Customer Reviews For The Honeywell Home Small Thermostat Guard - CG501A

This small lock box is ideal for thermostats measuring up to approximately 4 7/16 in. W x 4 7/16 in. H x 2 1/4 in. D or smaller. If your thermostat is larger, consider the Honeywell Medium or Large Thermostat Lock Box. This thermostat guard is compatible with the following Honeywell Thermostats:

• The Round Style Thermostats
• CT87 (Round) Models
• CT3x Family Thermostats (CT30, CT31 and CT33 models without the wall plate)
• RTH5100B Thermostat

Yes. This guard was specifically designed to fit Honeywell Round Style Thermostats (CT87 models). It also fits the CT3x family (such as CT30, CT31, and CT33) when they are installed without a wall plate, and the RTH5100B series.

The inner shelf is a security measure located behind the ventilation slots. It prevents someone from using a thin tool, like a paperclip or a piece of wire, to reach through the vents and tamper with the thermostat’s buttons or temperature levers.

The casing is UV and chemical resistant, which prevents the clear plastic from yellowing or becoming brittle when exposed to sunlight. While it is durable enough for various indoor environments like offices or garages, it is not waterproof and should not be used in areas where it will be directly exposed to rain or heavy moisture.