Saving Cooling and Heating Energy


Passion. Experience. Diligence.


GreenFan was created to advance the basic design of a cooling only adaptable time delay patented by John Walsh in April of 2010.  Collaboratively, Robert Mowris and John Walsh added the heating functionality in 2011.   GreenFan was incorporated by Walsh and Mowris in October of 2012. Since inception, GreenFan has sold over 86,000 Efficient Fan Controllers® into the California and Montana utility markets.  Each unit represents a home in which the residents are saving heating and cooling energy and lowering their carbon footprints.





Robert Mowris

Robert Mowris is a partner in the manufacture of the GreenFan® Efficient Fan Controller® device. Mowris is a registered professional mechanical engineer in California (# M26191) and has 33 years experience designing and evaluating energy efficiency and renewable energy technologies. Mowris has been a member of the American Society of Heating Refrigeration Air-Conditioning Engineers (ASHRAE) for 33 years. Mowris has been conducting field and laboratory tests of heating ventilating air conditioning (HVAC) products for 25 years. He has authored more than 70 published papers. Mowris holds degrees in Art Education and Mechanical Engineering from the University of Wisconsin-Madison and a Master's degree in Civil and Architectural Engineering from the University of Colorado-Boulder. Mowris has been awarded six U.S. patents: US7500368, US8583384, US9207007, US9328933, US9500386, and US9671125. 




John Walsh

John Walsh is a partner in the manufacturer of the patented GreenFan® Efficient Fan Controller® family of products. Walsh holdsa Bachelor of Science in Electrical Engineering from the University of California, Irvine and has 35 years of experience as a designer of embedded systems and high-volume manufacturing.  Walsh has been awarded seven U.S. patents: US5097407, US7240851, US8763920, US9328933, US9500386, US9671125, and US9797405.  Walsh has a background including robotics, training simulators, advanced test equipment, telecommunications, fiber optics, and neural science.  Walsh designed a interferometer based radar system that could guide rail-gun-launched interceptor projectiles to a kinetic kill of incoming projectiles at distances of 23 kilometers.  Walsh was awarded a contract by NASA to miniaturize a patented (US5097407) artificial intelligence CPU architecture I had designed to fly on the International Space Station (ISS).  Walsh designed and patented a ThermGuard™ product which received an award for “Most Innovative Product” at an industry trade show.