Using this Westinghouse freezer thermostat is easy. First, make sure your freezer is unplugged for safety. Then, carefully remove the old thermostat. Line up the new thermostat's mounting holes (which are 54mm apart) with the holes in your freezer. Connect the 4.8mm spade terminals correctly. Once it's installed, plug your freezer back in. As for maintenance, keep the thermostat clean. Wipe it gently with a dry cloth from time to time. If you notice any issues like inconsistent temperature control, check the connections first. And remember, always unplug the freezer before doing any maintenance. With proper use and care, this thermostat will serve you well for a long time.