The ComfortSense® 8500 is versatile thermostat designed specifically for commercial applications. It is compatible with premium Lennox® rooftop units featuring the Prodigy® Control System and offers up to four stages of heating and cooling and variable speed operation when used with the Energence® Ultra-High-Efficiency 3- to 6-ton units. A broad range of ENERGY STAR® qualified units help control energy expenses for low total cost of ownership while delivering exceptional IAQ.