






🔐 Lock in comfort, lock out chaos!
The Honeywell Home CG512A1009 Large Thermostat Guard is a lockable, ultra-clear acrylic cover designed to protect large thermostats (up to 8.25" W x 5.75" H) from tampering. Its chemical and UV-resistant construction ensures long-lasting clarity and durability, while the included key lock and inner shelf prevent unauthorized access. Easy to install and compatible with most Honeywell models, it offers a practical solution to maintain consistent heating and cooling settings in both residential and commercial spaces.



| ASIN | B0002YSV78 |
| Additional Features | Lockable |
| Backlight | No |
| Best Sellers Rank | #22,034 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #22 in Home Thermostat Accessories |
| Brand | Honeywell Home |
| Brand Name | Honeywell Home |
| Color | Clear |
| Control Method | Touch |
| Controller Type | Hand Control |
| Customer Reviews | 4.4 out of 5 stars 3,442 Reviews |
| Display Type | digital |
| Global Trade Identification Number | 00085267990011 |
| Included Components | Key, Large Thermostat Guard, Mounting Hardware |
| Item Dimensions D x W x H | 3.25"D x 9.75"W x 7.25"H |
| Item Type Name | Thermostat Guard |
| Item Weight | 1.25 Pounds |
| Manufacturer | Honeywell Home |
| Manufacturer Warranty Description | 1 year product warranty. |
| Material Type | Multi |
| Model Name | Honeywell CG512A1009 Large Thermostat Guard with Inner Shelf to Prevent Tampering |
| Model Number | CG512A1009 |
| Mounting Type | Wall Mount |
| Power Source | Manual Winding |
| Product Dimensions | 3.25"D x 9.75"W x 7.25"H |
| Screen Size | 5 Inches |
| Shape | Rectangular |
| Special Feature | Lockable |
| Specific Uses For Product | Air Conditioner, Electric Baseboard Heater, Furnace, Heat Pump |
| Temperature Control Type | Heating and Cooling |
| UPC | 085267990011 |
| Unit Count | 1.0 Count |
A**E
Works great to keep family from fighting over thermostat
It looks big on the wall but it fits the thermostat perfectly. Just what we needed to keep people from fighting over control of the thermostat. Definitely worth it if family can't agree on temperature for the house.
R**Y
Easy to install
Keep people from changing the thermostat in my home. It was easy to install and comes with two keys
A**R
Perfect
Nice and big and it should get the job done! I'm so sick of coming home to find the A/C turned off because the 70 year old man is cold in 80 degrees.
R**P
Take note of the inner dimensions
Nice, high quality case, but take note of the inner dimensions, specified in the description.
C**E
Super Big!
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.
L**I
It works good if you want to cover your thermostat
It’s perfect when you’re having rooms for rent and you don’t want people messing with the thermostat
S**.
Perfect item.
No longer fighting with the family on the settings.
J**E
Very cheap made
Was very easy to install. It would also be very easy to get into without the key. Yet using the key is a nightmare. The key fit is terrible. Would not purchase again.
Trustpilot
2 weeks ago
2 months ago