@crickxson For folks asking about why does coldbox go CRACK: frost-free freezers work (counterintuitively!) by melting frost with a heating element (the melted frost runs down a hose and into a pan at the bottom of the freezer and evaporates) and during these heating-cooling cycles things can go CRACK (even non-destructively) because of contraction/expansion changing internal tensions.

Things in the fridge can go CRACK sometimes too, even though they're not getting cold enough to freeze.