I hope this helps you. The evaporator will not need to be removed to replace the thermostat. To replace the thermostat on this window a/c, the front grill will need to be removed first and also disconnect the power cord. With the front grill off, pull the unit out slightly to access, the front control panel. Remove the control panel cover and you will be able to see and remove the thermostat. Pay attention to how the thermostat is mounted and how the cap tube is run. Also how the wires connect to the thermostat. Sometimes removing the top cover will help give easier access, to the control panel.