Resideo TG512A1009 Thermostat Guard Large Clear Plastic

The Resideo TG512A1009 is a large clear plastic thermostat guard designed to prevent unauthorized adjustment of wall-mounted thermostats in residential and commercial applications. It features a double-wall construction with a clear plastic cover, opaque polystyrene wallplate, and clear plastic ring base, secured by a tamper-resistant tumbler lock with two included keys. Outside dimensions measure 7 1/4" H x 9 3/4" W x 3 3/8" D, with an interior clearance of 5 7/8" H x 8 3/8" W to accommodate larger thermostat models. Precision vents maintain airflow so internal sensors read ambient temperature accurately despite the enclosure. This guard is a universal-fit, DIY-installable unit compatible with Honeywell and Robertshaw thermostats, including the Honeywell TH5000, TH6000, and TH8000 Series. It carries the OEM designation TG512A1009/U and cross-references to BB3001, which it replaces. Suited for rental properties, commercial spaces, or any installation where occupants have a history of adjusting setpoints beyond authorized limits.