this post was submitted on 23 May 2025
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Last I read, which was years ago, was they still struggle under -20C. Which is not abnormal for many places in Canada. How do these perform in wicked cold times?
I have a heat pump and furnace combo. The heat pump works extremely well down to around -10C. Below that it takes a very long time to move the needle by half a degree. The furnace doesn’t kick in until the thermostat sees the house temperature trending in the opposite direction it’s attempting to achieve.
Unfortunately, its method of determining the time gradient of temperature is rather moronic and doesn’t take the temperature schedule into account. This means every morning when the schedule calls for higher daytime temperatures (even by just half a degree) the thermostat freaks out thinking that the house is cooling rapidly and kicks on the furnace to bring up the temperature.
This causes the system to needlessly run the furnace every single morning. It annoys the hell out of me but I don’t know what to do about it. Aftermarket thermostats aren’t very common around here (Canada).
I had a similar problem, fwiw I have an ecobee. I simply added an intermediary step an hour or two before the final temperature so the heatpump has a chance to go. There is also a threshold for auxiliary heat lock in the settings on the thermostat itself that doesn't show up in the app which I increased which helped a lot.
I tried the intermediate step and even the minimum possible temperature increase of half a degree still triggers the bad behaviour. I can’t find any auxiliary heat lock setting. Maybe it’s in the service menu set by the HVAC installers? They set a password on that and won’t tell me what it is.