R-417A

R-417A is miscible with mineral oil (MO), the historical R-22 lubricant. For most R-22-to-HFC retrofits the largest service expense is draining the mineral oil and replacing with POE; R-417A's 3.4% R-600 (n-butane) hydrocarbon component aids miscibility enough that the original mineral oil can stay in the system. This eliminates the oil-change step entirely — typically saving several hours of labor and the cost of the POE replacement oil per service call.

R-407C has lower GWP (1774 vs 2346) and slightly better capacity match to R-22, but requires a POE oil change. R-417A has higher GWP but works with the existing mineral oil. R-407C is the better refrigerant from a climate-impact standpoint; R-417A is the better refrigerant from a service-cost standpoint. The choice depends on whether oil-change avoidance is operationally critical and whether the equipment is expected to remain in service long enough for the GWP difference to matter.

Slightly lower than R-22 across the envelope (~5-10% lower). On a residential AC system at 95°F outdoor ambient retrofitted from R-22 to R-417A, expect roughly 55-70 PSIG suction and 215-260 PSIG discharge — modestly lower than R-22's 65-75 / 240-280. The capacity match is reasonable but produces about 5-8% lower cooling output for the same compressor displacement.

Yes — about 7-8°F at typical evaporator pressures. This is comparable to R-407C and meaningful enough that TXV operation should be reviewed after retrofit. EXV systems handle the glide automatically; fixed-orifice systems are less affected because they don't rely on TXV-based superheat control. For superheat measurement use the dew curve as the saturation reference (the site's superheat calculator handles this automatically).

Production continues for the retrofit market but at declining volumes as the R-22 installed base shrinks. AIM Act phase-down constraints reduce supply over time. For new R-22 retrofit work R-417A remains commercially available; long-term supply for service of past retrofits will depend on continued production decisions and the reclamation market.

Economics-dependent. R-417A retrofit costs less than full equipment replacement and preserves the existing investment. Full equipment replacement provides a modern R-454B / R-32 system with substantially lower GWP, higher efficiency (SEER2 ratings exceed legacy R-22 systems by 20-30%), and longer expected service life. For R-22 equipment less than ~10 years old in good condition with no other major issues, R-417A retrofit can be the right economic choice; for older equipment with multiple issues, replacement is typically preferred.

2346 (IPCC AR5, mass-weighted from components). For context: R-22 GWP is 1810 — R-417A is actually slightly higher GWP than the R-22 it replaces, which is part of the AIM Act's structural challenge with retrofit blends. The R-417A appeal is operational (no oil change) rather than climate (its GWP is comparable to R-22's).