Ducted heat pump and air handler behaviour
We had a ducted heat pump and air handler installed last Spring to replace an existing FA gas furnace heating system. To date, the system appears to be working well at managing the cooling and heating of our home, however we noticed immediately that the air handler fan appears to run continuously (24/7) even when the room temperature shown on the thermostat matches the set temperature. Is this normal behaviour for ducted heat pump systems? This seems to use energy for the fan when it’s not required and could also result in long-term wear on the fan bearings, etc.
Our old FA furnace fan would come on and off with the burner to maintain the thermostat setting. An energy advisor firm provided a Canadian EnerGuide rating for our insulated 1929 Vancouver BC (Zone 4?) house at 56 GJ/year with 5.1 air changes / hour. The heat pump system installed is a Mitsubishi PUZ-HA24NHA1 outdoor unit, a Mitsubishi PVA-A24AA7 indoor unit, with a Mitsubishi PAR-40MAAU remote controller replacing the furnace thermostat at the same location in the house. Since I’m new to heat pumps I don’t know what the expected behaviour should be. Any advice is appreciated.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part