Ammonia Fridges, read an interesting piece a while ago

This article is definitely wrong.

The Norcold stays cold enough to freeze things occasionally in the refrigerator if they are too cloyto the fins, even when over 100F. That's closer to a 70 degree differential.

I'm not even counting the freezer around 10F with fully hard ice cream.

The only time these refrigerators fail is as the temperature gets too cold. They work very poorly in the winter. They stay pretty warm in near freezing temperatures.