Message to Our Customers


Model # CG511A

Internet # 202024249

Store SKU # 572825

Thermostat Guard

This item has been discontinued.
The Home Depot no longer carries this specific product.

$18.88 / each



Model # CG511A

Internet # 202024249

Store SKU # 572825

The Honeywell Thermostat Guard protects your thermostat from unwanted tampering or damage. It mounts easily to facilitate reliable monitoring of usage. The clear plastic cover has a key lock and is compatible with most Honeywell and other thermostats.

  • Key lock with inner shelf to prevent tampering
  • Fits over existing thermostat
  • Clear plastic cover resists yellowing
  • Fits Honeywell and most other thermostats


Product Depth (in.) 
Product Height (ft.) 
Product Height (in.) 
Product Width (in.) 
Color Family 
Warranty / Certifications
Manufacturer Warranty 
1 year limited warranty 


Rated 4.3 out of 5 by 36 reviewers.
Rated 5.0 out of 5.0 by Stopping "I didn't do it!" My husband and I purchased this cover and it was installed in less than 5 minutes. We absolutely love it! Our house has an invisible guest named, "I didn't do it," that is in the habit of lowering the settings on our thermostat. We now have the gremlin stopped in it's tracks. We love the features on this model because we can easily change out to upgrade the thermostat itself. Our house has the bulky 80's model thermostat currently and it will eventually need upgrading. It wasn't easy to tell based on the picture if the unit would fit over ours. I am very pleased so far! April 20, 2015
Rated 5.0 out of 5.0 by This Item is a MUST for ALL Homes! I purchased this Honeywell Thermostat Guard, to STOP other people who live in my house from changing MY Thermostat settings. Everytime I would set my thermostat where I wanted it, someone else would come along and change it. No one would admitt to it, and I got tired of paying a large gas & electric bill every month. No one else is helping me to pay my Gas & Electric bill, so they needed to keep their hands off, but they wouldn't. This Thermostat Guard LOCKS over my thermostat, and now NO ONE else can change my settings. It is made of a strong clear plastic so I can easily see what my thermostat is set at. It was very, very easy to install, I was able to do it in just five minutes. It has a really strong lock, and it comes with 2 keys. I don't know what else I can say about this item except that it does exactly what I wanted it to, and the cost was reasonable. December 4, 2012
Rated 4.0 out of 5.0 by big payoffs in the long run! We purchased 6 of these for thermostats at a 7500 sq ft business with 20 employees - as you can imagine, there were a lot of who-dunnits regarding the AC or heat being on where it wasn't supposed to be, temperatures set to hold well above or below the mandated 74 degree set point. The installation hardware included drywall anchors, but they're red and show through the clear case, and I would have preferred white anchors so they didn't look so out of place, but oh-well. I'm overall very satisfied with these and can't wait to see our utility bills in the upcoming months -- my biggest issue with these is more of a nuisance than an actual problem, but when I ordered them there was no option to have them keyed alike and I didn't consider that it wouldn't be a universal key, so now I've got 6 different keys I've got to keep track of in addition to all the other facility keys there are! June 27, 2015
Rated 4.0 out of 5.0 by Dimension Probelm The dimensions given are the outside dimensions as the inside dimensions are an inch smaller. When putting it over a thermostat this is important to know. October 4, 2011
Rated 4.0 out of 5.0 by Great alternitive use We did not use this product for a thermostat. We used it to lock up an iPod that is used to play music in our facility. Had to make a little cut in the side to allow the cords to connect. August 26, 2014
Rated 5.0 out of 5.0 by Keep others from changing the temperature! Easy to mount, fits a variety of sizes of thermostats. November 4, 2014
Rated 5.0 out of 5.0 by Fit the bill I am extremely satisfied with this purchase. It was easy to install and protects unwanted tampering with the thermostat. The air holes allow proper ventilation and works great. December 11, 2013
Rated 5.0 out of 5.0 by Stop others from changing the temp.We would get guests would raise or lower the thermostat Its a hard plastic box that goes around the thermostat so others can not change the temp March 2, 2015
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