If you can plan ahead to wash and dry several loads of laundry at a time you will save money and energy. Each time you start the dryer the interior drum must heat up. This can put a strain on your machine.By doing several loads in succession, it stays warm so it is easier for it to heat up. Always check the dryer hose (behind the machine) to be sure it is kink-free. Lint can get  trapped causing your dryer to run slower and, most of all, a potential fire hazard.