---
product_id: 76497069
title: "CG512A1009 Large Thermostat Guard, 8.59 x 24.77 x 18.42 cm"
brand: "honeywell home"
price: "57851CFA"
currency: XOF
in_stock: true
reviews_count: 13
category: "Honeywell Home"
url: https://www.desertcart.sn/products/76497069-cg512a1009-large-thermostat-guard-8-59-x-24-77-x
store_origin: SN
region: Senegal
---

# Fits thermostats up to 8.25"W x 5.75"H x 2.75"D Secure key lock UV & chemical resistant casing CG512A1009 Large Thermostat Guard, 8.59 x 24.77 x 18.42 cm

**Brand:** honeywell home
**Price:** 57851CFA
**Availability:** ✅ In Stock

## Summary

> 🔐 Lock in control, unlock peace of mind.

## Quick Answers

- **What is this?** CG512A1009 Large Thermostat Guard, 8.59 x 24.77 x 18.42 cm by honeywell home
- **How much does it cost?** 57851CFA with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/76497069-cg512a1009-large-thermostat-guard-8-59-x-24-77-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

- • **Flexible Installation:** Mount horizontally or vertically to perfectly suit your thermostat’s placement and style.
- • **Tamper-Proof Security:** Keep your thermostat settings locked down with a sturdy key lock and inner shelf to prevent unauthorized access.
- • **All-Weather Durability:** Clear, chemical and UV-resistant casing ensures year-round protection without yellowing or damage.
- • **Universal Compatibility:** Designed to fit Honeywell Home large thermostats and other models within precise dimensions for versatile use.
- • **Effortless Peace of Mind:** Easy to install and maintain, this guard safeguards your HVAC controls so you can focus on what matters.

## Overview

The Honeywell Home CG512A1009 Large Thermostat Guard is a robust, UV and chemical-resistant protective casing with a secure key lock and inner shelf, designed to prevent tampering and unauthorized adjustments on large Honeywell and compatible thermostats up to 8.25"W x 5.75"H x 2.75"D. Its flexible mounting options and durable materials make it an essential safeguard for professional and home HVAC setups.

## 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: good - Good product
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.

## 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 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 67,260 in DIY & Tools ( See Top 100 in DIY & Tools ) 30 in Thermostat Accessories |
| Colour | Colorless |
| Customer Reviews | 4.4 4.4 out of 5 stars (2,882) |
| Date First Available | 7 Aug. 2012 |
| Display style | digital |
| Finish | Possibly bright |
| Included components | Inner tray, key lock |
| Item Package Quantity | 1 |
| Item Weight | 567 g |
| Item model number | CG512A1009 |
| Manufacturer | Honeywell Home |
| Material | Multi |
| Part number | CG512A1009/C |
| Plug profile | Wall Mount |
| Power source type | Battery Powered |
| Product Dimensions | 8.59 x 24.77 x 18.42 cm; 566.99 g |
| Shape | Rectangular |
| Size | L |
| Special Features | Lock with inner compartment |
| Specific uses | Heating, ventilation, and air conditioning |
| Specification met | UL |
| Style | Compact |

## 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

![CG512A1009 Large Thermostat Guard, 8.59 x 24.77 x 18.42 cm - Image 1](https://m.media-amazon.com/images/I/41zZHVzmZbL.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

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

Good product

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ 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

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.sn/products/76497069-cg512a1009-large-thermostat-guard-8-59-x-24-77-x](https://www.desertcart.sn/products/76497069-cg512a1009-large-thermostat-guard-8-59-x-24-77-x)

---

*Product available on Desertcart Senegal*
*Store origin: SN*
*Last updated: 2026-01-31*