---
product_id: 2336362
title: "Genuine Honeywell Home CG510A Thermostat Guard, Small, Fits Thermostats 4.375H x 4.375W inches or smaller"
brand: "honeywell home"
price: "฿2598"
currency: THB
in_stock: true
reviews_count: 8
category: "Honeywell Home"
url: https://www.desertcart.co.th/products/2336362-genuine-honeywell-home-cg510a-thermostat-guard-small-fits-thermostats-4
store_origin: TH
region: Thailand
---

# Fits thermostats ≤4.375" x 4.375" Built-in lock & key for secure control Easy wall-mount installation kit included Genuine Honeywell Home CG510A Thermostat Guard, Small, Fits Thermostats 4.375H x 4.375W inches or smaller

**Brand:** honeywell home
**Price:** ฿2598
**Availability:** ✅ In Stock

## Summary

> 🔐 Secure your climate, secure your peace of mind.

## Quick Answers

- **What is this?** Genuine Honeywell Home CG510A Thermostat Guard, Small, Fits Thermostats 4.375H x 4.375W inches or smaller by honeywell home
- **How much does it cost?** ฿2598 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/2336362-genuine-honeywell-home-cg510a-thermostat-guard-small-fits-thermostats-4)

## 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

- • **Hassle-Free Setup:** Comes with all mounting hardware for quick, professional-grade installation in minutes.
- • **Durable & Discreet:** Sturdy plastic construction blends seamlessly with your environment while standing up to tampering.
- • **Crystal Clear Protection:** Transparent cover keeps your thermostat visible while safeguarding settings from meddling.
- • **Tailored Fit for Honeywell:** Precisely designed to fit Honeywell Home thermostats and similar models up to 4.375" square.
- • **Lock Down Your Comfort Zone:** Prevent unauthorized thermostat tweaks with a secure, built-in lock and key system.

## Overview

The Honeywell Home CG510A Thermostat Guard is a clear, lockable cover designed to protect thermostats up to 4.375" x 4.375" from unauthorized adjustments. It includes a built-in lock with key, mounting hardware, and fits popular Honeywell models like CT87 and RTH5100B. Durable and easy to install, it ensures your HVAC settings remain consistent, ideal for professional and public spaces.

## Description

Small, clear thermostat guard prevents unwanted/unauthorized temperature on your thermostat. Includes built-in lock and key. Fits the following Honeywell thermostat models: CT87, CT3x without the wall plate and the RTH5100B (guard must be removed to access this product's battery door). May fit other thermostats of similar size. Interior dimensions: 4-7/16 W x 4-7/16 H x 2-1/4 D (inches). Outside dimensions: 5-7/8 W x 5-7/8 H x 2-1/2 D (Inch). Includes: cover, base, lock and key, and mounting hardware. 8.8 x 13 x 9.5 inches (Packaged product)

Review: Super easy to install, durable, perfect size - We have the square Johnson Controls thermostats at work for every zone. Several of these are in places where the general public has the opportunity to make adjustments. Despite our HVAC only having a 3 degree variance on either side of neutral, this does cause disturbances in the workplace. This is a great solution. It seems sturdy for the money, and works great. It installed super easy and the key, while tight, works excellently. It's sturdy enough to discourage people from trying to pry it open and would fit those standard round home thermostats too. It comes with all the parts you need and keeps people from meddling with the controls.
Review: Perfect for the thermostat - Perfect fit

## Features

- Clear plastic cover with built-in lock and a set of keys.Fits Thermostats 4.375H x 4.375W inches or Smaller
- For use with Honeywell Home thermostats. It protects against unwanted changes to AC/Heating preferred settings
- Inside dimensions: 4.44"W x 4.44"W x 2.25"D
- Outside dimensions: 5.88"W x 5.88"H 2.50"D
- Fits Thermostats 4.375H x 4.375W inches or Smaller

