A:Answer Hi, gypsySC! If the door is slightly open, warm air can enter the unit causing moisture. Whenever the door is opened, ensure that the door is closed afterwards. Ensure the door gasket is fully seated in the retaining channel. If you need additional assistance, please contact us directly at 1-888-203-1389 M-F from 8a-8p or Sat from 9a-6p EST. ~ Brandi