---
product_id: 1611847
title: "CG512A1009 Large Thermostat Guard, Fits Thermostats 8. 25\" W x 5. 75\" H or Smaller"
brand: "honeywell home"
price: "533 kr"
currency: DKK
in_stock: true
reviews_count: 13
category: "Honeywell Home"
url: https://www.desertcart.dk/products/1611847-cg512a1009-large-thermostat-guard-fits-thermostats-8-25-w-x
store_origin: DK
region: Denmark
---

# UV & chemical resistant clear cover Secure key lock system Tamper-proof inner shelf CG512A1009 Large Thermostat Guard, Fits Thermostats 8. 25" W x 5. 75" H or Smaller

**Brand:** honeywell home
**Price:** 533 kr
**Availability:** ✅ In Stock

## Summary

> 🔐 Lock in comfort, unlock peace of mind.

## Quick Answers

- **What is this?** CG512A1009 Large Thermostat Guard, Fits Thermostats 8. 25" W x 5. 75" H or Smaller by honeywell home
- **How much does it cost?** 533 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/1611847-cg512a1009-large-thermostat-guard-fits-thermostats-8-25-w-x)

## Best For

- honeywell home enthusiasts

## Why This Product

- Trusted honeywell home brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Peace of Mind, Elevated:** Keep family or office disputes at bay by securing your heating and cooling preferences with confidence.
- • **Crystal Clear Protection:** Ultra-clear acrylic cover resists yellowing from UV light and chemicals, maintaining sleek visibility year-round.
- • **Unbreakable Climate Control:** Lock down your thermostat settings with a heavy-duty key lock to prevent unauthorized changes.
- • **Universal Fit, Effortless Install:** Fits all Honeywell and most thermostats up to 8.25" W x 5.75" H, with quick wall-mount setup.
- • **Built to Last, Designed to Impress:** Durable multi-material construction ensures long-term protection without compromising style.

## Overview

The Honeywell CG512A1009 Large Thermostat Guard is a robust, lockable acrylic cover designed to fit Honeywell and most other thermostats up to 8.25" W x 5.75" H. Featuring a tamper-proof inner shelf and a key lock system, it prevents unauthorized adjustments to your heating and cooling settings. Its ultra-clear, UV and chemical-resistant cover ensures lasting clarity and protection, making it ideal for both residential and commercial environments. Easy to install and backed by a 1-year warranty, this guard offers a stylish yet secure solution to thermostat control.

## Description

Product Description The Honeywell Home 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 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. 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.Fits the Honeywell thermostats below and other models measuring 8.25"w x 5.75"l x 2.75"d or smaller:• RTH8xxxx Family • RTH7xxxx Family • RTH6xxxx Family* • RTH5xxxx Family* • RTH4xxxx Family • RTH3xxxx Family • CT5x Family • CT3x Family Must mount off center in order to allow room to open battery door on Honeywell models

Review: 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.
Review: Easy to install - Keep people from changing the thermostat in my home. It was easy to install and comes with two keys

## Features

- Fits all Honeywell and most other thermostats
- Clear plastic cover that resists yellowing; The Honeywell CG512A1009 Large Thermostat Guard provides the ideal defense in preventing others from tampering with your heating and cooling options.
- 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0002YSV78 |
| Backlight | No |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #38,525 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #30 in Home Thermostat Accessories |
| Brand | Honeywell Home |
| Color | Clear |
| Control Method | Touch |
| Controller Type | Hand Control |
| Customer Reviews | 4.5 4.5 out of 5 stars (3,444) |
| Date First Available | January 8, 2007 |
| Display Type | digital |
| Global Trade Identification Number | 00085267990011 |
| Included Components | Key, Large Thermostat Guard, Mounting Hardware |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 1.25 pounds |
| Item model number | CG512A1009 |
| Manufacturer | Honeywell Home |
| Material | Multi |
| Model Name | Honeywell CG512A1009 Large Thermostat Guard with Inner Shelf to Prevent Tampering |
| Mounting Type | Wall Mount |
| Part Number | CG512A1009/C |
| Power Source | Manual Winding |
| Product Dimensions | 3.25"D x 9.75"W x 7.25"H |
| Screen Size | 5 Inches |
| Shape | Rectangular |
| Size | Large |
| Special Feature | Lockable |
| Special Features | Lockable |
| Specific Uses For Product | Air Conditioner, Electric Baseboard Heater, Furnace, Heat Pump |
| Temperature Control Type | Heating and Cooling |
| UPC | 085267990011 |
| Warranty Description | 1 year product warranty. |

## Product Details

- **Brand:** Honeywell Home
- **Controller Type:** Hand Control
- **Model Name:** Honeywell CG512A1009 Large Thermostat Guard with Inner Shelf to Prevent Tampering
- **Product Dimensions:** 3.25"D x 9.75"W x 7.25"H
- **Special Feature:** Lockable

## Images

![CG512A1009 Large Thermostat Guard, Fits Thermostats 8. 25" W x 5. 75" H or Smaller - Image 1](https://m.media-amazon.com/images/I/41zZHVzmZbL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: interior  Length and height and width ??**
A: The interior is 8" wide by 5 1/2" high.

**Q: I am looking for a lockbox for the Honeywell Thermostat RTH6580WF1001/W.  The dimensions listed dont make sense.  Which will fit this Thermostat?**
A: I don't think it will fit. It's approximately 3.5 inches protruding from the wall and 9 inches length and 7 inches height.

**Q: my thermostat is almost  7 inches wide  and almost 5 inches in debt  will it fit**
A: Do you mean 5" deep or 5" tall?   If your thermostat is 5" deep then I don't believe that this will work for you.

**Q: I'm going to put this over a 2 light switch location. Will this fit?**
A: it depends on the size of the switches.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works great to keep family from fighting over thermostat
*by A***E on October 12, 2025*

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.

### ⭐⭐⭐⭐⭐ Easy to install
*by R***Y on September 16, 2025*

Keep people from changing the thermostat in my home. It was easy to install and comes with two keys

### ⭐⭐⭐⭐⭐ Perfect
*by A***R on August 2, 2025*

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.

## Frequently Bought Together

- Honeywell Home CG512A1009 Large Thermostat Guard, Fits Thermostats 8. 25" W x 5. 75" H or Smaller Clear
- Genuine Honeywell Home CG511A1000 Medium Thermostat Guard, Fits Thermostats 5" H x 6" W or Smaller
- Gedreew Large Thermostat Lock Box Cover with Key, Clear Thermostat Cover with Lock Compatible With Honeywell Home Thermostat On Wall, AC Lock Box Cover with Key Fits Thermostats 5"H x 6" W or Smaller

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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-03-06*