The Temp H/C-3 Temperature Controller is our most recent development in temperature control. It is switchable between heat and cool. Designed specifically for the control of plant growth and related environments. Has a 32 inch remote bulb sensor. Perfect for plant zone environments, reptile habitats or any other application requiring automatic switching of heating and cooling equipment. The black anodized aluminum enclosure is durable and attractive and will never corrode or discolor from hot, cold or humid environments. Comes with a 3 differential. This control operates AC, exhaust fans, evaporative coolers, heaters or other temperature equipment by activating switches, motors, valves or pumps. Temperature range 40 to 110 F (5 to 45 C)