How to Lock Your Old Thermostat: Keep Your Home Comfortable (Updated 2023)

Locking your thermostat is simple and only requires a few tools. First, you’ll need to purchase a special locking device – these can be purchased from most hardware stores or online. Afterward, turn off the power to your thermostat before removing the cover plate and disconnecting the battery connectors. 

Next, attach the lock and replace the cover plate. Once that’s done, simply turn on the power again and you’re all set! From this point on, anyone who wishes to change your thermostat settings will need to possess a key in order to do so. With this DIY project finished, you can rest assured that your home remains comfortable throughout the day without any unwelcome changes.

What is Thermostat Locking?

If you’ve ever gone to adjust your home’s thermostat only to find that someone has locked it, you may be wondering what thermostat locking is and why someone would do it. 

Thermostat locking is a feature on some models of thermostats that allows the user to lock the device so that no one can change the settings. 

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This can be useful in a number of situations, such as when you want to prevent small children from changing the temperature or if you have roommates who tend to adjust the thermostat without your permission. 

In this article, we’ll discuss what thermostat locking is, how to lock your old thermostat, and how to unlock it if you need to.

Overview of Different Types of Thermostat Locking Solutions

The number of Americans that are working from home has increased dramatically in recent years. This means that people are relying on their thermostats to keep their homes comfortable, and they want to know how to lock their old thermostat so that it doesn’t get accidentally changed.

There are a few different types of thermostat locking solutions available on the market. 

Physical lock

The most common type is a physical lock that goes over the thermostat itself. This type of lock is usually very effective, but it can be difficult to install if you don’t have the right kind of screwdriver.

Software-based solution

Another type of thermostat locking solution is a software-based solution. This type of solution usually requires you to install a piece of software on your computer or phone that will then prevent anyone else from changing the settings on your thermostat. 

This can be a more convenient option if you’re not comfortable with installing a physical lock, but it’s important to make sure that you choose a reputable software provider.

Smart thermostats

There are also some smart thermostats that come with built-in locks. These locks can be activated through an app or website, and they’ll prevent anyone else from changing the temperature in your home. 

This is often the most convenient option, but it’s important to make sure that your smart thermostat is compatible with your particular brand of heating and cooling system.

Benefits of Using a Locked Thermostat

Prevent accidental or unauthorized changes

One of the benefits of using a locked thermostat is that it can help to prevent accidental or unauthorized changes to the temperature settings. This can be important in ensuring that the temperature remains consistent and comfortable, especially in homes with small children or pets. 

Additionally, locked thermostats can also help to deter would-be thieves or vandals from tampering with the device. 

Help a homeowner conserve energy

Another benefit of using a locked thermostat is that it can help a homeowner conserve energy. When the temperature setting cannot be changed without permission, homeowners are more likely to keep their thermostat in an optimal setting and adjust it only when necessary. This can result in lower energy bills and improved energy efficiency.

How to Lock Old Thermostat Models

If your home has an old thermostat, you may not be able to lock it. In this case, you’ll need to replace it with a new one. 

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But if your old thermostat is still in good working condition, you can lock it by following these steps:

  • Locate the set screws on the front of the thermostat. These are usually located near the bottom of the unit.
  • Use a flathead screwdriver to loosen the set screws.
  • Remove the front cover of the thermostat.
  • Find the locking mechanism inside the unit (this may be a small switch or a sliding tab). Flip or slide this mechanism into the locked position.
  • Replace the front cover and tighten the set screws back into place. 

That’s all there is to it! Your old thermostat should now be locked, helping you keep the temperature in your home set to your desired level.

How to Set Up a Locked Schedule for Your Home’s Temperature

In order to keep your home’s temperature locked, you’ll need to set up a schedule for your old thermostat. You can do this by following these simple steps:

  • First, identify the desired temperature for each time of day that you want the temperature locked. For example, you may want the temperature to be cooler at night and warmer during the day.
  • Next, use a marker or pen to write down the temperatures on a piece of paper or whiteboard. Make sure that you clearly label the times of day next to each temperature.
  • Once you have your temperatures and times of day written down, find the “Lock” button on your old thermostat. This button is usually located on the side or back of the thermostat.
  • Press and hold the “Lock” button for three seconds until you hear a beep or see a message that indicates that the schedule is locked. If you’re not sure how to lock your particular model of thermostat, consult your owner’s manual for instructions.
  • That’s it! Your home’s temperature will now be locked according to the schedule that you set up. If you ever need to change the schedule, simply repeat these steps with new temperatures and times of day.

