I know this has been discussed to death (but not for my application). I've been happily using R-22 in the MT/HT 45°F coil temp (75# suction). Mostly fractional sized condensers with mineral oil, TXV.
I've read and heard of some seal issues but that seems to affect retrofits.
I've also heard of some oil return issues but that seems to affect LT systems more.
I've got decent supplies of R-22 and plan to load up on some more before the pricing gets worse but it won't last forever
Any thoughts, concerns, experience with this stuff?
What would you do?
PS...I've been using Tecumseh CU units and they do offer them in R134a and R404A but both suffer capacity loss and use POE