What would make more sense would be if a safe way were developed to use propane not as an energy source to drive the refrigeration cycle, but as the refrigerant itself. Propane is an excellent refrigerant, but as we all know it's also combustible.
It takes less propane to charge the system than any of the traditional R-whatever refrigerants, so the compressor doesn't have to work as hard to achieve the same results. Consequently, the compressor starts easier and it consumes less power.
It's my understanding that most of the new residential refrigerators in the EU use propane as the refrigerant. But, they've had a few accidents with them as well.
:):)