal heat pump to exceed a certified cooling efficiency of 40 EER (energy-efficiency ratio) under the AHRI’s part load ground loop rating conditions.

The heat pump owes much of its improved energy efficiency to a “trilogy” of variable-speed technologies: an inverter-driven rotary compressor, an indoor air blower and a ground-loop water pump, all of which feature permanent magnet electric motor technology. In addition to having lower energy consumption than conventional motor technology, these variable-speed components enable the heat pump to match the heating or cooling output to meet house loads with much greater efficiencies at part-load conditions. By reducing the speed of the pump and blower motors when heating or cooling demand is low, the Trilogy 40 Q-Mode is able to reduce electricity consumption by 80% or more during much of the year. The compressor can also be driven at higher speeds when the house heating demand is high, allowing the system to minimize or eliminate the use of electric resistance backup heat in cold climates.

Geothermal heat pump

Oak Ridge National Laboratory

Development Team

ClimateMaster's ClimateMaster Trilogy 40 Q-Mode Geothermal Heat Pump development team (l-r): Dennis Harris, Shawn Hern, Dan Ellis.


Oak Ridge National Laboratory's ClimateMaster Trilogy 40 Q-Mode Geothermal Heat Pump development team.


The ClimateMaster Trilogy 40 Q-Mode Geothermal Heat Pump Development Team
Shawn Hern, Principal Developer, ClimateMaster
Van Baxter, Principal Developer, Oak Ridge National Laboratory
Moonis Ally, Oak Ridge National Laboratory
Daniel Ellis, ClimateMaster
Anthony Gehl, Oak Ridge National Laboratory
Dennis Harris, ClimateMaster
Jeffrey Munk, Oak Ridge National Laboratory
Keith Rice, Oak Ridge National Laboratory
Bo Shen, Oak Ridge National Laboratory
Ed Vineyard, Oak Ridge National Laboratory