On: Gravity to Save 90% Energy When Using a Fridge

[a-priori]

You could probably get away with one if you duct the cold air into each compartment, with a valve on each one. The valves would be opened and closed as needed to maintain the temperature in each compartment. When at least one is open, the compressor turns on; when all are closed, it shuts off.

[swombat → a-priori]

Here's a crazy idea: could you design a house this way?

Perhaps, for very hot climates, houses should be designed so that the air can only escape upwards, which would severely reduce cooling costs?

(most likely, they already are...)