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Originally Posted by aerohead
My parents home in Lubbock, Texas had an Arkla-Servel, gas-fired, ammonia refrigeration cycle air conditioning system from the 1960s, cooling 2,400-sq-ft.
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Interesting. I'm aware of some gas-powered air conditioning machines, yet it's often mentioned as environmentally-friendly and operating in a way similar to the air-cycling featured to airliners, not requiring any refrigeration fluid.
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Aside from a pump moving a glycol coolant to and from the A-Coil, it was just an overgrown version of the RV, dual-mode refrigerator.
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But was it dual-mode, or gas-powered only?