Tips for Effective Thermostat Use

If you have an older thermostat, you may not be able to lock it. But there are still some things you can do to keep your home comfortable: 

  • Make sure the batteries are fresh so the system doesn’t have to work harder than necessary
  • Clean and dust the unit regularly so that air can flow freely through it.
  • Keep furniture and drapes away from the unit so that it isn’t blocked.

By following these tips, you can help ensure that your old thermostat continues to work effectively.


Is it possible to lock a thermostat?

It’s possible to lock a thermostat, but doing so may not be the best idea. If you have an old thermostat, it might not have a locking feature. Or, if it does have a locking feature, it might not work properly. Also, if you accidentally lock your thermostat, you might not be able to unlock it.

Can you child lock a thermostat?

As you probably know, childproofing your home is an important part of keeping your little ones safe. But did you know that you can also childproof your thermostat? That’s right – there are actually ways to lock your old thermostat so that your kids can’t mess with it and cause the temperature in your home to fluctuate.

So, how do you child lock a thermostat? Well, there are a few different methods that you can use. One popular method is to simply remove the batteries from the thermostat. This will prevent the thermostat from being able to turn on or off, which will in turn keep the temperature in your home consistent.

How do I stop my child from changing the thermostat?

If you’re like most parents, you’ve probably had the experience of coming home to find that your child has changed the thermostat. Maybe they turned it up because they were too hot, or turned it down because they wanted to save energy. Either way, it can be frustrating to arrive home to an uncomfortable house.

There are a few things you can do to stop your child from changing the thermostat:

  • Talk to them about why it’s important to keep the temperature consistent. Explain that turning the thermostat up and down can use a lot of energy and increase your utility bills.
  • Show them how to use the thermostat properly. If they understand how it works, they’ll be less likely to play with it.
  • Find a compromise temperature that everyone can agree on and set the thermostat accordingly. This way, no one will have to make any adjustments.
  • If all else fails, consider getting a lock for the thermostat so that only adults can make changes.

How do I stop people from touching my thermostat?

It can be frustrating when people touch your thermostat without permission, especially if you like to keep the temperature at a specific setting. Luckily, there are a few ways to prevent others from making changes to your thermostat.

One option is to buy a thermostat cover. This is a simple device that fits over your thermostat and blocks access to the buttons. You can find these covers online or at many hardware stores.

Another way to keep people from touching your thermostat is to lock it. Most modern thermostats have a lock feature that allows you to set a passcode. 

Once the passcode is entered, the thermostat cannot be changed without it. If you don’t have a lock feature on your thermostat, you can use a zip tie or piece of tape to physically block the buttons.

You can try asking nicely! Let people know that you prefer the temperature to stay where it’s at and ask them not to make any changes. In most cases, people will respect your wishes and leave the thermostat alone.

Is it rude to touch someone else’s thermostat?

It’s a question that plagues many office workers: Is it rude to touch someone else’s thermostat? The answer, unfortunately, is not a clear-cut one.

There are a few things to consider when answering this question. 

First, what is the temperature in the office? If it’s uncomfortably hot or cold, then adjusting the thermostat may be warranted. 

Second, how many people work in the office? If there are only a few people, then it might be best to just ask everyone what their preferred temperature is.

However, if the office is large and contains a variety of personalities, then touching someone else’s thermostat without permission could most certainly be construed as rude. In this case, it would be best to leave the temperature where it is and simply dress appropriately for the season.


Keeping your home comfortable should be easy when you understand how to lock your old thermostat. You can save energy by setting the temperature and then locking it in place so that no one else can inadvertently adjust it or turn up the heat unnecessarily. By following these steps, you will be able to keep your home a comfortable environment for everyone who lives there!

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