this post was submitted on 18 Sep 2025
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I just saw a poster for a sort-of cool fridge innovation: It has a door-in-the-door that you can open to get out commonly used things without having to open the main door and let all the cold air out. It's called a "Conservadoor" refrigerator.
The kicker is that I saw this on Antiques Roadshow and it's from the 1950s.
I don't know why, but I remember seeing that somewhere, too. Fantastic idea. Ergonomic AND energy efficient. Though, I feel like adding in a mini door somewhat lowers the insulative abilities of the main door, so I'm not sure of the trade-off.
FWIW I don't think it's really all that energy-efficient. Air, being much less dense than solids, contains comparatively much less heat energy. The "cold" of a refrigerator is mostly stored in the things inside it, not in the air inside it, so letting all the cold air out to be replaced by warmer air does not have a huge effect on the overall temperature of the fridge. I think you're right that having a door which interferes with the insulating envelope is going to be worse than just opening the main door once in a while.
We need technology connections to make this experiment a reality