LockState Connect LS-90 Programmable Thermostat Easy to use menu system with large backlit touch screen display and works with nearly every HVAC system - including traditional furnaces and heat pumps Able to control 3 stages of heat and 2 stages of cool, this allows for more precise temperature regulation and less fluctuation with today's most sophisticated HVAC systems True Auto mode to switch automatically between heat and cool depending on environmental factors and program up to 7 independent periods per day Requires common 24V "C" wire or separate 24 VAC adaptor; Connections: C, H, B, O, W, W2, W3, Y1, Y2, RH, RC, G, A, DH, EX Target Temperature Range: 47F to 95