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R-32 vs R-454B: the mini split refrigerant change explained

Mini splits are switching off the old R-410A refrigerant to two lower-impact replacements - R-32 and R-454B. For a buyer in 2026 the practical takeaway is simple: buy a current unit on either R-32 or R-454B (both are compliant and future-proof), and be cautious about an R-410A unit unless it's a genuine closeout bargain, because that refrigerant is being phased down and will get costlier to service. Here's what the change is and which brands use which.

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Why the change happened

Under the U.S. AIM Act, the industry is phasing down high-global-warming refrigerants. R-410A - the standard for the last two decades - has a high global-warming potential, so new equipment moved to lower-GWP replacements starting in 2025. The replacements, R-32 and R-454B, are both "A2L" refrigerants (mildly flammable, which changes some handling and code details - a pro's concern, not yours).

R-32 vs R-454B - the honest, homeowner-level difference

For the person living with the system, the difference is small:

  • R-32 — a single-component refrigerant with a GWP around 675. Easy to recharge (no blend to worry about). Common on imports and value brands (Gree, Senville's newer lines, Midea, Cooper & Hunter).
  • R-454B — a blend with a lower GWP (~466). Used by several premium brands (Mitsubishi, Carrier, Bosch, and parts of Daikin's range).

Both cool and heat the same from your chair. R-454B is a bit greener; R-32 is a bit simpler to service. Neither should make or break your buying decision - efficiency, sizing, install path, and price matter far more.

What actually matters for buying in 2026

  • Prefer current A2L (R-32 or R-454B). Both are compliant and will be supported for the long haul.
  • Be careful with R-410A stock. New R-410A units are largely phased out; what's left is often older or closeout inventory. It still works, but the refrigerant is being phased down, so future top-offs and repairs get more expensive and harder to source. A closeout R-410A unit can be a fine deal if the price reflects that - just go in eyes open.
  • Check the exact SKU. Some lines are mid-changeover (Senville's AURA moved to R-454B; older Leto stock may still be R-410A). We publish the refrigerant on every Senville AURA 12k 230V - confirm it there.

Which of our brands use what

From our verified catalog: Mitsubishi, Carrier, Bosch are on R-454B; most imports (Gree, Midea, Cooper & Hunter) are on R-32; Senville is moving R-410A -> R-454B; older Daikin Entra is R-32 but discontinued. See each on the brand hubs, and compare current systems in the product finder.

FAQ

Is R-32 or R-454B better? For a homeowner, negligibly different - both are compliant low-GWP A2L refrigerants. R-454B has a lower global-warming potential; R-32 is simpler to recharge. Choose the unit on efficiency, sizing, and price, not the refrigerant.

Should I still buy an R-410A mini split? Only as a clear closeout bargain. New R-410A is being phased out, and future servicing will cost more as the refrigerant is phased down. A current R-32 or R-454B unit is the future-proof choice.

Are R-32 and R-454B flammable? They're "A2L" - mildly flammable, which affects professional handling and code, but they're safe in normal home use.

How do I know which refrigerant a unit uses? Check the model's spec sheet - we publish the refrigerant on every model page.

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