914160-7 Universal Thermostat Guard: Plastic, Snap-On, Clear, Ring Base/Solid Base

Emerson G10 Universal Locking Thermostat Guard, Clear - Household Thermostat Accessories

Emerson F29-0222 Universal Thermostat Guard, Metal, Ring Base

Controls/Electrical Thermostat Accessories

Clear Plastic Thermostat Guard - See Thru - Solid Base

Universal thermostat guard, TG511A1000

Thermostat Protection Cover With Lock Universal Clear Large Thermostat Transparent Protector Guard Cover Box For School Home - AliExpress

Honeywell Thermostat Guard Clear

The Honeywell CG510A1019 Small 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 Small Sized (4 7/16 W x 4 7/16 H x 2 1/4 D or smaller) Honeywell thermostats and a host of others.

Honeywell Cg510a1019 Small Thermostat Guard

Emerson G10 Universal Locking Thermostat Guard, Clear - Household Thermostat Accessories

White-Rodgers Thermostat Guard G10