Line Voltage, SPDT Thermostat, 36F To 90F Range, 1.5F Differential, Setpoint, Locking Option, Range Limiting Option, Heating: 16A At 120 VAC; 4A At 240/277VAC. Cooling: 8A At 120 VAC; 4A At 240/277 VAC, May Be Used With S29-21or S29-22 Switching Subbases