As the video states, a couple aspects of the point of drying a small load with FanFresh is energy savings and convenience of largely loading-and-forgetting if the items aren't needed immediately.  Cold air surely can dry clothes.  Drying is simply evaporation of moisture.  Cold, or non-heated, air just takes longer.  I don't have an outdoor clothesline, so I've hung items for drying inside the house in my spare bedrooms and bathrooms.  An item washed separately that bleeds rather than running it through the dryer.  Items that may shrink if heat-dried.  For a while to avoid ironing, I'd spin my cotton oxford shirts at the lowest speed, place them on hangers to dry inside in the spare room, sometimes with ceiling fans running.  They'd be dried by the next evening.