All the comments about what's needed to make an ammonia absorption cycle refrigerator work, emphasizes why Carrier went with the steam ejector for steam powered A/C.
The steam ejector was one of the first applications of supersonic nozzles and diffusers. The supersonic flow was needed to make sure the steam from the nozzles didn't flow back into the chamber being evacuated. This was followed by a diffuser to slow down the steam and thus increasing pressure - a KEY POINT as it allowed condensation at a higher temperature than the water being evaporated for cooling.
From what I understand, steam ejectors are still being used to make condensed milk.
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