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  • Honeywell CG512A1009 Large Thermostat Guard with  Inner Shelf to Prevent Tampering
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Honeywell CG512A1009 Large Thermostat Guard with Inner Shelf to Prevent Tampering

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List Price: $19.99
Price: $16.29 & FREE Shipping on orders over $35. Details
You Save: $3.70 (19%)
In Stock.
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  • Fits all Honeywell and most other thermostats
  • Clear plastic cover that resists yellowing
  • Key lock with inner shelf to prevent tampering
  • Protects unwanted changes to AC/Heating preferred settings
  • Ultra clear acrylic resin cover and base resists the yellowing effects of chemicals and UV-light
38 new from $12.71 6 used from $11.00

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Frequently Bought Together

Honeywell CG512A1009 Large Thermostat Guard with  Inner Shelf to Prevent Tampering + Honeywell CG511A1000 Medium Thermostat Guard with Inner Shelf to Prevent Tampering + Honeywell CG510A Thermostat Guard, Small
Price for all three: $49.17

Buy the selected items together

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Package Quantity: 1
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Product Details

Package Quantity: 1
  • Product Dimensions: 3.4 x 9.8 x 7.2 inches
  • Shipping Weight: 1.3 pounds (View shipping rates and policies)
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • ASIN: B0002YSV78
  • Item model number: CG512A1009
  • Average Customer Review: 4.0 out of 5 stars  See all reviews (61 customer reviews)
  • Amazon Best Sellers Rank: #11,401 in Home Improvement (See Top 100 in Home Improvement)

Product Description

Package Quantity: 1

Product Description

Ultra clear chemical and UV resistant acrylic resin cover and base resist yellowing. Secure, tumbler type key lock; key removable only in locked position. Double wall barrier in ring base blocks thermostat tampering tools, yet allows air circulation. Ring base mounts directly over existing thermostat; no removal required. Meets or exceeds UL pry test and impact test standards. All covers are keyed alike.

From the Manufacturer

The CG512A Large Sized Thermostat Guard protects thermostats from tampering in commercial and residential environments. Includes universal key and heavy duty lock.

Customer Reviews

Good quality and ships quickly.
Chris Shannon
What was the most frustrating though were that the packaging kept saying"easy to install" but for me it wasn't and I couldn't find any step by step directions.
charlise lyons
The main problem, as many have noted, is that the dimensions are much smaller than the listing indicates.
SarahLawrence Scott

Most Helpful Customer Reviews

22 of 23 people found the following review helpful By S. Gable on October 23, 2008
Item Package Quantity: 1
I bought this to keep people from turning the heat up. I thought it was working well until I noticed it was getting warmer! I checked the thermostat and to my suprise it was turned UP!! I asked around and found out that someone had simply "popped off" the lid! The lid is NOT fastened to the back part of the box! It comes apart in two pieces and the person popped off the cover at the top where it's not fastened together! I am not happy at all! I did not buy this from amazon but wanted to warn everyone! I paid $19 for this piece of junk and am taking it back to the store where I bought it! My advice is to look for one that is one whole piece-- so the lid does not come off from the back!

IT'S A PIECE OF JUNK... unless you're using it to guard against children since they're not strong enough to pop off the top!
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9 of 9 people found the following review helpful By P on August 28, 2012
Item Package Quantity: 1 Verified Purchase
The item is advertised to be much bigger than it is. Here are the REAL dimensions (OD), which as it turned out were too small for my need, thank you very much: 9.75"L x 7.25"W x 3.25"D.

What a royal waste of my time. Hopefully it won't be of yours also.
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6 of 6 people found the following review helpful By Lynette Mendoza Villa on March 3, 2006
Item Package Quantity: 1
This cover is constructed very well and definitely serves its purpose. So far, no problems with it. Looks nice and keeps people from tampering with the thermostat. I would recommend.
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3 of 3 people found the following review helpful By J. Jack on June 5, 2012
Item Package Quantity: 1 Verified Purchase
I bought several of these for work (too many people thinking the temperature needed adjusting). They were easily installed and covered the 5 different types of thermostats more than adequately. I'd read a review that said the locks are shoddy, but did not find this true with my purchase. The way they are made prevents paperclips or nail files from being used to circumvent the cover. Exactly what was needed!
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3 of 3 people found the following review helpful By R. Rice on October 25, 2011
Item Package Quantity: 1 Verified Purchase
The product description on Amazon clearly says that this thermostat guard is 12 inches by 11 inches.

The guard I received is much smaller - 9.75 inches by 7.25 inches.

It appears to be the correct product, as it has Honeywell part number CG512A on the package.

Too small for what I need, so it is going back.

The product description needs to be corrected.
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3 of 3 people found the following review helpful By E. Steele on January 9, 2007
Item Package Quantity: 1
The Thermostat-Guard is exactly what i needed to keep people from reaching up & adjusting the air temp during our classes.
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2 of 2 people found the following review helpful By Cellaich on June 30, 2013
Item Package Quantity: 1
These things suck! One of my tenants told me today how he unlocked the unit with a paper-clip and if that hadn't done the job he was just going to borough a friends key since the keys are all the same!!! I installed 4. = $80 bucks down the drain. (Tenants DO talk.) Good for nothing. It would work much better if there were some type of latch so I could put on a small pad-lock. I knew the keys worked on all the units-I was hoping the tenants didn't know. Also, slanting/sloping the top of the unit would discourage the old "frozen peas on the top of the thermostat cover" to kick the heat up trick.
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2 of 2 people found the following review helpful By Zigtar on February 5, 2011
Item Package Quantity: 1 Verified Purchase
This product works as described, however if you apply a small amount of force you can open the case from the top without the key. For most people just having the case over the thermostat will serve as a deterrent but for the more determined something more secure will be needed.

Worked perfectly for my needs and I would buy it again.
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