- 10%

CG511A1000 Medium Thermostat Guard, Fits Thermostats 5″ H x 6″ W or Smaller, White

Original price was: $20.99.Current price is: $18.99.

Added to wishlistRemoved from wishlist 0
Add to compare


Price: $20.99 - $18.99
(as of Sep 29, 2025 00:34:19 UTC – Details)


The Honeywell Home CG511A Medium Thermostat Guard provides the ideal defense in preventing others from tampering with your heating and cooling options. An elevated peace of mind is established as users will no longer have to worry about any unauthorized access that may result with adjustments or damages. Installation is near effortless and the Guard will fit on all Medium Sized (6″ W x 5″ H x 1. 75″ D or smaller) Honeywell Home thermostats and a host of others. The actual casing is chemical and UV resistant which allows users to deploy their cover all year round without the slightest concern. A steadily constructed key and lock function will perform admirably as a versatile defense. Fits the following Honeywell Thermostats below and other models measuring 6 1/16″ W x 5 1/16″ H x 2 5/8″ D or smaller: RTH8xxxx Family Thermostats, RTH7xxxx Family Thermostats, RTH6xxxx Family Thermostats, RTH5xxxx Family Thermostats and CT3x Family Thermostats.
Protect against tampering, damage and unauthorized adjustment of thermostat settings.
Fits Honeywell Home thermostat families RTH8xxxx, RTH7xxxx, RTH6xxxx, RTH5xxxx, CT3x and other models measuring 6 1/16 W x 5 1/16 H x 2 5/8 D inches or smaller.
Actual size of thermostat guard: 6. 5″ H x 7. 5″ W x 3″ D.
Key lock with inner shelf to prevent tampering.
Clear plastic casing is chemical and UV resistant that resists yellowing.

Customers say

Customers find the thermostat guard effective at preventing tampering and easy to install, taking just five minutes to mount. The product fits all Honeywell thermostats perfectly and offers good value by helping control heating costs. While some customers describe it as sturdy, others report it breaks easily. The size receives mixed feedback, with some finding it great while others say it’s larger than expected.

13 reviews for CG511A1000 Medium Thermostat Guard, Fits Thermostats 5″ H x 6″ W or Smaller, White

0.0 out of 5
0
0
0
0
0
Write a review
Show all Most Helpful Highest Rating Lowest Rating
  1. Devin S.

    Definitely recommend!
    Installs and works as described. Easy to use. Purchased for our new home as our Autistic son loves numbers and likes to play with the buttons. This has SAVED us money. Thank you!

    Helpful(0) Unhelpful(0)You have already voted this
  2. tim

    Keeps people from messing with the temps
    Bought this because as a father and husband I was tired of anyone messing with the thermostat. It was easy to mount to the wall and works as intended. I did eventually give my wife a key but the temps stay where I set them now. A bonus is I see this brand everywhere like hotels and my work….my key works on other Honeywell covers, not sure if the key is the same on all of them but I find this fact LOL. Bought a 2nd just for the keys because I lost mine before as well.

    Helpful(0) Unhelpful(0)You have already voted this
  3. Jefferies

    Must have in a office
    Very well made. Protects the thermostat from being adjusted by everyone in the building.

    Helpful(0) Unhelpful(0)You have already voted this
  4. Michael Ranieri

    Clearly a Good Choice
    The guards are larger than what the picture had shown. The picture says “Medium” and indicated a more rectangular-shaped box…so I had expected something conforming closer to the shape of my medium-sized Honeywell thermostat. What was sent, and what actually matches the part number is a “Large” square-shaped thermostat guard. I think what me as the consumer was expecting was a medium-sized guard. But what Honeywell was intending was a guard that fits medium-sized thermostats…which it does….and…also fits large-sized thermostats. So, it is actually a large guard. The quality of manufacture is fine. The lock is fine. It is not meant to be a bullet-proof vault. It is only meant to keep most wandering fingers from adjusting the temp. Yes, if you wanted to, you could just pull it off the wall…but if that is your problem, then you have larger problems with your customers.The guard looks nice installed. It is not grossly too big. It was easy to install. Other reviews are correct that it is not “hinged” per se. It has tabs on the top that fit together…but when you unlock it, the cover does just fall right off. I think it’s still ok because we are only intending on changing the thermostat twice a year…once for heating mode and once for cooling mode. It is also a great price!

