I just had a new Bryant heat pump and propane furnance installed. So you were wondering, at what temperature is a heat pump not effective? Please click on this link to know more about this. For heatpump systems, its also crucial to know and set the minimum outdoor temperature that the heat pump can run with - otherwise the thermostat will lock out the heatpump and change over to aux heat as the weather outside will be too cold to run the heatpump unit that's sitting outside. Your Nest Thermostat will automatically switch to Eco Temperatures when nobody's home. The Eco Temperature ranges you can choose from … The Nest thermostat is compatible with these systems and supports up to 2 alternate heat sources. Nest 3rd gen model will turn ON the aux heat system only when it is necessary (only when the outside temperature falls below the aux heat lockout temperature). We have a 4,000 sq. Hello. Page 24 Heat Pump: Both auxiliary and compressor lockout temperatures can be changed in the Heat Pump section of the Advanced Settings menu. You can tell your Nest Thermostat exactly when it should turn on and at what temperature it should cool your house to. I want to use the Heat pump as much as possible. You have a dual fuel system if you have a furnace inside of your home, and a heat pump on the outside of your home. Whenever you see a green leaf and Eco on your Nest Thermostat or Nest app that means you are saving energy! I got several answers to this question during the bid process. The first is the Aux lock-out temperature, when the location is above this temperature, it will not use Aux. Thanks for reaching out. By default Nest will activate the heat pump balance, which then automatically determines the aux heat lockout temperature. An air-source heat pump releases air that's in … After the installation, the Nest thermostat won't let you test the cooling if outside temp is below 60F. Generally speaking, a natural gas furnace will release heat that's at least 120 degrees. By default, Nest will lock out the Setting compressor and auxiliary heater when the outdoor temperature is above 50°F but will not lock out auxiliary lockout temperatures the compressor at any temperature. Instead of generating higher-temperature heat in intermittent blasts, heat pumps generate lower-temperature heat continuously. When I moved in, the heat pump compressor lockout (thermostat setting 0350) was set at 35 degrees. Now I am wondering if it may be costing us more money than we are saving. I understand that in a typical operation, when the outside temperature goes low enough, the heat pump cannot produce much heat. We live near Louisville, KY and keep our thermostat at 69 during the day an 63 at night. When the temperature approaches 35 degrees, the heat pump runs less than 25% of the time, even at night. ft. house heated by two electric heat pumps with an electric coil backup. The installer set it at 40 which seemed high to me. Final Thoughts: At What Temperature is a Heat Pump Not Effective? Hopefully this article has helped answer that question, and any others about heat pump temperature ranges, and what you can do to improve heat pump performance when it gets below 25-30 degrees. Air-source heat pumps work on a novel principle: instead of directly producing the heat that you need to keep warm through the winter, the heat pump will find heat energy in the outside air and bring it into your home, using refrigerant as the medium of heat exchange.. What temp should the compressor lockout be set? If the customer has a heat pump system, they can change the lockout temperature on the thermostat. Also, both the heat pump and the electric backup run on very short cycles. 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