Using this Westinghouse freezer thermostat is quite straightforward. First, make sure your freezer is unplugged. Then, locate the old thermostat and carefully remove it, taking note of how the wires are connected. Next, install the new thermostat in the same position, connecting the wires to the correct terminals. Once it's installed, plug the freezer back in. As for maintenance, keep the thermostat clean and free from dust. If you notice any issues like inconsistent temperatures, check the connections first. Also, be careful when handling the capillary as it's a delicate part. With proper use and maintenance, this thermostat will serve you well for a long time.