A group of researchers in Thailand outlined a new methodology to identify the optimal temperature in two-stage cascade heat pumps using non-azeotropic refrigerants. Through their analysis, the ...

For the smart thermostat I have (an ecobee3), the answer is no. It does support two stage heating and cooling systems, but only a single zone. I think the Nest is the same. I have cheap Honeywell's, ...

The LRP16GE from Lennox Industries Inc. is an Energy Star-certified residential packaged unit designed to deliver consistent comfort and high efficiency with available two-stage heating, two-stage ...

An international research team has conducted the first empirical study on retrofitting PV-assisted two-stage heat pump (HP) systems in existing multi-family buildings. The research is part of the ...