Just like a quarterback needs a guard for protection, so too does your thermostat. Thermostat guards vary in size, color and material, so choose accordingly. In addition to tamper-proofing guards, you can also find thermostat covers, lock boxes, sensors and more. If you need to replace your thermostat altogether, view our lines of low-voltage thermostats and line-voltage thermostats. Get me a thermostat guard, stat!.