We are experiencing lower than usual remperatures -10 C to - 20 C with wind chil factures. Usually my heat pump turns on to assist the furnace at temperatures usually down to - 0 C to -5 C but has not turned on for the last few days at colder temperatures. Is this usual or should I be getting someone to check the system? System is almost 3 years old.
I am not an HVAC guy but I think that it is usually the reverse. The furnace is the secondary heat source and should come on when the heat pump ( primary heat source) is unable to keep up because the outside temps are too low to operate efficiently. If it is actually working in reverse - furnace primary and heat pump is secondary - you should have your system and controls looked at by a pro and reprogrammed.
You could put this in the "post your project" section and get some local responses.
Hopefully, some heating guys are on the site and can chip in with more info.
Good Luck with it!
Kettleby Handyman Services
Jim is correct. The heat pump does the majority of your heat until weather conditions force it to shut down. At certain temperatures the heat pump can no longer draw heat from the outside air. So then your furnance kicks in. I am surprised that the installers never brought you up to speed on that. However, sounds like it is responding as it should. But any doubts you should be able to contact the installer to confirm all is ok.
Hope this helps.
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