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Replace Honeywell Thermostat Battery
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Replace Thermostat Battery Honeywell

This guide will show you how to change the battery on a Honeywell thermostat. The process is pretty simple and doesn't take much time, but knowing what type of batteries your thermostat needs and what tools you'll need beforehand can be helpful.

Check out our other guides if you're interested in learning how to replace your air conditioner's filter or perform some other minor maintenance task on your HVAC system.

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Flip your thermostat to OFF.

Remove the thermostat cover.

If you're replacing a battery for an older model Honeywell thermostat, this step may be unnecessary depending on how long ago it was installed

—but if not, do not skip this step unless someone has already told you otherwise.

If unsure about what type of battery needs changing out, just chat with HVAC online, so we can help troubleshoot further.

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Remove the old battery from your thermostat.

If your thermostat has a cover that can be removed, remove it to access the batteries.

If your thermostat doesn't have a removable cover, look for small screws around the perimeter of the device that you can unscrew to open it up.

Once you've accessed your thermostat's batteries, check which type they are. Most Honeywell models use AA or AAA alkaline batteries, but some older models may require lithium batteries (which are usually more expensive).

Insert new batteries into each slot and ensure they're in securely before replacing any covers or panels on your thermostats.

Turn your system back on after repairing or replacing its battery, and enjoy convenient temperature control once again.

Insert new batteries and reinstall the thermostat cover.
If this doesn't work—if you're having trouble getting your cover to click back together—it might be because there's another piece blocking access:

Your old batteries could have been dislodged when replacing them with their opposites (positive/negative), for example, which would prevent them from snapping back into place properly if you were trying to reassemble them incorrectly.

In this case, try again after removing any obstructions from inside or around their housing so that everything is free and clear before reattempting installation!

Turn your thermostat back on again.
To turn the thermostat back on, simply twist it to the right until it clicks. Once it's on, you can set your temperature to a comfortable level.

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Air Conditioner Repair How To
Air conditioner repair is identifying and resolving issues with your air conditioner. There are a couple of things that you should do to repair an air conditioner.

First, you should check if the problem is with your thermostat or not. If it’s not working correctly, you can try fixing it before replacing it with a new one.

Second, find out what issue has been causing problems on your unit, like low refrigerant levels or dirty filters, so that you can solve them quickly instead of buying another one that might not work well too.

Thirdly, call up professionals who already have experience in repairing units like Honeywell Thermostats or Carrier HVAC systems so that they can help resolve whatever issue might be there without any trouble.


When it comes to heating, ventilation, and air conditioning, HVAC is an acronym that stands for "heating," "ventilation," and "air conditioning."

HVAC is an essential component of your home's overall comfort. If your HVAC isn't working correctly, you may experience excessive cold or heat problems.

You might also have trouble sleeping at night because the temperature setting isn't comfortable enough for you.

Because no one likes to deal with these issues, homeowners need to be able to resolve them on their own if possible.

Fortunately, many resources available can help you diagnose potential problems with your HVAC system so that they don't become a nuisance going forward.

HVAC chat with a pro to learn more about how to repair your air conditioner, furnace, or thermostat.

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Your first step is to make sure you have everything you need. It's generally a good idea to make sure you have a replacement part before attempting any repairs or replacements, and while this might seem obvious, you must do so.

Then, read the instructions carefully to know how to replace your thermostat battery.

If at any point during this process something doesn't make sense or if it feels too complicated for your skill level, get help from a pro who knows how to guide your HVAC DIY repair.

Your Honeywell Thermostat will be up and running when you're done.

After removing the cover, you’ll be able to access the thermostat’s battery and see that it is clearly labeled “Battery.”

If your thermostat does not have an easily accessible battery, you may need to remove a few screws to access it.

If you don't have a small screwdriver on hand, you can use another flat piece of metal or a butter knife (so long as it'll fit between the battery compartment and its casing).

Just be sure not to force anything other than something specifically designed for this job—you could damage your thermostat if something breaks inside.
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