R-410A vs R-32

What changes in the field

R-32 runs slightly above R-410A. From the PT data, R-32 is 2.6 psi higher at 40°F evaporating, and at 100°F condensing it is 325.7 psig against 318.5 psig for R-410A. Across the table the difference stays around 2%, so a gauge set to the wrong refrigerant gives a believable but wrong saturation temperature. Set the manifold to the nameplate refrigerant.

R-32 is one of the two components of R-410A, and it is a single-component fluid with zero glide. Like R-410A, it reads off one PT column. It does not fractionate, so a leak does not shift the composition of what is left in the system. Danfoss still specifies the initial charge as liquid at the condenser outlet or filter-drier. Charge fixed-orifice systems to target superheat and TXV/EEV systems to subcooling per the nameplate.

Both use POE oil. Copeland lists POE-46 for its R-32 compressors and POE-32 for R-410A, so use the oil on the compressor label, not whatever is on the truck. See refrigerant oil types.

R-32 is class A2L. Recovery machines must be certified for flammable refrigerants under 40 CFR 82.158 Appendix B4 (UL 1963 Supplement SB). New cylinders are light green-gray RAL 7044 with a red band. Many A2L cylinders use left-hand thread valves, so carry the right adapter.

Retrofit or replacement

An R-410A system cannot be converted to R-32, and the close pressures do not change that:

1. EPA’s SNAP listing (86 FR 24444) accepts R-32 in residential and light commercial AC only in new equipment that meets use conditions based on UL 60335-2-40. Those use conditions cover charge limits and, where required, leak detection and mitigation.
2. Copeland says A2L refrigerants must not be retrofitted into non-A2L compressors or equipment.
3. Arkema states: “There is no retrofit or drop-in replacement for R410A.”

R-32 adapters and “conversion kits” do not make an R-410A unit an A2L-listed appliance. Repair a failed R-410A system with R-410A, or replace it with matched R-32 equipment. Repairing existing R-410A equipment remains legal. For the full rules, see R-410A phase-out and the R-410A replacement comparison.

Capacity, efficiency and cost

Arkema describes R-32 as having “higher capacity and better efficiency over R-410A,” and says its low density allows a smaller refrigerant charge. Arkema sells R-32, and it gives no figure on that page, so no percentage is quoted here. Compare the AHRI ratings of the actual matched systems.

On GWP (AR4), R-410A is 2,088 and R-32 is 675. That keeps R-32 under the 700 limit in 40 CFR 84.54 for new residential and light commercial AC and heat pumps (Jan 1 2025) and VRF (Jan 1 2026). Both are HFCs, so both fall under the AIM Act allowance phasedown: 60% of baseline in 2024–2028 and 30% in 2029–2033.

Common questions

Which cools better, R-410A or R-32?

The only performance claim in these sources is Arkema’s qualitative one in favor of R-32. Cooling output depends on the equipment, so compare rated capacity and SEER2 of the specific systems.

Can you put R-410A in an R-32 system?

No. The system is designed, tested and labeled for R-32, its compressor oil and charge are specified for R-32, and the nameplate refrigerant is the only one to use.

Is R-32 the same as R-410A?

No. R-410A is 50% R-32 and 50% R-125 by mass. R-32 alone is mildly flammable (A2L) and has a much lower GWP.