Look on freecycle, Craig's list, and ask around the neighborhood. It seems one out of five homes has an old, somewhat working window shaker or dehumidifier lurking in a dark place. Once people saw me resurrecting the dead, orphans began showing up out of nowhere. I'm not a hoarder, so i had to start refusing them.
Yes, R410a compressors can run R-290 but you lose capacity. The metering device has to be messed with as well. This has been discussed before here. R-134a can be used as well.
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