R-32 vs R-410A refrigerant

Refrigerant type appears on spec sheets and almost nobody knows what to do with it. The short version is that it is an environmental specification rather than a performance one — and the certified data shows an industry-wide change already most of the way through.

GWP measures how much a gas contributes to warming relative to carbon dioxide over a fixed period, with CO₂ set at 1. A refrigerant with GWP 2,088 released to atmosphere has roughly 2,088 times the effect of the same mass of CO₂.

The ENERGY STAR datasets publish both the refrigerant and its GWP:

This only matters if refrigerant escapes. A sealed system is not supposed to lose any — which is why refrigerant is not a consumable and why a unit needing a top-up has a leak. More on that. Over a fleet and a product lifetime, some does.

We pulled the complete certified datasets for both categories, and the contrast is sharp enough to be genuinely useful when shopping.

Two findings worth acting on.

Every certified room air conditioner is R-32. Not most — all 485. Window units, through-the-wall units, cooling-only and reverse-cycle alike. If you buy a certified room air conditioner today, the refrigerant question is already answered and there is nothing to choose between.

Mini-splits are mid-transition, and 38.4% are still R-410A. Nearly four in ten certified units. So in that category the refrigerant line on the spec sheet is a real differentiator, and it is worth reading.

Also notable: the mini-split field went to R-454B rather than R-32 — 45.6% against 16.1%. Two categories facing the same regulatory pressure picked different replacements, and the mini-split choice has the lower GWP of the two.

The natural worry about an environmentally-driven change is that performance was traded for it. The certified figures do not support that.

In the room air conditioner category the evidence is about as direct as it gets: every unit is R-32, and the field contains the highest CEER figures the category has ever recorded — 17.6 at the top, 16 in the 8,000 BTU class, and 171 of 485 units on the Most Efficient list.

In mini-splits, where all three refrigerants coexist, the top of the field reaches SEER2 35.1 and EER2 19.1. Those maxima are not confined to one refrigerant.

The honest framing is that efficiency is driven by compressor and coil design, not by refrigerant choice. All 485 certified room units also have variable-speed compressors — another complete conversion, and one that does explain the efficiency figures.

Buying a certified room air conditioner: nothing to decide. It is R-32, GWP 675, with a variable-speed compressor. Choose on capacity, CEER and format instead.

Buying a mini-split: read the refrigerant line. Nearly four in ten certified units are still R-410A at GWP 2,088, against 470 for R-454B. Given that efficiency does not track refrigerant, taking the lower-GWP option costs you nothing.

Buying a portable: you are outside the certified program entirely, and R-410A is still common there. That is one more item on a list that already includes no certified efficiency figure and a 14-to-50% capacity haircut.

Servicing an existing R-410A system: keep it. Replacing working equipment for refrigerant reasons alone means manufacturing a new machine and disposing of a functional one, and a well-maintained sealed system should not be releasing anything. Fix leaks promptly, and change the equipment when it is due.