Two stage-Heat pumps
Multi-stage heat pumps manufacturers now offor heat pumps with two-stage compressors these systems have two stages of cooling and three stages of heat: 2 stages of compressor Heat and one stage of supplemental heat 2 stage step systems operate at the low compressor capacity most of the time this allows them to use as little energy as possible when the full system capacity is not needed. Operating on low capacity also gives longer run time reducing the energy lost from cycling on and off.
They do require thermostat that are capable of two stage of cooling in three stages of heating the two-stage compressors are controlled by a board that controls all operation through a solenoid in the compressor mANY heat pumps with two-stage compressors have built-in communicating controls they are designed to work with indoor blowers using variable speed brushless DC motors which are called ecm’s when the heat pump is operating at low capacity the indoor blower speed reducers to match the system’s capacity when the thermostat calls for high-heat the indoor blower speed ramps up to match the increase compression capacity heat pump systems using to capacity compressors and ECM Motors typically achieve efficiencies of 20 Seer and 10 hspf. WWW.ORLANDOVENTILATION.COM