Lennox 39P21 – Honeywell TG512A1009 Versaguard Large Universal Thermostat Guard, Clear Cover

 

The Lennox 39P21 thermostat accessory features the Honeywell TG512A1009 Versaguard Large Universal Thermostat Guard, designed to protect wall-mounted temperature controls in residential, commercial, and industrial environments. This clear, impact-resistant cover prevents tampering, accidental adjustments, and unauthorized access while maintaining full visibility and easy monitoring of thermostat settings. Ideal for property managers, schools, rental properties, offices, and facilities where thermostat security and system efficiency are essential.

Manufactured with a durable polycarbonate construction, the TG512A1009 guard offers superior strength, scratch resistance, and long-lasting performance. Its universal large-size design allows compatibility with a wide range of modern digital and programmable thermostats, including popular Honeywell, Lennox, and other HVAC control models. The clear cover ensures unobstructed viewing, while the ventilated housing prevents temperature-sensing inaccuracies.

This thermostat guard includes a locking mechanism with key access, providing an added security layer to maintain consistent environmental control. Installation is straightforward, with included mounting hardware and a low-profile footprint that fits cleanly on most standard walls.

 

Key Features

• Large universal thermostat guard compatible with many Lennox and Honeywell models
• Clear heavy-duty polycarbonate cover for strength and visibility
• Lock-and-key design for secure access control
• Ventilated housing to maintain thermostat accuracy
• Protects against tampering, vandalism, and accidental adjustment
• Ideal for commercial buildings, multi-tenant units, and controlled environments
• Easy installation with included mounting hardware

 

Technical Specifications

• Model: Honeywell TG512A1009
• Lennox Part Number: 39P21
• Material: Impact-resistant clear polycarbonate
• Size: Large universal footprint suitable for most digital thermostats
• Ventilation: Integrated airflow slots
• Security: Lock-and-key access