EM HEAT on Honeywell Thermostat – 2023

Understanding the EM Heat Function on Honeywell Thermostats

As a homeowner, you’ve probably encountered a time when your heating system wasn’t working as efficiently as it should. In these situations, you may have wished for a backup plan to keep your home warm and comfortable. Enter the EM Heat function on Honeywell thermostats. This feature is designed to provide emergency heating when your primary heating system is not functioning properly. In this article, we’ll explore the ins and outs of EM Heat and how it can benefit you.

The Importance of Emergency Heat in HVAC Systems

When your primary heating system fails, it can leave you in a cold and uncomfortable situation. Emergency heat, or EM Heat, is a secondary heating source that can be activated to keep your home warm until the primary system is repaired. This feature is especially important in colder climates, where a malfunctioning heating system can lead to dangerously low indoor temperatures.

How to Activate EM Heat on Your Honeywell Thermostat

Activating EM Heat on your Honeywell thermostat is a simple process. Here’s how to do it:

  1. Locate the “System” button on your thermostat’s control panel.
  2. Press the “System” button until the display shows “EM Heat.”
  3. The thermostat will now use the emergency heat source to maintain your desired temperature.

Remember, EM Heat should only be used when your primary heating system is not functioning properly. It is not intended for everyday use.

Troubleshooting Common EM Heat Issues with Honeywell Thermostats

Sometimes, you may encounter issues when trying to activate EM Heat on your Honeywell thermostat. Here are some common problems and their solutions:

  1. EM Heat is not turning on: Ensure that your thermostat is set to “EM Heat” mode and that your secondary heating source is functioning properly.
  2. EM Heat is not providing enough warmth: Check your secondary heating source for any issues, and ensure that your thermostat is set to the correct temperature.
  3. EM Heat is running constantly: This may indicate a problem with your primary heating system. Contact a professional to diagnose and repair the issue.

Energy Efficiency Tips: Using EM Heat Responsibly

While EM Heat is a valuable feature, it’s important to use it responsibly to avoid wasting energy. Here are some tips for energy-efficient use of EM Heat:

  1. Only use EM Heat when your primary heating system is not functioning properly.
  2. Set your thermostat to a reasonable temperature, typically between 68-72°F (20-22°C).
  3. Regularly maintain your primary heating system to minimize the need for EM Heat.

Comparing Honeywell Thermostat Models

Honeywell offers a wide range of thermostat models, each with different features and capabilities. When choosing a thermostat, consider factors such as your home’s heating system, your desired level of control, and your budget. Some popular Honeywell thermostat models with EM Heat functionality include the T5, T6, and T9 models.

The Role of Smart Technology in Honeywell Thermostat EM Heat Settings

Smart technology is becoming increasingly popular in thermostats, and Honeywell is no exception. Many Honeywell thermostats with EM Heat functionality also offer smart features, such as remote control via a smartphone app, geofencing, and integration with smart home systems. These features can help you monitor and control your home’s heating system more efficiently, even when using EM Heat.

A Step-by-Step Guide to Honeywell Thermostat EM Heat Installation

Installing a Honeywell thermostat with EM Heat functionality is a relatively straightforward process. However, if you’re not comfortable working with electrical wiring, it’s best to hire a professional to handle the installation. Here’s a general overview of the installation process:

  1. Turn off power to your HVAC system.
  2. Remove your old thermostat, taking note of the wiring connections.
  3. Install the new Honeywell thermostat, following the manufacturer’s instructions for wiring.
  4. Turn the power back on and test the thermostat, including the EM Heat function.

Frequently Asked Questions

How do I know when to use EM Heat?

EM Heat should be used when your primary heating system is not functioning properly and cannot maintain a comfortable indoor temperature.

Is EM Heat more expensive to run than my primary heating system?

In most cases, yes. EM Heat is typically less energy-efficient than your primary heating system, so it’s best to use it only when necessary.

Can I use EM Heat with any type of heating system?

EM Heat is compatible with most types of heating systems, including gas, oil, and electric. However, it’s important to consult your thermostat’s user manual to ensure compatibility with your specific system.


In conclusion, the EM Heat function on Honeywell thermostats is a valuable feature that can provide emergency heating when your primary system is not functioning properly. By understanding how to activate and troubleshoot EM Heat, as well as using it responsibly, you can ensure that your home stays warm and comfortable even in the face of heating system issues.

Leave a Comment