Have you ever glanced at your thermostat on a chilly day and seen the letters “EM”? This indicator is short for emergency heat, and can be scary to see, but we’ve put together a guide so you know exactly what to do. This guide will explain what emergency heat is, when it’s used, and how to manage it correctly.
What Is Emergency Heat?
Emergency heat, or “EM heat,” is a secondary heating source built into your heat pump system. A heat pump moves heat from one place to another. In your home, it pulls heat from the outside air. However, when outdoor temperatures drop very low, typically below freezing, the heat pump struggles to extract enough heat to keep your home comfortable.
This is when emergency heat kicks in. Your heating system will activate an auxiliary heating element, usually electric resistance strips (similar to the coils in a toaster), to provide the extra warmth your home needs. Think of it as a powerful backup heater that steps up when your primary system can’t keep up with extreme cold.
When Does EM Heat Turn On?
The emergency heat setting isn’t something you’ll need to use often, but it’s crucial when you do. Here are the common situations when it might activate:
- Extreme Cold: The most common trigger is when the outside temperature drops so low that your heat pump can’t efficiently warm your home. Your system may automatically switch to EM heat to supplement its performance.
- Defrost Mode: When ice forms on the outdoor unit of your heat pump, it will enter a “defrost mode.” During this cycle, the system temporarily reverses to melt the ice, and the emergency heat turns on to prevent cold air from blowing inside your home.
- System Malfunction: If the primary heat pump components fail, the emergency heat can serve as your sole source of heating until a professional can perform repairs.
In rare cases, you might need to turn on the emergency heat manually. If you notice your heat pump is running but not producing warm air, or if you suspect a problem with the outdoor unit, switching to emergency heat can keep your home warm while you wait for a service call.
Your EM Heat Is Extremely Important to Maintain
Having a reliable backup heating source is essential for your comfort and your HVAC system’s health. During a severe cold snap, the emergency heat function ensures your family stays warm even when your heat pump is struggling against freezing temperatures.
Furthermore, this backup system helps protect your heat pump from potential damage. Taking over during extreme conditions or defrost cycles reduces strain on the compressor and other components. This prevents overwork that could lead to costly system failures and extends the lifespan of your heat pump.
Tips for Using EM Heat Safely and Efficiently
While emergency heat is a valuable feature, it’s also less energy-efficient and more expensive to run than your standard heat pump. Here are a few tips to manage it effectively.
Avoid Running It for Long Periods
Because it typically relies on electric resistance strips, using emergency heat can significantly increase your utility bills. Use it only when necessary and switch back to your normal heat pump setting as soon as temperatures rise or after a technician resolves any system issues.
Check Your Thermostat Settings
Accidentally leaving your thermostat on the “EM Heat” setting is a common mistake that can lead to surprisingly high energy costs. Always double-check that your system is set to “Heat” or “Auto” for normal operation.
Schedule Regular Maintenance
The best way to ensure your entire heating system works correctly is through regular professional maintenance. An HVAC technician can inspect your heat pump, clean its components, and test the emergency heat function to confirm everything is ready for winter.
When to Call a Professional
If you notice your emergency heat light is on frequently or stays on for extended periods, it’s a clear sign that something is wrong. This could indicate that your heat pump is malfunctioning, undersized for your home, or in need of service. Without professional help, you may face higher energy bills and a complete system breakdown.
Don’t wait for the problem to get worse. Call a qualified technician to diagnose the root cause if you see these signs!
Get Expert Help from Triad Mechanical
If you’re having issues with your heat pump or your emergency heat won’t turn off, it’s time to call in the experts. The certified technicians at Triad Mechanical have been providing exceptional heating services for over two decades.
We also offer installation, repair, and maintenance for all types of heating systems. We’re ready to ensure your family stays warm and comfortable all winter long! Call us today for more information.