I have a new Carrier heat pump with a variable speed fan and computer controlled thermostat. I am located outside northeast Phila.. At about what temp does the heat pump switch over to its back up heat system. I was under the impression that it would switch over at around 32 degrees or so but even though we have had that type of weather, it has never switched over to back up heat.
With the new heater I decided to try a propane back up. I was never really satisfied with the elec. back up. Thank you for your help with this question.
Heat pumps were designed for climates with so called "mild" winters. They are most efficient when temps rarely fall below 40 degrees. They are also not the easiest types of systems to troubleshoot. Contact the installer and ask him what he can do to make it right. Look in the user manual under "troubleshooting" to see what is says about really cold temps.
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