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On a chest freezer, frost always accumulates around the top perimeter first because the warmer moist air comes in contact with that area first once the door is opened. More frequent defrosting may be the answer.
Yes, the freezer temperature means the lid gets very cold. Every time you open it some moisture condenses in the lid and the outside ambient also affects it. The insulation may be beginning to break down and the ice is forming inside. It is not a major problem however and many freezers go on for years with freezing lids!
If all is ideal maybe -10 an occationally -15 and this is F considerable coolder than -20C. ALSO fyi a chest freezer will stay at or below these temps better than an upright and especially a self defrosting model. Because a chest freezer you dont loose all the cold air when you open the door. TYhey are not made in auto matic defrost as far as I know (never have seen one but then I havent been looking for one either. An up right freezer can be manual defrost or automatic. but the cold air falls ouit every time the door is opened.
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