01/06/2025
When to Use Emergency Heat on Heat Pump? Heat pumps are efficient and versatile devices that can provide heating and cooling for your home. However, they may need to work better in extremely cold weather or when they are damaged or malfunctioning. In such cases, you may need to use the emergency heat setting on your thermostat to keep your home warm and comfortable. But what is emergency heat, and when should you use it? In this blog post, we will explain emergency heat, how it works, when to use it, and how to avoid using it unnecessarily. Emergency heat, also known as auxiliary heat or backup heat, is a secondary heating source that can supplement or replace your heat pump when it cannot provide enough heat for your home. Emergency heat is usually activated by a switch or a button on your thermostat, labeled as “EM HEAT,” “AUX HEAT,” or “BACKUP HEAT.” When you turn on the emergency heat, your heat pump will stop running, and your emergency heat source will take over.
How Does Emergency Heat Work?
Emergency heat bypasses the heat pump and uses the secondary heating source to heat your home. When you turn on the emergency heat, your thermostat will signal the heat pump to shut down and the emergency heat source to turn on. The emergency heat source will heat the air and distribute it to your home through the ductwork. The emergency heat will run until you manually turn it off or the thermostat reaches the desired temperature.
Emergency heat can be used in two ways: manually or automatically.
Manual emergency heat is when you turn it on yourself by pressing the switch or button on your thermostat. You may do this when your heat pump is malfunctioning or you want to warm up quickly. However, you should only use it in emergencies, such as when your heat pump is broken or frozen and you need heat until a technician can fix it. You should refrain from using it regularly, as it can waste energy and money and damage your system.
Automatic emergency heat is when it turns on by itself, without you pressing the switch or button on your thermostat. This may happen when the outside temperature is too low for your heat pump to work efficiently or when it is defrosting. In these cases, it will turn on temporarily to help the heat pump and keep the temperature. You do not need to do anything; it will turn off automatically when the temperature rises or defrosting ends.
When to Use Emergency Heat on Heat Pump?
Emergency heat should only be used in emergency situations when your heat pump cannot provide enough heat for your home. Some of the situations, when you may need to use emergency heat are:
Freezing temperatures In a heat pump, outside air is transferred to the interior. However, there isn’t enough heat for the pump to extract in below-freezing temperatures, causing it to struggle and run continuously without reaching the set temperature. This reduces efficiency and lifespan and increases energy bills. To supplement the heat pump and maintain warmth, use emergency heat when the outside temperature is below 25°F for a short period. Keep in mind that emergency heat can be costly and inefficient to run.
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