Do All Thermostats Have Batteries? 

If you recently got a thermostat for your home, you’ll naturally wonder how to power one. Modern technologies have made thermostats more efficient than before. Therefore, thermostat batteries do not merely power the device. 

Instead, their functionality extends beyond that. For instance, a few batteries store energy and work as a backup source during power outages. But do all thermostats feature batteries?

All thermostats do not have batteries, and some popular ones include the Wyze Smart Wi-Fi Thermostat, Honeywell Thermostat, and Google Nest Learning Thermostat. 

However, that does not indicate thermostats working without batteries compromise performance. 

Do Thermostats Work Without Batteries? 

A few modern thermostats hardwired with your property’s circuit can function without batteries. They might, however, include battery slots where batteries are a secondary power source, providing energy during power outages. 

Popular thermostats that work without batteries include: 

  1. Wyze Wi-Fi Thermostat 
  • Works with Google Assistant and Alexa
  • Needs a C cable 
  • Allows you to access it remotely via an app
  1. Honeywell Thermostat
  • It needs a C cable 
  • Offers personalized programs to align with your needs 
  • Easy operation 
  1. Google Nest Learning Thermostat 
  • Self learns your schedule 
  • Allows remote access via the Nest app 
  • Shows the energy-saving temperature 
  1. Ecobee Lite Smart Thermostat 
  • Saves HVAC bills yearly 
  • It needs a C cable 
  • Allows remote control via the Ecobee app

How Long Does a Thermostat Battery Lasts? 

How long a thermostat battery lasts depends on numerous factors. A few brands manufacture quality batteries that are bound to last longer than others. Further, the age of the thermostat also counts.

The older thermostat models need more energy than newer versions. However, expect your thermostat battery to last for 9-13 months. 

Nonetheless, we recommend keeping a set of new batteries handy. The moment you spot signs of a faulty or depleting battery, replace it instantly.  

Guide to Honeywell Thermostat Battery Replacement

How to Know a Thermostat Requires A Battery Replacement? 

A digital thermostat typically works either with the batteries or hard-wired to a C wire. It can, however, be a combination of both. 

Typically, thermostats function on a hybrid system that uses direct electricity. However, in the event of power outages, it shifts to the battery. 

Thermostats featuring such hybrid systems generally do not show a low battery alert when batteries start draining. So, it can be a little tricky to spot a depleting battery if you do not know how to go about it. 

Look out for these common signs. 

  • Blank display 
  • Unusual characters on the display 
  • Umprogrammable thermostat or HVAC unit. 
  • Unexpectedly reduced performance of the furnace or AC unit 

Thankfully, advanced technologies have shifted how things work. You can now set up low battery alerts on your thermostats. This will inform you about battery changes through email or message notifications. 

Pros recommend replacing the batteries soon after they drain. Otherwise, they’ll take a toll on your HVAC unit’s performance. 

Another quick method to know about battery changes is to skim through the thermostat’s user manual quickly. 

Lastly, an annual battery replacement is ideal for keeping the thermostat working efficiently. 

Which Batteries Go Inside a Thermostat? 

Regardless of the battery you choose for the thermostat, it is meant to drain by the end of the day. However, thermostats typically operate on AAA alkaline or AA batteries. A few devices also work with lithium batteries. 

Nonetheless, it is best to use the battery type and size per the manufacturer’s recommendation. You can easily find the information regarding battery type in the instruction manual. 

How to Change a Thermostat Battery?

If you want to keep your thermostat up and running, it is better to consider a battery replacement yearly. We already mentioned a few tell-tale signs to spot a draining battery. 

If you come across any of those, it’s time to replace the battery.

You do not need to call an expert for that purpose. Instead, you can easily do it yourself. Note that the replacement steps battery per the thermostat type and model. However, we’ll share general guidelines that’ll come in handy regardless of the version you own. 

