this post was submitted on 12 Jan 2024
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From what I understand, you only use a heat pump until the outside temp reaches 0c, maybe -5c. Below that you go back to using the furnace.
One of the big draws of a heat pump is pumping heat "out" of the house in summer instead of running an air conditioner. If you get a chilly spring night, the heat pump should maintain the house temp without running the furnace. Supposedly it does both of these more economically than running an AC and furnace, but it is not a replacement for a furnace.
Daikin, Mitsubishi say -13F.
You can switch on an aux heat source after that. Resistive, gas, wood. Most air handlers have optional resistive heat.
An air conditioner is a heat pump. Very little difference.
It’s not quite that simple; the output drops as the temperature gets really cold, so auxiliary heat likely kicks in before the heat pump actually shuts off. They’re still great, efficient technology, but when considering auxiliary heating needs and system sizing, the reduced output at low temperatures needs to be considered.