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The Green Proving Ground program has commissioned Department of Energy National Laboratories to perform real-world measurement and verification of the following technologies in pilot installations in federally-owned buildings. Preliminary technology assessments are available below as PDFs.


Preliminary Technology Assessments

In the News: From the 2014 Program Lineup

Variable Speed Screw Chiller > This chiller promises year-round savings by modulating capacity while maintaining performance. Findings available in 2016.


High Efficiency HVAC > High efficiency heating, ventilating, and air conditioning (HVAC) units are a new class of rooftop unit (RTU) that can reduce building energy needs by half without reducing HVAC effectiveness. Blowing conditioned air through central shafts and ceiling spaces, the new technology incorporates variable speed controls on the refrigerant compressor, valves, and fans to efficiently heat or cool designated spaces as desired. The high efficiency HVAC RTUs capture and reuse heat, cold, and humidity from a building’s exhaust air and utilize waste heat from the compressors to reheat air that has been purposely over-cooled. Greater Southwest Regional Project. Findings available in 2016.

Modular Absorption Chiller > Modular micro-channel absorption chillers are powered by readily available alternative or waste heat sources (excess solar thermal, heat exhaust, or cheaper natural gas) instead of electricity, and can directly replace legacy heating, ventilation, and air conditioning (HVAC) chillers. These modular absorption chillers provide an extremely efficient method of converting heat into cold, and represent a potentially revolutionary new type of HVAC system. In addition to air conditioning, this technology can also be dual-purposed for space heating. Findings available in 2016.


The Green Proving Ground program leverages GSA’s real estate portfolio to evaluate innovative sustainable building technologies.



Green Proving Ground