The Johnson Controls A421GBF-02 Electronic Temperature Control is a simple and accurate solution for maintaining consistent temperatures in HVAC systems. This lightweight unit (0.9 lbs) has a high-impact plastic shell for durability and may be mounted easily on walls or within electrical panels. A crisp LCD display indicates the current temperature and control status. https://www.partshnc.com/24v-spdt-40212f-6-sen-nema1