    Helpful(0) Unhelpful(0)You have already voted this
  5. Hanna

    Good buy
    Very good for the price range. Easy to install yourself. Fit perfectly around my thermostat. Doesn’t look tacky. Great hasn’t broken.

    Helpful(0) Unhelpful(0)You have already voted this
  6. Rood Dood

    It performs the function that I bought it for: deterrence.
    I was hesitant to buy this because of all the criticizing reviews that stated that it will not stop any adult who is determined to rip or knock it off the wall. That critique is 100% true. I could easily take a hammer, a small pot, just about any blunt object and knock this box off the wall.My father has dementia and was constantly changing the house thermostat settings.After installing this product, my family found that just its presence, and the box locked up, deters my father from changing the thermostat settings. We’ve realized that he’s not so far gone with his dementia that he will consciously perform damage to the house because his stubbornness wants the thermostat set a certain way. So, this product successfully performs its function for our family.

    Helpful(0) Unhelpful(0)You have already voted this
  7. ICF Operations

    Perfect fit
    Perfect fit

    Helpful(0) Unhelpful(0)You have already voted this
  8. Discerning buyer

    Too bulky too big
    I have a small round thermostat and had a hard time finding anything compatible. The case is very big and deep. Strange design, the top part of the case easily comes undone when unlock in a surprise manner. At first, I thought I broke the case, just to realize it was a poor not well-thought design. Imagine, you unlock the case, opened the case and the top portion of the case came from its plastic hinges as i it got broken, you than have to place the top portion back into hinges and lock the case as the top portion won’t stay open in unlock position.

    Helpful(0) Unhelpful(0)You have already voted this
  9. Lisa Marie

    Exactly as described. Easy to install. Easy to see through and the holes are designed to prevent tampering. I had another one that you could stick a paper clip through to change the temperature. This one is perfect though as the slots are misaligned to you can not get anything in and near the buttons (trust me I tried when I misplaced the key)

    Helpful(0) Unhelpful(0)You have already voted this
  10. Jamie Vincent

    Thank you

    Helpful(0) Unhelpful(0)You have already voted this
  11. C.Cole

    stops co worker from occasionally adjusting AC temp.

    Helpful(0) Unhelpful(0)You have already voted this
  12. Francisco

    Me ha gustado pues cumple su función a buen precio. Hay que tener en cuenta que no tiene bisagras. Esto para mi es bueno, porque tengo otras con bisagras y es por donde se rompen asi que me quedo con esta. Hay que tener cuidado porque al abrirlo se despega la cara frontal. También puedes tener la cara quitado para algunas ocasiones y asi no tener la puerta abierta con riesgos.

    Helpful(0) Unhelpful(0)You have already voted this
  13. karinne Jankowski

    Utilisé dans un gîte pour empêcher l’accès au thermostat de chauffage. Fonctionne très bien. Le plexi est epais et de bonne qualité.

    Helpful(0) Unhelpful(0)You have already voted this

    Add a review

    Your email address will not be published. Required fields are marked *

    CG511A1000 Medium Thermostat Guard, Fits Thermostats 5″ H x 6″ W or Smaller, White
    CG511A1000 Medium Thermostat Guard, Fits Thermostats 5″ H x 6″ W or Smaller, White

    Original price was: $20.99.Current price is: $18.99.

    Best Deals for all new
    Logo
    Compare items
    • Total (0)
    Compare
    0
    Shopping cart