Lennox Thermostat Manuals Lennox Rating 3.3 (votes: 3) Select Model Name Commercial DSL-450LX ComfortSense 7500 5500 L3011C L3021H L3511C L3522C L3532H L3532U L3722C L5732U L7742U Elite X4146 X4147 49M55 49M56 49M57 iComfort S30 E30 M30 Wi-Fi Merit 51M32 51M33 51M34 51M35 51M37 51M38 51M39 51M42