How to Replace Thermostat Batteries?

Batteries are the most important components of your thermostat. They power all of its features and help control the temperature in your home. If you notice that your thermostat is not working properly, then it may be time to replace the batteries. It is essential to know when they need replacing. This blog post will tell you everything you need to know about how to change out the batteries of a thermostat.

How to replace thermostat batteries?

A faulty thermostat is a common problem in any season. Maintaining the right temperature at home is important because it could lead to big emergencies if not correctly maintained. To maintain a healthy and comfortable temperature in your home, it is important to fix any problems with the thermostat.

Changing thermostat batteries is a great way to save money, especially if you have an older model at home. Here are some procedures for changing batteries in common thermostats.

Honeywell Round Thermostat

Step 1: Remove the battery compartment on a Honeywell thermostat by pushing the tab at the top of it. Then pull gently to slide out and access it. The battery compartment for a Honeywell thermostat is on the device’s side.

Step 2: Remove the old batteries from the thermostat. Since you are not sure which one is causing the problem, it’s best to remove both batteries at once. Two AAA batteries are required for the compartment.

Step 3: Replace the old batteries with new ones while paying careful attention to the required orientation of your batteries. The positive and negative sides should be facing in their respective directions, or else you risk damaging your thermostats when they are plugged back in.

Step 4: With the new batteries inserted, slide the compartment back into place. This time bottom first and then push to snap it shut.

Basic Honeywell Thermostat

Step 1: Remove the entire plate to expose the battery compartment. Look for a little handle near the bottom to assist you split the plates.

Step 2: The batteries are located on top of the front plate. Remove the old batteries and replace them with new ones.

Step 3:Once the batteries are changed, realign the plates back together and press down firmly.

Touchscreen Honeywell Thermostat

Step 1: This type of thermostat has a button at the top of the device. This button will help you open the plates easily by pressing it.

Step 2: Locate the old batteries at the top of the front plate and then replace them with new batteries.

Step 3: Return the front plate to the backplate by first sliding the little notches at the bottom of the front plate that should go into the holes of the backplate. Once everything is properly aligned, close up the plates.

Basic Emerson Thermostat

Step 1: To split up the cover of an Emerson Thermostat, you have to find the little handle at the lower portion at the back of the device.

Step 2: Pull off the old batteries from their compartment at the backplate of the device carefully, then insert new ones into place.

Step 3: Reattach the front cover to the backplate, then push and snap into place for a snug fit.

Touchscreen Emerson Thermostat

Step 1: The casing of this touchscreen Emerson thermostat is quite different from the rest as the cover does not split in half. Instead, look for a small handle at the back of the device to pull it off with care.

Step 2: The battery compartment for this device is attached to the front plate. Remove the old ones and replace them with a new set of batteries.

Step 3: Realign the back case with the front plate and press down firmly to snap it into place.

How to identify if the thermostat has bad batteries?

You can identify whether the thermostat has bad batteries if the thermostat is not displaying any information, not showing times and dates, or if it’s displaying all zeros.

To some thermostats, you’ll see a black display screen on your thermostat when the batteries die. The heating and cooling units won’t function when this happens, nor can they respond to nonexistent temperature commands.

A low battery can be an early sign and may produce a variety of strange temperature readings on the thermostat. This could create an incorrect room temperature or even stop working entirely because of a failing battery.

How long do the batteries of the thermostat last?

Batteries on a thermostat are generally expected to last 8-12 months. A common problem people experience is that their heating and cooling system at home stops working when low batteries are present. This can be a result of an issue or failure with your thermostat, which could lead to higher power bills than desired as well if it continues long term.

Monitor your batteries to ensure they are working properly. It is best to change the batteries once a year or when the low battery indicator appears.


Thermostats are a vital part of the HVAC system and need to be functioning at peak efficiency. When batteries in your thermostat die, it can cause issues with how well they regulate the temperature throughout your home or office space.

Luckily, you no longer need to worry about this problem as long as you know when high-quality batteries for thermostats will expire and replace them before that time comes. This way, you will avoid any sudden or unexpected temperature changes.

A good rule of thumb is to change batteries every twelve months if you live in an area where temperatures fluctuate significantly during the year and every six months if you live somewhere with any major seasonal changes. Keep all these tips handy, so that the next time someone asks, “How do I change my thermostat battery?” you can answer them without hesitation.

About the author, Phil Borges

Phil Borges is a battery aficionado. He's written extensively about batteries, and he loves nothing more than discussing the latest innovations in the industry. He has a deep understanding of how batteries work, and he's always on the lookout for new ways to improve their performance.