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Honeywell Home CG512A1009 Large Thermostat Guard, Fits Thermostats 8. 25" W x 5. 75" H or Smaller Clear

21.42

Save 11%

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Honeywell Home CG512A1009 Large Thermostat Guard, Fits Thermostats 8. 25" W x 5. 75" H or Smaller Clear

4.4

500+ bought in past month

Highest ranking 101

13 comments

$21.42

Save 11%

Other platform prices

· Protect again tampering, damage and unauthorized adjustment of thermostat settings. · Key lock with inner shelf to prevent tampering. You can mount this thermostat guard horizontally or vertically to fit your thermostat. · Clear plastic casing is chemical and UV resistant that resists yellowing. · Fits Honeywell Home thermostats measuring 8. 25"W x 5. 75"H x 2. 75"D or smaller · May need to mount thermostat off-center within thermostat guard for access to battery door on select models

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Reviews From
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MelReviewed in the United States on May 23, 2025

When your kids won’t leave your heat or air-conditioning alone, lock them suckers out!!! 😂

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CassieReviewed in the United States on September 5, 2024

This was prefect and easy to install! We have a really large (Emmerson) thermostat, and I had bought a couple other "universal large" covers but they where too small. My Mother has Alzheimer's and turns up the heat at 3 am(we live in the desert) to 95'. So this is a great safety measure.

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RobertReviewed in the United States on August 16, 2024

hAVE A RENTAL HOME WITH POOL AND SPA. GUESTS KEPT TURNING UP THE TEMP ON THE POOL AND SPA AND REALLY BIG ELECTRIC BILLS. WITH THE COVER, I HAVE CONTROL AND IT SO UNNOTICEABLE.

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AaronReviewed in the United States on July 6, 2023

I installed Honeywell Thermostats at my church so I got this cause it should fit right? Well it does just a decent size bigger all around just fyi. Only issue I had was it comes in a plastic surrounded case with cardboard back like a kids toy would (best description I got, lol). Only reason I say is that casing gave the plastic guard decent scratches on the front before it was cut out of the package. Its a slight annoyance cause you read the thermostat through it and it all will most likely be scratched already cause of the packaging.

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Meghan ParkerReviewed in the United States on September 13, 2023

This cover fits the large Lennox S40 thermostat nicely. We have two special needs children and this cover should protect it from being destroyed. It feels sturdy and well constructed. I recommend. Update…after a months use, it turns out that the cover interferes with the thermostat’s readings. With the case over the thermostat, it will not function properly and the AC continually will run. The thermostat cover prevents the thermostat from reading the inside temp properly causing the AC to run nonstop. Back to looking for a protective case that does not interfere with the thermostat’s proper functioning.

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Miss DashReviewed in the United States on October 4, 2016

I purchased this to use at my jobsite. Not to protect a thermostat, but to protect the sensor box that controls our double automatic sliding glass entry door. Even though it's about 8 feet off the ground, someone jumped up, took a tool and hit the bottom where the key mechanism is, which broke the acrylic, allowing anyone tall enough or standing on something the ability to stick their fingers in where the chunk of acrylic was broken out, enabling them to maneuver the settings. With the switch in the wrong position, my apartment building residents were put at risk because some smart-aleck would occasionally place the switch in a position allowing the door to open just by sensing someone approaching it, like at a grocery store or other businesses with sliding doors. You don't want that at an apartment building which requires the residents to let their visitors in after their presence is announced at the call box. The previous guard was the medium sized and was installed with the key in the down position as in the product description photo. I had the new one installed key on top instead. I believe that makes this stronger and less resistant to a hit. So far it has worked out very well and is very sturdy.

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ShellyReviewed in the United States on October 23, 2024

Too big

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Palwinder s.Reviewed in the United States on October 21, 2024

I like it

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MenyReviewed in Germany on January 30, 2025

good

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Helen ChiassonReviewed in Canada on April 29, 2023

It fits perfectly! It’s in a rooming house where tenants were constantly changing the heat settings: it’s a godsend!!!

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Gary From AustraliaReviewed in Australia on October 9, 2022

Used for a Sauna Controller so Patrons could see temperature of sauna but could not fiddle. Great that I could mount the cover with out having to first disconnect and remove the controller that I was trying to protect.

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Amazon CustomerReviewed in the United Kingdom on January 14, 2025

Good product

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Chris Van de VenReviewed in Belgium on April 14, 2024

De thermostaat werd "misbruikt" door veel te hoge temperaturen te vragen. De beschermkap moet dat voortaan verhinderen. Het is de enige thermostaatbeschermer die groot genoeg is voor de aanwezige thermostaat.