Using this universal freezer thermostat kit is easy. First, make sure your freezer is the right type (most chest and upright freezers without a temperature warning indicator light). It won't work for frost - free freezers. Install the mounting bracket that comes with the kit in the appropriate place in your freezer. Then attach the thermostat and connect it properly. Use the universal knob to set the temperature as you like. When using it, remember to keep an eye on your freezer's performance. If you notice any unusual changes in temperature, check the connections. For maintenance, keep the thermostat clean. You can use a soft, dry cloth to wipe it regularly. If there are any issues, feel free to contact us as we have over 25 years of experience in this field and can help you out.