Model # CG511A

Internet # 202024249

Store SKU # 572825

Thermostat Guard

$18.88 /each
  • Fits all Honeywell and most other thermostats
  • Key lock with inner shelf to prevent tampering
  • Clear plastic cover that resists yellowing



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


Price: $10 - $20
Brand: Honeywell
Review Rating: 4 & Up
Color Family: Clear


Rated 4.3 out of 5 by 42 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 Stable temp I laughed when reading reviews before I purchased this, as it seems I am not alone in frustration over thermostat control. This device installed easily. The lock works fine though not quite as smoothly as I would like. The whole thing seems a bit vulnerable to someone taking out frustration or anger at being locked out and prying if not yanking it off the wall, but that isn't usually the case in a residential setting and isn't a problem in mine. The size, a bit larger than another I considered, fit perfectly over my thermostat. I appreciated the reviewer who mentioned the size listed covers outside dimensions and that the inside dimension is slightly smaller. All in all, I would prefer not to have to use this, but it's serving the purpose well. November 3, 2015
Rated 1.0 out of 5.0 by Does not fit "All" Honeywell thermostats I bought three of this item. The package claims "Fits over all Honeywell and most other thermostats." However, it does not fit over the Honeywell programmable thermostat that is 6 and 3/8 inches wide. Two others of this item that I bought at the same time fit their thermostats okay and installation was easy. Appreciate that the same key works for the other two so I don't have to carry so many keys but am disappointed that one thermostat remains unprotected. January 17, 2016
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 5.0 out of 5.0 by excellent product Easy to install and solved the problem of too many fingers pushing buttons. September 15, 2015
Rated 5.0 out of 5.0 by Good Quality Product Honeywell always provides excellent quality products for your HVAC needs. October 29, 2015
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
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