> Some fridges have heaters in the door. It's true.

Wow. I had to search this to be sure you weren't kidding:

> In ‘single circuit appliances’ and appliances with a 4-star freezer compartment, temperatures are usually regulated according to refrigeration compartment temperature. When ambient temperatures fall, an issue arises because the refrigeration compartment will not need to be cooled as regularly and this means that the associated 4-star freezer compartment can then become too warm. In such cases, the refrigeration compartment is artificially heated by a light bulb or an electrical heater to force the refrigerator to cool down more frequently and thus keep the 4-star freezer compartment sufficiently cool.

https://blog.liebherr.com/appliances/my/refrigerators-heater...