--- product_id: 1611847 title: "Honeywell Home CG512A1009 Large Thermostat Guard, Fits Thermostats 8. 25\" W x 5. 75\" H or Smaller, Hand Control" brand: "honeywell home" price: "1704131β‚«" currency: VND in_stock: true reviews_count: 13 category: "Honeywell Home" url: https://www.desertcart.vn/products/1611847-honeywell-home-cg512a1009-large-thermostat-guard-fits-thermostats-8-25 store_origin: VN region: Vietnam --- # UV & chemical resistant clear cover Secure key lock system Tamper-proof inner shelf Honeywell Home CG512A1009 Large Thermostat Guard, Fits Thermostats 8. 25" W x 5. 75" H or Smaller, Hand Control **Brand:** honeywell home **Price:** 1704131β‚« **Availability:** βœ… In Stock ## Summary > πŸ” Lock in comfort, lock out chaos β€” your thermostat’s new best friend! ## Quick Answers - **What is this?** Honeywell Home CG512A1009 Large Thermostat Guard, Fits Thermostats 8. 25" W x 5. 75" H or Smaller, Hand Control by honeywell home - **How much does it cost?** 1704131β‚« with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/1611847-honeywell-home-cg512a1009-large-thermostat-guard-fits-thermostats-8-25) ## 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 - β€’ **Crystal Clear Protection:** Ultra-clear acrylic resin cover resists yellowing from UV light and chemicals, maintaining sleek visibility year-round. - β€’ **Effortless Universal Fit:** Designed to fit all Honeywell and most other thermostats up to 8.25" W x 5.75" H, ensuring seamless installation. - β€’ **Peace of Mind, Instantly:** Heavy-duty lock and durable construction provide reliable defense in both commercial and residential spaces. - β€’ **Unbreakable Climate Control:** Lock down your thermostat settings with a robust key lock and inner shelf to prevent unauthorized changes. - β€’ **Minimalist Design, Maximum Impact:** Sleek, clear casing blends into any environment while safeguarding your heating and cooling preferences. ## Overview The Honeywell Home CG512A1009 Large Thermostat Guard is a lockable, clear acrylic cover designed to fit Honeywell and most other thermostats up to 8.25" W x 5.75" H. It features a tamper-proof inner shelf and a heavy-duty key lock to prevent unauthorized adjustments. The UV and chemical-resistant cover ensures long-lasting clarity and protection, making it ideal for both residential and commercial use. ## 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:β€’ RTH8xxxx Family β€’ RTH7xxxx Family β€’ RTH6xxxx Family* β€’ RTH5xxxx Family* β€’ RTH4xxxx Family β€’ RTH3xxxx Family β€’ CT5x Family β€’ CT3x Family Must mount off center in order to allow room to open battery door on Honeywell models Review: Good quality - They are made a little cheap.But they really do the job.I recommend the product.Just be very careful opening and installing this product Review: 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. ## 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 | | Additional Features | Lockable | | Backlight | No | | Best Sellers Rank | #36,466 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #28 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 3,448 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 8.25"W x 5.75"H | | Item Type Name | Thermostat Guard | | Item Weight | 1.3 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 | | Mounting Type | Wall Mount | | Power Source | Manual Winding | | Product Dimensions | 3.25"D x 8.25"W x 5.75"H | | Product Style | Minimalist | | Screen Size | 5 Inches | | Shape | Rectangular | | Smart Home Compatibility | Not Smart Home Compatible | | 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 | ## 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 ![Honeywell Home CG512A1009 Large Thermostat Guard, Fits Thermostats 8. 25" W x 5. 75" H or Smaller, Hand Control - Image 1](https://m.media-amazon.com/images/I/41zZHVzmZbL.jpg) ![Honeywell Home CG512A1009 Large Thermostat Guard, Fits Thermostats 8. 25" W x 5. 75" H or Smaller, Hand Control - Image 2](https://m.media-amazon.com/images/I/81-qWu9jegL.jpg) ![Honeywell Home CG512A1009 Large Thermostat Guard, Fits Thermostats 8. 25" W x 5. 75" H or Smaller, Hand Control - Image 3](https://m.media-amazon.com/images/I/517x-0Y38OL.jpg) ![Honeywell Home CG512A1009 Large Thermostat Guard, Fits Thermostats 8. 25" W x 5. 75" H or Smaller, Hand Control - Image 4](https://m.media-amazon.com/images/I/61VBnrPfHNL.jpg) ![Honeywell Home CG512A1009 Large Thermostat Guard, Fits Thermostats 8. 25" W x 5. 75" H or Smaller, Hand Control - Image 5](https://m.media-amazon.com/images/I/61pGkxBiXmL.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 ### ⭐⭐⭐⭐⭐ Good quality *by N***R on February 25, 2026* They are made a little cheap.But they really do the job.I recommend the product.Just be very careful opening and installing this product ### ⭐⭐⭐⭐⭐ Super Big! *by C***E on September 5, 2024* 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. ### ⭐⭐⭐⭐⭐ 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 ## 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? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.vn/products/1611847-honeywell-home-cg512a1009-large-thermostat-guard-fits-thermostats-8-25](https://www.desertcart.vn/products/1611847-honeywell-home-cg512a1009-large-thermostat-guard-fits-thermostats-8-25) --- *Product available on Desertcart Vietnam* *Store origin: VN* *Last updated: 2026-06-07*