If you take a look at the thermostat that controls your home’s heating and cooling systems, you might notice a switch or button labeled “EM heat.” If you see this, your home probably has a heat pump. The first part of the phrase “EM heat” stands for emergency. The emergency heat setting on your thermostat controls your heating system’s auxiliary heat source, which can be tapped into when outside temperatures drop below a certain threshold—usually anything colder than 35 to 40 degrees Fahrenheit. Now that you understand the answer to the original question—What is EM heat on a thermostat?—let’s learn more about this setting and why it comes on.
When functioning properly, the heating system’s heat pump pushes warm air from inside your home to the outside during hot weather and moves heat to the inside during cold weather. When outdoor temperatures drop into the thirties, however, it can become too … Read Full Post »