Honeywell Home CG512A1009 Large Thermostat Guard - Fits 8.25W x 5.75H or Smaller

Protect your thermostat without sacrificing visibility or control

The Honeywell Home CG512A1009 Large Thermostat Guard offers a sturdy, year‑round shield for your control panel. Engineered to fit most large thermostats up to 8.25W x 5.75H x 2.75D, this guard also accepts a wide range of Honeywell models and other brands. The result is a discreet yet protective barrier that keeps the display and controls accessible while preventing unintended changes.

Crafted with a crystal-clear acrylic window, the cover remains visually unobtrusive while giving you a crisp view of the thermostat settings. Its materials resist yellowing from UV exposure and common household chemicals, helping the guard stay transparent and easy to read over time. The integrated key lock adds a practical layer of security, backed by a universal key and heavy‑duty lock that work together to deter tampering without complicating everyday use.

One thoughtful design detail is the off‑center mounting option, which leaves space to open battery doors on many Honeywell models. This means you can install the guard with minimal disruption to routine maintenance and regular thermostat access.

Key benefits at a glance

• Universal compatibility with Honeywell and many other thermostats
• Clear, UV- and chemical-resistant acrylic cover for year‑round clarity
• Lockable access via a universal key and inner shelf to deter tampering
• Protects preferred climate settings from unintended changes

Fit, use cases, and maintenance

• Fits large sized units up to 8.25W x 5.75H x 2.75D; off-center mounting to allow battery door access
• Crystal-clear visibility helps you monitor controls at a glance
• Chemical- and UV-resistant shell supports long-term use in homes and small workplaces
• Easy, tool-light installation with included universal key and hardware