How old was the unit? I've been out of the loop for a while, so I don't know if they're out there yet, but a while back - probably about ten years - I read an article about new heat pump tech that was allowing heat pumps to work at far colder temperatures. I might have posted something about that here. Check the archives.
source https://www.inspectorsjournal.com/topic/18827-quick-heat-pump-help-please/?do=findComment&comment=172314
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