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B007EJA7VC |
| Additional Features | Low Voltage |
| Backlight | No |
| Best Sellers Rank | #131,711 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #125 in Home Thermostat Accessories |
| Brand | Honeywell Home |
| Brand Name | Honeywell Home |
| Color | Clear |
| Control Method | Push Button |
| Controller Type | Push Button |
| Customer Reviews | 4.3 out of 5 stars 2,399 Reviews |
| Global Trade Identification Number | 00085267776905 |
| Included Components | Thermostat guard, wall anchors, screws, key |
| Item Height | 5.88 inches |
| Item Type Name | Thermostat Guard |
| Item Weight | 9.6 ounces |
| Manufacturer | Honeywell Home |
| Manufacturer Warranty Description | 1 year limited warranty. |
| Material Type | Plastic |
| Model Name | CG510A1019/N |
| Model Number | CG510A1019/N |
| Mounting Type | Wall Mount |
| Power Source | Hardwired |
| Product Style | Traditional |
| Special Feature | Low Voltage |
| Specific Uses For Product | Furnace |
| Temperature Control Type | Heating |
| UPC | 085267776905 |
| Unit Count | 1.00 Count |

## Product Details

- **Brand:** Honeywell Home
- **Color:** Clear
- **Controller Type:** Push Button
- **Model Name:** CG510A1019/N
- **Special Feature:** Low Voltage

## Images

![Genuine Honeywell Home CG510A Thermostat Guard, Small, Fits Thermostats 4.375H x 4.375W inches or smaller - Image 1](https://m.media-amazon.com/images/I/51P2nTVAbjL.jpg)
![Genuine Honeywell Home CG510A Thermostat Guard, Small, Fits Thermostats 4.375H x 4.375W inches or smaller - Image 2](https://m.media-amazon.com/images/I/61BSHThRo+L.jpg)
![Genuine Honeywell Home CG510A Thermostat Guard, Small, Fits Thermostats 4.375H x 4.375W inches or smaller - Image 3](https://m.media-amazon.com/images/I/61QZF-B3qkL.jpg)
![Genuine Honeywell Home CG510A Thermostat Guard, Small, Fits Thermostats 4.375H x 4.375W inches or smaller - Image 4](https://m.media-amazon.com/images/I/710IEayN-0L.jpg)
![Genuine Honeywell Home CG510A Thermostat Guard, Small, Fits Thermostats 4.375H x 4.375W inches or smaller - Image 5](https://m.media-amazon.com/images/I/710OBaTIWeL.jpg)

## Available Options

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

## Questions & Answers

**Q: Can I order multiple units that all use the same key?**
A: I ordered three of these and they all have the same key.

**Q: Is cover attached to frame to prevent any one from using knife to pop off the cover from the top to get to thermastat?**
A: If someone really wanted to get the cover off they could. We have a lot of out of town guest and it keeps them from changing the temps.

**Q: What are the dimensions?  There are two listed: a) 8.8 x 13 x 9.5 inches. OR b) 5-7/8 W x 5-7/8 H x 2-1/2 D.  So which is it?**
A: 5-7/8 hx2-1/2

**Q: if my thermostat size is 5 1/2 " x 5 1/5 " x 1 1/2 will this work?**
A: No

## Customer Reviews

### ⭐⭐⭐⭐⭐ Super easy to install, durable, perfect size
*by E***N on September 5, 2013*

We have the square Johnson Controls thermostats at work for every zone. Several of these are in places where the general public has the opportunity to make adjustments. Despite our HVAC only having a 3 degree variance on either side of neutral, this does cause disturbances in the workplace. This is a great solution. It seems sturdy for the money, and works great. It installed super easy and the key, while tight, works excellently. It's sturdy enough to discourage people from trying to pry it open and would fit those standard round home thermostats too. It comes with all the parts you need and keeps people from meddling with the controls.

### ⭐⭐⭐⭐⭐ Perfect for the thermostat
*by O***S on July 12, 2025*

Perfect fit

### ⭐⭐⭐⭐⭐ Perfect fit
*by P***W on December 3, 2024*

Very easy to install with wood glue clear no screws needed no need to worry about anyone turning system up or down very secure easy to lock and unlock don’t think about it just buy it

## Frequently Bought Together

- Genuine Honeywell Home CG510A Thermostat Guard, Small, Fits Thermostats 4.375H x 4.375W inches or smaller
- Honeywell Home CT87K1004 The Round Heat Only Manual Thermostat
- Honeywell Home CT87N1001 The Round Non-Programmable Manual Thermostat, Large, White

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*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-01-25*