I'm having a whole bunch of freezer systems moved from old freezers to new

they almost all run on R404a


talked to engineer about swapping to a different gas now, the thinking being r404 will be harder and harder to work with in the future

we pondered about r290.... condensing units are all outside in fresh air, short pipe runs to evaps, would need to swap to explosion proof lights inside the freezers and add alarms

but... there doesn't seam to be a lot of that going on?

reluctant to switch to another gas now that will be phased out later on


if we swapped a few systems over now, could recover the 404 and save it for the other systems later on


can't see a lot of info about r290 in older scroll compressors?

anyone have any ideas/input?