I got several answers to this question during the bid process. After the installation, the Nest thermostat won't let you test the cooling if outside temp is below 60F. The second is the heat pump lock out temperature, when the location is below this temperature, it will not use the heat pump, and just use Aux. While the Nest will learn your habits over time, many people prefer to have mostly-full control over the temperature of their living space. What temp should the compressor lockout be set? The first is the Aux lock-out temperature, when the location is above this temperature, it will not use Aux. When the temperature approaches 35 degrees, the heat pump runs less than 25% of the time, even at night. We live near Louisville, KY and keep our thermostat at 69 during the day an 63 at night. By default Nest will activate the heat pump balance, which then automatically determines the aux heat lockout temperature. I just had a new Bryant heat pump and propane furnance installed. If the customer has a heat pump system, they can change the lockout temperature on the thermostat. Instead of generating higher-temperature heat in intermittent blasts, heat pumps generate lower-temperature heat continuously. Heat pumps look similar to air conditioners, so check the label on your outdoor unit to make sure it’s a heat pump. Page 24 Heat Pump: Both auxiliary and compressor lockout temperatures can be changed in the Heat Pump section of the Advanced Settings menu. 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. There are two different lockout temperatures that are set on the Nest. I understand that in a typical operation, when the outside temperature goes low enough, the heat pump cannot produce much heat. Your Nest Thermostat will automatically switch to Eco Temperatures when nobody's home. The Eco Temperature ranges you can choose from … Generally speaking, a natural gas furnace will release heat that's at least 120 degrees. The Nest thermostat is compatible with these systems and supports up to 2 alternate heat sources. 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. You can tell your Nest Thermostat exactly when it should turn on and at what temperature it should cool your house to. Whenever you see a green leaf and Eco on your Nest Thermostat or Nest app that means you are saving energy! 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.. 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). 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. Please click on this link to know more about this. Thanks for reaching out. For the more old school among you, setting a schedule is a good option. Hello. The installer set it at 40 which seemed high to me. So you were wondering, at what temperature is a heat pump not effective? 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. Also, both the heat pump and the electric backup run on very short cycles. We have a 4,000 sq. 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