Honeywell 7-day Programmable Thermostat Easy to use, extra large backlit touch screen display with menu driven programming Precise temperature control of +/ 1 degreesF with auto change from heat to cool. Energy Star Rated 7 day programming with 4 programmable periods per day Compatible with heating and cooling plus heat pump systems Dimension (L x W x H): 1 x 4.75 x 3.4 inches