Four heat pump makers develop successful sub-zero prototypes in the US
Four more heat pump manufacturers have successfully developed cold-climate prototypes as part of the Department of Energy’s (DOE) Residential Cold Climate Heat Pump Challenge. To take part in the Challenge, manufacturers’ heat pumps must deliver 100% heating capacity without the use of auxiliary heat, with significantly higher efficiencies at 5F (-15C), and ideally operate at -15F […]