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We need to figure out how to retrofit those old machines to be as efficient as the new ones, and be clean and pigeon free. Then we can keep them around.
The difficulty (just looking at the refrigerant) is the huge differences in pressure needed between refrigerants.
Then you have to look at the compatibility of the compressor motor oils and the refrigerant.
One example
60 PSI to 85 PSI for R-22 and 105 PSI to 143 PSI for R-410A
Others:
Makes sense. Very different tolerances and tooling required
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