What is the temperature difference between the 1st and 2nd bulbs for heating on a heat pump thermostat?

In a heat pump thermostat, the temperature difference between the first and second bulbs for the heating mode typically is approximately 2°F. This temperature differential is essential for the proper functioning of the thermostat and helps ensure efficient operation of the heat pump system.

The first bulb generally senses the ambient temperature, while the second bulb is used to provide feedback about the heating cycle. The 2°F difference allows the thermostat to avoid rapid cycling on and off, which can lead to inefficiencies and wear on the heat pump system. This minor range ensures the system maintains a comfortable space without unnecessary energy consumption or temperature fluctuations. Understanding this temperature differential helps technicians and users optimize the performance of heat pumps and maintain a stable indoor environment.