with some getting significantly warmer after only 9 hours. You will have to check out their article for the details. One trick I have read about to help with this, is to store a couple of plastic galleon jugs of water (if you have space), that will freeze into large ice cubes. If the power goes out, these will help keep the freezer colder longer. Remember water expands when if freezes, so make sure that the contains are only about 2/3 full when you go to freeze them