Different systems and thermostats have different methods of determining when to activate this secondary source. ![]() ![]() The second heating stage is designed to be a supplemental source of heat when the temperature is too low for your heat pump to extract heat from the outside. The primary heat pump is usually located outside of the house, while the second stage heating source is inside. How Does EM Heat Work?Īs we mentioned above, homes with heat pumps come with a two-part system: the heat pump and the auxiliary heating source. This is way less efficient than your primary heating system, so you should only use it in real emergencies unless you want to pay exorbitant heating bills. Now, instead of working with your main heat pump, your backup is working solo. However, if you turn on your EM heat manually, you begin drawing heat only from the secondary source. In colder climates (below 35° Fahrenheit), all heat pumps need a secondary heating source because your heater taps into this setting when outside temperatures drop too low. Most systems have a heat pump as its primary setting and activate their secondary (gas, oil, or electric) heating when supplemental, or second-stage, heating is required. If you have an emergency heat thermostat setting, you likely have a heat pump, as well as a gas, oil, electric, or hot-water back-up system. What is EM heat on thermostat settings? Short for “ emergency heat,” it is a setting that controls your home’s back-up heating system. That’s why we’ve created this guide on EM Heat, so you know the appropriate way to use a heat pump in your home. No matter the circumstance, you should understand your home appliances’ settings before you mess with them. So, you don’t want to go switching it on without knowing what you’re doing. ![]() “EM” stands for emergency, and this secondary heating system is a back-up to keep your house warm when your primary heat fails. All regular thermostats have a special setting labeled “ EM heat.” But what is it? Many people falsely assuming it’s a setting for you to switch on during freezing temperatures.
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