Over here in Germany I am seeing those fridges getting doors when supermarkets are being renovated as well. But still many open ones exist. (While I assume tha

Over here in Germany I am seeing those fridges getting doors when supermarkets are being renovated as well. But still many open ones exist. (While I assume that some of those are opened quite often, where shutting doors might push a lot of warm air back in, while keeping them open with less air movement might even be more efficient)