This might not be a relatable question to anyone who doesn’t work in food service or otherwise have regular access to large walk-in freezers. When the air temperature outside is warm (or even in commercial kitchens, hot) going into the walki-in cooler or freezer can be a refreshing respite from the heat. But when the seasons shift and the air temps start to get colder, it feels like the same walk-ins are almost bitingly cold. Why does it feel colder in there when I’m already cold than when I’m hot?
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Does your walk-in include a heat exchanger on the outside of the building? If yes, the compressor is able to dump more heat to the cold outside air in winter than in summer. So when the refrigerant expands in the interior coils for air to be blown across it, it will drop to a lower temperature than in summer.
The temperature setting on refrigerators, freezer, and air conditioners are mostly just controlling how long the unit runs for. All the environmental conditions, like ambient temperature inside and out, dictate how cold the air is that is produced by these systems before they are mixed in with whatever air is meant to be cooled.
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