Mildly Infuriating
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Heat pumps aren't designed to function in this low of temperature. The problem is they need a real heater instead of a heat exchanger.
This is such an outdated information. Modern heatpumps work just fine even in temperatures of -20C and below. Ofcourse the efficiency gets worse the colder it is but even at worst it's still 100% efficient. On a typical year there's only a handful of really cold days. It doesn't make sense not to get a heatpump just because it's inefficient for few days. It's not like it stops heating or something. It just effectively turns into electric radiator which is what my house was heated with before I got the heatpump anyways.
I live in a very cold part of the world where the temps can easily exceed your -20C for night times for several weeks at a time. And even as the daily high for a week stretch or two over a winter. And while I could have purchased a heat pump that would work to that low of a temperature, it would have cost over twice the price. Going from $5000US installed to over $10,000US for just the heat pump. And that included the rebate incentives.
My heat pump is set to set to cut out and switch to LP heat at -10C because it becomes cheaper to run an LP furnace at that point - cost of electricity = 6.5 cents per kilowatt hour vs $1.75US gallon LP. The loss of efficiency matters to my pocket book. And I chose my particular heat pump with my advice of my Daughter who has a PhD in ME and works as a research engineer for a non-profit studying HVAC systems and the efficiencies of the technology used in them. And she won't install a heat pump in her house because for where she lives, they literally do not make financial sense. There is zero savings to be had with switching from natural gas heat to electric.
So installing a heat pump is not a universal no brainer. You still need to to the math to see if it pays.
In very cold climates, having a hybrid system like the one you're describing is that universal no brainer in my opinion. Especially since most cold regions also typically have really long transitional periods where your heat pump is most efficient and pays itself off fastest. Combining that with turning it off during harsh winter weeks gives you the best of both worlds.
It's not even a no brainer even then. You absolutely need to actually do the math for your particular situation to make that determination. For me it works out. For my neighbor down the road who is a logger, it does not. He can harvest, process, and store 2 years worth of firewood in a mere handful of hours. Any other heat source makes little sense for him.
You really, really, really need to do the math!