---
product_id: 76497069
title: "Honeywell Home CG512A1009 Large Thermostat Guard, 8.59 x 24.77 x 18.42 cm"
brand: "honeywell home"
price: "377.27 DT"
currency: TND
in_stock: true
reviews_count: 13
category: "Honeywell Home"
url: https://www.desertcart.tn/products/76497069-honeywell-home-cg512a1009-large-thermostat-guard-8-59-x-24
store_origin: TN
region: Tunisia
---

# Fits thermostats up to 8.25"W x 5.75"H x 2.75"D Tamper-proof key lock Chemical & UV resistant casing Honeywell Home CG512A1009 Large Thermostat Guard, 8.59 x 24.77 x 18.42 cm

**Brand:** honeywell home
**Price:** 377.27 DT
**Availability:** ✅ In Stock

## Summary

> 🔐 Lock in comfort, lock out chaos!

## Quick Answers

- **What is this?** Honeywell Home CG512A1009 Large Thermostat Guard, 8.59 x 24.77 x 18.42 cm by honeywell home
- **How much does it cost?** 377.27 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/76497069-honeywell-home-cg512a1009-large-thermostat-guard-8-59-x-24)

## 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

- • **Flexible Installation:** Mount horizontally or vertically to perfectly suit your thermostat setup and space.
- • **All-Weather Durability:** Clear, chemical and UV-resistant casing ensures year-round protection without yellowing or wear.
- • **Peace of Mind Warranty:** Backed by Honeywell’s 1-year warranty for trusted, long-lasting security.
- • **Universal Compatibility:** Designed to fit Honeywell Home large thermostats and other models within precise size limits.
- • **Secure Your Climate Control:** Robust key lock with inner shelf prevents unauthorized thermostat adjustments and damage.

## Overview

The Honeywell Home CG512A1009 Large Thermostat Guard is a sleek, durable protective enclosure designed to prevent tampering and unauthorized adjustments on large thermostats. Featuring a secure key lock with an inner shelf, it fits Honeywell Home models and others up to 8.25"W x 5.75"H x 2.75"D. Its chemical and UV-resistant clear casing ensures long-lasting clarity and protection, while flexible mounting options and a 1-year warranty make it a reliable choice for safeguarding your HVAC controls.

## 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.

Review: Quality product but beware: internal dimensions are not given in the description - This is a quality product but beware: the internal dimensions are not specified and are necessarily smaller than the external dimensions given in the description. For my use: protecting a Hive thermostat and a Hive controller, the 'guard' just fit my two devices with barely a centimeter to spare in the vertical dimension. Had the separation between the two devices been greater, the 'guard' would have been useless. I got lucky. In shipping and handling, the film packaging rubs against the front cover, whitening the clear plastic a little. This can be seen in the photo against the black background of the lower right of the thermostat.
Review: good - Good product

## Features

- 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 listed as well as other models measuring 8. 25"W x 5. 75"H x 2. 75"D or smaller
- Fits Honeywell Home models: RTH8XXX, RTH7XXX, RTH6XXX, RTH5XXX, RTH4XXX, RTH3XXX, CT5X, CT3X

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0002YSV78 |
| Backlight | No |
| Best Sellers Rank | 181,613 in DIY & Tools ( See Top 100 in DIY & Tools ) 82 in Thermostat Accessories |
| Brand | Honeywell Home |
| Brand Name | Honeywell Home |
| Colour | Colorless |
| Control Method | Remote |
| Control Type | Button Control |
| Controller Type | Push Button |
| Controller type | Push Button |
| Customer Reviews | 4.4 out of 5 stars 2,907 Reviews |
| Display Type | digital |
| Finish Type | Possibly bright |
| Global Trade Identification Number | 00085267990011 |
| Included Components | Inner tray, key lock |
| Item Dimensions D x W x H | 24.8D x 18.4W x 8.6H centimetres |
| Item Shape | Rectangular |
| Item Type Name | Honeywell CG512A1009 Large Thermostat Guard with Inner Shelf to Prevent Tampering |
| Item Weight | 1.25 Pounds |
| Manufacturer | Honeywell Home |
| Manufacturer Part Number | CG512A1009/C |
| 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 |
| Model name | Honeywell CG512A1009 Large Thermostat Guard with Inner Shelf to Prevent Tampering |
| Mounting Type | Wall Mount |
| Number of Items | 1 |
| Power Source | Battery Powered |
| Product Style | Compact |
| Product dimensions | 24.8D x 18.4W x 8.6H centimetres |
| Screen Size | 5 Inches |
| Special Features | Lock with inner compartment |
| Special feature | Lock with inner compartment |
| Specific Uses For Product | Heating, ventilation, and air conditioning |
| Specification Met | UL |
| Temperature Control Type | Digital |
| UPC | 085267990011 |
| Unit Count | 1.0 count |

