Using this Westinghouse bar fridge thermostat is easy. First, make sure your fridge is unplugged for safety. Locate the old thermostat and carefully remove it. Then, install the new thermostat using the 3/8' screw mounting. Attach the capillary to the evaporator as it was on the old one. Once installed, plug your fridge back in. As for maintenance, keep the thermostat clean and free from dust. Check the connections regularly to make sure they're secure. If you notice any issues like inconsistent temperature control, it might be time to give it a closer look or contact a professional. And remember, with our 25+ years of experience in supplying appliance parts, you can rely on this product's quality.