I think it could be possible to use ammonia in domestic refrigerators safely if appropriate measures were taken. Particularly, require that refrigerators be in

I think it could be possible to use ammonia in domestic refrigerators safely if appropriate measures were taken. Particularly, require that refrigerators be installed with vent pipes leading from a tamper-resistant enclosure straight to the outside. Such vents would be similar to those used in waste plumbing to protect people from toxic sewer gasses like hydrogen sulfide: https://en.wikipedia.org/wiki/Drain-waste-vent_system https://en.wikipedia.org/wiki/Drain-waste-vent_system But jabl is probably right and something like propane would make more sense.