

Enhance the functionality of your T855S thermostat with the R251S Indoor Temperature Sensor. This wired sensor, compatible with T755S, T855S, and T955S PRO1 thermostats, measures 1.75"W x 0.25"H x 0.25"D and operates on 24V power. Easily install this sensor to ensure precise indoor temperature readings for optimal comfort. We know appliances inside and out and will help you find the right part with expert, honest advice.