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Large Thermostat Guard CG512A:

Fits the following Honeywell Thermostats below and other models measuring 8.25" W x 5.75" H x 2.75" D or smaller:

  • RTH8xxxx Family Thermostats
  • RTH7xxxx Family Thermostats
  • RTH6xxxx Family Thermostats
  • RTH5xxxx Family Thermostats
  • RTH4xxxx Family Thermostats
  • RTH3xxxx Family thermostats
  • CT5x Family thermostats
  • CT3x Family Thermostats

Large Thermostat Guard

The Honeywell CG512A1009 Large 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 Large Sized (8.25" W x 5.75" H x 2.75" D or smaller) Honeywell 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.

  • Clear plastic cover that resists yellowing.
  • Key lock with inner shelf to prevent tampering.
  • Protects unwanted changes to AC/Heating preferred settings.
Product Details
Product Specs
Product Manuals
Honeywell Home Large Thermostat Guard - CG512A Video

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CG512A1009/C customer reviews

Overall Rating

8 Reviews
8 customers recommend this product
Honeywell Home Large Thermostat Guard - CG512A Reviews
June S
February 11, 2022
Verified Purchase
Keeping Heat Low

It helps keep the kids from turning up the heat Thanks

Marisol Narvaez
June 15, 2019
Verified Purchase

Fits perfectly, very durable exactly what I needed.

Robert Hartshorn
August 24, 2016
Verified Purchase
Does the job

Installed quickly with only a couple of tools. Office staff can't mess with the thermometers any more.

Paul R
February 3, 2015
Verified Purchase
for a cafeteria

this item worked and is exactly what we needed.

Brad Remington
October 24, 2013
Verified Purchase

Very easy to order and shipment arrived in a timely manner.

Elliott Maser
May 14, 2013
Verified Purchase

Easy installation and a plus that only the person with the key can now adjust the thermostat.

Bessy Rojas
February 22, 2013
Verified Purchase
thermostat guard box

am using the box to cover a wireless router. But I need a slightly bigger box . Just a coupe of inches more height. Can you help?

Teresa Barber
November 30, 2011
Works great

I have a home day care- thank you! This keeps those curious little fingers from even trying to play with the thermostat.

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