Can a new City Multi R-32 outdoor unit run your existing R-410A PEFY indoors?

METUS announced in October 2025 that City Multi commercial VRF outdoor units are moving to R-32 refrigerant, driven by the same AIM Act low-GWP rules pushing the rest of the industry off R-410A. METUS was explicit that for the first half of 2026 it would keep shipping R-410A VRF product in parallel with the new R-32 line, which means a City Multi quote assembled during the transition can pull equipment from two different refrigerant generations without anyone flagging it. An outdoor unit ordered fresh off a new-generation catalog and an indoor unit quoted off an older submittal or pulled from existing distributor stock can both look correct on paper and still be unable to run together.

This is not a compatibility setting or a control-board configuration. A VRF refrigerant circuit is a single sealed loop charged with one refrigerant. R-32 and R-410A have different pressures, different oils, and different physical properties. There is no adapter, no field conversion, and no partial fix. If the outdoor unit is R-32 and the indoor unit is R-410A, the system cannot be commissioned as designed.

The PEFY-P-NMHSU-E high-static ceiling-concealed ducted indoor family, the workhorse for office, retail, and institutional ducted VRF in NYC, is documented as R-410A across Mitsubishi's current databook, submittals, and distributor listings. As of this writing, no R-32 equivalent for this high-static ducted family had appeared in Mitsubishi's public catalog or press materials. That may change as the R-32 lineup fills out through 2026 and beyond; anyone speccing a City Multi ducted job should confirm the current indoor catalog at order time rather than assume last year's submittal still applies.

The family tops out at the PEFY-P96NMHSU-E: 96,000 BTU cooling, 108,000 BTU heating, roughly 49 inches wide by 44 inches deep, on a single-phase 208/230V circuit. There is no P120 or P144 above it. A job that needs more capacity than one P96 can deliver gets there with additional indoor units, not a bigger single unit, which changes the duct layout and zoning conversation, not just the equipment list.

Confirm refrigerant on the outdoor unit model number, and confirm it again on every indoor unit model number, even when both come from the same manufacturer and the same VRF family. Do not assume a matched refrigerant generation just because the outdoor and indoor units are both City Multi. On a replacement job where only the outdoor condenser is failing, check whether the existing indoor units can stay in service on a like-for-like R-410A outdoor replacement, or whether the whole refrigerant circuit needs to move to the new generation together.

Daikin VRV is moving through its own refrigerant transition on its own schedule, separate from Mitsubishi's. The lesson holds regardless of brand: during any manufacturer's multi-year refrigerant transition, confirm the refrigerant on every piece of equipment in a VRF quote individually, rather than assume the whole system moved together. See the Daikin VRV installer page at /daikin-vrv-installer-nyc.