## Product Details

- **Brand:** Honeywell Home
- **Colour:** Colorless
- **Controller type:** Push Button
- **Included components:** Inner tray, key lock
- **Model name:** Honeywell CG512A1009 Large Thermostat Guard with Inner Shelf to Prevent Tampering
- **Power source:** Battery Powered
- **Product dimensions:** 24.8D x 18.4W x 8.6H centimetres
- **Special feature:** Lock with inner compartment
- **Specific uses for product:** Heating, ventilation, and air conditioning
- **Temperature Control Type:** Digital

## Images

![Honeywell Home CG512A1009 Large Thermostat Guard, 8.59 x 24.77 x 18.42 cm - Image 1](https://m.media-amazon.com/images/I/41zZHVzmZbL.jpg)
![Honeywell Home CG512A1009 Large Thermostat Guard, 8.59 x 24.77 x 18.42 cm - Image 2](https://m.media-amazon.com/images/I/81-qWu9jegL.jpg)
![Honeywell Home CG512A1009 Large Thermostat Guard, 8.59 x 24.77 x 18.42 cm - Image 3](https://m.media-amazon.com/images/I/517x-0Y38OL.jpg)
![Honeywell Home CG512A1009 Large Thermostat Guard, 8.59 x 24.77 x 18.42 cm - Image 4](https://m.media-amazon.com/images/I/61VBnrPfHNL.jpg)
![Honeywell Home CG512A1009 Large Thermostat Guard, 8.59 x 24.77 x 18.42 cm - Image 5](https://m.media-amazon.com/images/I/61pGkxBiXmL.jpg)

## Questions & Answers

**Q: Can people open lock without keys?? How secure is it?**
A: You need the keys to open it. 
I guess you could ram a screwdriver into the lock or break the case to get in, but then it would obvious.

**Q: How many keys come with this?**
A: Two Keys are supplied but I had some more cut locally.

**Q: CG512A1009 will this fit the hive control panel temperature control thermostat**
A: Yes

**Q: Does the cover allow sufficient air circulation to allow thermostat to sense correct temperature?**
A: You need to set the thermostat a couple of degrees lower as it takes time for the hot air to get into the box, by that time you are melting!

## Customer Reviews

### ⭐⭐⭐⭐⭐ Quality product but beware: internal dimensions are not given in the description
*by A***R on 5 April 2021*

This is a quality product but beware: the internal dimensions are not specified and are necessarily smaller than the external dimensions given in the description. For my use: protecting a Hive thermostat and a Hive controller, the 'guard' just fit my two devices with barely a centimeter to spare in the vertical dimension. Had the separation between the two devices been greater, the 'guard' would have been useless. I got lucky. In shipping and handling, the film packaging rubs against the front cover, whitening the clear plastic a little. This can be seen in the photo against the black background of the lower right of the thermostat.

### ⭐⭐⭐⭐⭐ good
*by A***R on 14 January 2025*

Good product

### ⭐⭐⭐⭐⭐ Does job
*by A***R on 26 June 2023*

Good quality does the job

## 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 Tunisia*
*Store origin: TN*
*Last updated: 2026-09-27*