I see all sorts of answers online, but am not fully convinced. I tried finding some research on the longevity of clothes between wash and wash + dry. Considering that it dries for hours just the mechanical movement should damage the clothes I would assume?
Yup, what other person said, heat pump dryers.
They use the insides of the dryer as the closed loop of heating and cooling. Heating air through clothes to get moisture then cooling it on the other side to condense it. Generates water but doesnt have a vent.
Neat use of the tech.