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 2015 Program Lineup

Continuous Combustion Control System > This system optimizes the fuel mix in gas-fired boilers to increase boiler efficiency and reduce emissions. Findings available in 2017.

Intelligent Energy Valves for Hydronic Systems > This technology reduces the power consumed by pumps in hydronic heating and cooling systems by maintaining an optimal temperature difference (Delta-T) between fluid supply and return lines. Findings available in 2017.

Smart Ceiling Fans > These fans monitor a room’s temperature and humidity, and automatically adjust fan speed to maintain occupant comfort as environmental conditions change. Findings available in 2017.

Smart Scrubbers for HVAC Load Reduction > This technology reduces the volume of outside air required to maintain indoor air quality (IAQ) by using absorbent materials to selectively remove contaminants from HVAC airflow. Findings available in 2017.


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 test innovative building technologies and provide recommendations on their deployment.


Last Reviewed 2015-10-05