Electrical Rating: Battery Power ........................ 20 to 30 VAC, NEC Class II, 50/60 Hz Input-Hardwire........................ 20 to 30 VAC, NEC Class II, 50/60 Hz Terminal Load.....1.5 A per terminal, 2.5A maximum all terminals combined Setpoint Range .................................. 45F to 99F (7C to 37 C) Rated Differentials (@ 6F/ Hr): Fast Med Slow Heat Pump (Heat)................................ 0.9F 1.2F 1.7F Heat Pump (Cool)................................ 0.9F 1.2F 1.7F Auxiliary Heat...................................... 0.5F 0.75F 1.9F Operating Ambient.................................. 32F to +105F (0C to +41C) Display Temperature Range ....................... 32F to +99F (0 to 37C) Operating Humidity ................... 90% non-condensing maximum Shipping Temperature Range......... -20F to + 150F (-29 to +65C) Thermostat Dimensions........................... 3-3/4inch H x 6inch W x 1-1/8inch D