  • Read the manual. Make sure you read the instruction manual to understand the unique process that goes into your thermostat battery replacement. 
  • Get your tools. You’d need a small flat screwdriver to open the thermostat housing. Make sure you keep it and other tools within your reach before starting the replacement process. 
  • Purchase the batteries. Skimming through the user manual will give you an insight into what battery goes into your thermostat. Make sure you buy the correct battery type. Otherwise, your thermostat won’t work. Common battery types include AAA alkaline, AA, or Lithium batteries. 
  • Change the battery. Cautiously remove the housing to change the thermostat’s battery. Follow the steps below. 
  1. Carefully inspect the battery slots. 
  2. Pull off the old batteries using a screwdriver. Be careful not to damage the thermostat’s compartments at this point. 
  3. Add new batteries to the slot and close the housing 
  4. Install the appliance back to its position 

On a side note, always use newly bought batteries for your thermostat. Adding old batteries might damage the thermostat components. Further, it may change the temperature settings. 

This temperature alteration hinders energy consumption. Consequently, your energy bills will skyrocket. 

So, investing in a new battery is better than spending more money on electricity bills. 

Nest Thermostat Low Battery: How to Troubleshoot

How to Reset a Thermostat After Changing the Battery?

Generally, you do not need to reset the thermostat after replacing its battery. Your thermostat automatically loses power once you remove the old battery; as soon as you install the new one, the thermostat powers up again. 

Upon powering up, the device resets automatically. So, you do not need to do anything. Nonetheless, a few units featuring a reset button might require an effort at your end. 

You need to press the reset button for a few seconds to restart the device. You can always check the user manual to find the button’s location. 

What’s the Reason Behind a Failing Thermostat Battery?

If your newly installed thermostat batteries keep dying, there must be an underlying issue. Malfunctioning and old thermostats drain more battery than they actually should. So, if you own an old thermostat, it’s better to replace it with a new version. 

Further, a faulty HVAC system can be the culprit, too. Malfunctioning HVAC units overwork your thermostat batteries. Consequently, the life expectancy of your batteries reduce. 

Call in a professional to get a quick HVAC inspection if you sense it’s causing the problem. The quicker you take action, the sooner you’ll avoid thermostat battery issues. 

What’s Thermostat Energy Backup & Why Is It Required?

As stated earlier, a thermostat battery does more than just power your device. They also act as secondary power sources like a UPS stores energy to give it back during power outages. 

The thermostat saves the program and keeps you from resetting the device time and again. So, even if the settings get removed during unprecedented times, you would not need to set the program. 

Selecting the energy-efficient settings from your thermostat can get challenging. Batteries, however, save you from such cumbersome tasks and maximize your convenience. 

A thermostat without a battery backup doesn’t work that efficiently. It gives incorrect readings and also affects the time and temperature settings of the gadget. 

Even worse, it hikes the energy costs due to reduced efficiency, reversing the idea of why you installed a smart thermostat in your home, to begin with.  

When to Replace Thermostat Batteries?  

Batteries do not need replacements only when you spot they are draining. Instead, you can go for a replacement even without a low battery alert. This will keep your thermostat running efficiently and help avoid potential problems. 

To begin with, consider a thermostat battery replacement at the start of every new season. This will keep you from issues concerning adequate cooling or heating. 

Further, if you plan to go on a business or family vacation, you must replace the batteries before leaving. This will avoid unexpected battery issues on your return. 

What Does a Thermostat Blank Display Indicate? 

A blank thermostat display signifies a dead battery. Failing batteries will make your device unusable. As such, you’ll fail to control your HVAC system. 

What’s worse, you lose the pre-programmed settings – more trouble for you. 

At this point, you have no choice but to replace the batteries. Maintaining a thermostat is crucial to your HVAC system’s optimal functioning. 

Is It Important to Call a Professional for a Battery Replacement? 

A few homeowners hold back from battery replacements because they believe it’s a professional’s job. However, that’s not the case. In fact, replacing a battery is a walk in the park – so long as you follow the correct instructions. 

So, you do not need to call in a professional. Instead, you can DIY it. 

Closing Notes 

Batteries fuel your thermostats and ensure their proper functioning. Even when using hard-wired thermostats, it is better to add a battery as a second power source. 

It’ll keep you from reprogramming your appliance after power outages. Further, replacing batteries every new season ensures optimal device maintenance. 

If you aren’t sure how to go about it, our explanation above will help 

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