More and more clothes dryers have a built-in sensor so that the dryer knows how much laundry is in the drum and exactly how damp it is. Based on this information, the smart dryer can select a wash program and drying time, so your laundry is not dried for too long and is not exposed to heat unnecessarily. In this way you save on your energy bill and your laundry lasts longer too. This sensor is located inside the drum, but its exact location may vary depending on the model and brand. Your dryer’s manual will tell you where the sensor is located. It is important to know exactly where the sensor is, because you will need to clean it somewhat regularly. Only then can the sensor continue to do its job properly and you are guaranteed a perfectly dry wash.