So I'm sitting in my kitchen a few minutes ago, having some dinner and listening to my refrigerator compressor hum away, turning warm air into cold. Hmmm
Am I the only one struck by the sheer absurdity of MAKING cold air when just several feet away, outside the wall, sits trillions of cubic feet of air, already cold and free for the taking? How hard would it be to pipe small, metered, portions of said air into the frig through some kind of thermostatically-controlled valve or something?
It might require new compressor designs and maybe some re-thinking of kitchen layout but, at least where I live, refrigeration would be free half the year. I'd take that.