Saw this over on Hacker News: http://petapixel.com/2016/10/11/cooled-nikon-d5500a-chills-sensor-clearer-star-photos/
Saw this over on Hacker News: http://petapixel.com/2016/10/11/cooled-nikon-d5500a-chills-sensor-clearer-star-photos/
The article says the cooler is built to dehumidify the air before it cools the sensor