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noneabove1182 , 5 months ago I live in Ontario where we go down to -30C in the harshest conditions. We have a heat pump and a furnace and they alternate based on efficiency Somewhere around -5 to +5 C it switches from the heat pump to the furnace I think you could get by a bit colder but it really loses out on efficiency vs burning gas unless you invest in a geothermal heat pump
I live in Ontario where we go down to -30C in the harshest conditions.
We have a heat pump and a furnace and they alternate based on efficiency
Somewhere around -5 to +5 C it switches from the heat pump to the furnace
I think you could get by a bit colder but it really loses out on efficiency vs burning gas unless you invest in a geothermal heat pump