WHITE-RODGERS UNIVERSAL THERMOSTATS - Reliable performance in an attractive design. Features: ò Rugged Snap-Action contacts. ò Adjustable heat anticipator. ò Bi-metal thermometer. ò Compatible with most 24-volt and millivolt heating & cooling systems. ò Heat/ Cool model includes switching subbase, and is compatible with electric heat systems. ò Classic White. ò Size: 3-3/4" H x 2-7/8" W x 1-1/2" D. Heating Only.