You can tell your Nest Thermostat exactly when it should turn on and at what temperature it should cool your house to. When I moved in, the heat pump compressor lockout (thermostat setting 0350) was set at 35 degrees. I want to use the Heat pump as much as possible. Now I am wondering if it may be costing us more money than we are saving. Generally speaking, a natural gas furnace will release heat that's at least 120 degrees. 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. What temp should the compressor lockout be set? There are two different lockout temperatures that are set on the Nest. While the Nest will learn your habits over time, many people prefer to have mostly-full control over the temperature of their living space. ft. house heated by two electric heat pumps with an electric coil backup. An air-source heat pump releases air that's in … Thanks for reaching out. The Eco Temperature ranges you can choose from … Hello. Also, both the heat pump and the electric backup run on very short cycles. If the customer has a heat pump system, they can change the lockout temperature on the thermostat. By default Nest will activate the heat pump balance, which then automatically determines the aux heat lockout temperature. Final Thoughts: At What Temperature is a Heat Pump Not Effective? We have a 4,000 sq. I just had a new Bryant heat pump and propane furnance installed. 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). So you were wondering, at what temperature is a heat pump not effective? 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. For the more old school among you, setting a schedule is a good option. I got several answers to this question during the bid process. Your Nest Thermostat will automatically switch to Eco Temperatures when nobody's home. Page 24 Heat Pump: Both auxiliary and compressor lockout temperatures can be changed in the Heat Pump section of the Advanced Settings menu. Heat pumps look similar to air conditioners, so check the label on your outdoor unit to make sure it’s a heat pump. Instead of generating higher-temperature heat in intermittent blasts, heat pumps generate lower-temperature heat continuously. When the temperature approaches 35 degrees, the heat pump runs less than 25% of the time, even at night. After the installation, the Nest thermostat won't let you test the cooling if outside temp is below 60F. The installer set it at 40 which seemed high to me. I understand that in a typical operation, when the outside temperature goes low enough, the heat pump cannot produce much heat. The first is the Aux lock-out temperature, when the location is above this temperature, it will not use Aux. The Nest thermostat is compatible with these systems and supports up to 2 alternate heat sources. Please click on this link to know more about this. 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. 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. 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