Internet #314279315

Model #CG511A1000/6PK

Thermostat Lockbox Cover (6-Pack)

Frequently Bought Together


Product Overview

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
  • Click here to shop all Honeywell Home thermostats

Info & Guides

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Product Depth (in.)
3 in
Product Height (in.)
11 in
Product Width (in.)
9.5 in


Accessory Type
Thermostat Cover
Color Family
Tamper Resistant

Warranty / Certifications

Manufacturer Warranty
1 year limited warranty

Questions & Answers


What size is this medium or Large

Asked by Robin January 28, 2021

It’s large. Good for standard rectangular digital thermostat.

What are the inside dimensions of these 6-pack lockboxes????

Asked by NT January 19, 2021

Are all the keys interchangeable?

Asked by Dodo January 13, 2021

Will this fit TH5320U/TH5220D

Asked by Cotton November 30, 2020

Its so easy to install and it only took me 15 minutes with the right tools on hand.

What are the dimensions for the thermostat guard? I have a Honeywell thermostat that is 3.5 inch...

Asked by Brady August 7, 2020

I brought this last week installed in less than 10 minutes . Help unwanted people touching your thermostat!

what are the dimensions

Asked by steve June 10, 2020

Depth 3" Lengh11" Width 9.5"

what are the dimentions?

Asked by mike October 29, 2019

fits max 6 x 5 inch thermostat overall 7.5 x 6.5 inches

can I buy 20 boxes and have them keyed the same

Asked by jay October 8, 2019

They are all keyed the same. The lock is for deterrence, not security.

Does it slide over the thermostat or do you have to remove it first?

Asked by manager August 14, 2019

It mounts OVER the thermostat. No need to remove t-stat to install it !!

what are the inside dims ?

Asked by chris June 11, 2019

6” wide x 5” tall x 4” deep.

Thermostat Lockbox Cover (6-Pack) - page 2

Customer Reviews

  • 4.4
    out of 306 reviews
  • 89% recommend this product
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Showing 1-10 of 306 reviews
Does NOT Fit ALL Honeywell Thermostats!
Do NOT believe what is written on the package, "Fits all honeywell thermostats and most others." This is simply not true. I have the RTH8500D 7-Day Touchscreen and this guard is too small to go around it.
by Jeffrey
1 person found this helpful
Since this product was exactly as described it was easy for me to adapt it to where I needed to i...
Since this product was exactly as described it was easy for me to adapt it to where I needed to install it. And since you had plenty in stock, I was able to pick up and install it the same day. Thanks to Home Depot.
by Loopin
1 person found this helpful
Very good product.
Very good product.
by MeOff
used for baby proofing, works great.
Our son is obsessed with the AC power adapter for our security system, which would be difficult to move. install took about 5 minutes, half of which was walking back and fourth for tools. The cover is very sturdy, and I don't think the kiddo will be messing with the power adapter any time soon. I also have a small night light within the cover. when I do remove it, I will only have to patch 4 holes from where the drywall anchors are installed.
by MaxJ
1 person found this helpful
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!
by desertroze
18 people found this helpful
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.
by damorg5623
83 people found this helpful
by HomeDepotCustomer
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
by HomeDepotCustomer
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
by HomeDepotCustomer
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
by HomeDepotCustomer
Showing 1-10 of 306 reviews