The dryer door, on the other hand, should always be left closed, IMO.
Some people type IMHO. They are usually people who should type IMAO. My opinion is neither humble nor arrogant, it just is, so I write IMO.
I have noticed that when the family leaves our dryer door open in the winter, cold air flows in from the vent into the house. So I stay after them to keep the door closed.