When HVAC residential shipments fell more than 25 percent year-over-year in 2025 — and at times approached 50 percent declines — industry analysts and OEM executives pointed to consumer deferral, elevated equipment prices, and post-boom inventory correction as the primary causes. All of those factors were real. But Trane Technologies' group president of Americas, Donald Simmons, disclosed a fourth factor that received far less attention: 'None of us predicted that with the refrigerant change, there would have been a canister shortage.'

The R-454B canister shortage is the untold story of the 2025 residential HVAC market disruption — a supply chain failure in the packaging and logistics of the new refrigerant that compounded the equipment transition disruption and contributed to the severity of the residential market decline in ways that most industry analysis underweighted.

What the Canister Shortage Was

When the residential HVAC industry transitioned from R-410A to R-454B on January 1, 2025, the logistical requirements changed simultaneously:

• Different container specifications: R-454B, as an A2L refrigerant (mildly flammable), requires containers and shipping conditions that meet specific Department of Transportation regulations for flammable gases. R-410A, as an A1 refrigerant (non-flammable), was shipped in standard refrigerant cylinders without the additional handling requirements that apply to A2L materials.

• Container supply not scaled for demand: The manufacturing capacity for R-454B-compliant containers — cylinders and disposable canisters that meet DOT requirements for A2L refrigerants — was not scaled to the demand level required when the entire residential HVAC industry transitioned simultaneously. The canister manufacturers had lead times that the refrigerant suppliers and distributors did not fully account for in their transition planning.

• Distribution chain disruption: When canisters were in short supply, distributors and contractors could not stock adequate R-454B inventory — meaning that even when equipment was available, the refrigerant to charge newly installed systems was constrained.

Trane Technologies' Americas group president Donald Simmons disclosed that none of the major HVAC OEMs predicted the canister shortage for R-454B refrigerant that accompanied the January 2025 A2L transition — an unforeseen supply chain constraint that compounded equipment transition disruption and contributed to the severity of residential HVAC market declines exceeding 25% year-over-year in 2025.

Why This Matters for Understanding the Market Now

The canister shortage disclosure matters for understanding the 2026 residential market for a specific reason: it separates the transitory disruption from the structural factors.

The residential market decline in 2025 had multiple causes, which can be divided into structural and transitory:

• Structural (still relevant in 2026): Consumer deferral from elevated equipment prices, the 34 percent hesitancy rate ServiceTitan documented, the 9 million to 7.5 million unit pace reduction that Carrier's Dave Gitlin described, the aging installed base that has not yet reached the urgency threshold for many homeowners.

• Transitory (largely resolved): The A2L equipment transition disruption as contractors learned new systems and manufacturers ramped new product lines, the R-454B canister shortage as container supply caught up with demand, and the one-time ordering pattern disruption as distributors ran down R-410A equipment inventory before the transition deadline.

By early 2026, the canister shortage had largely resolved — supply caught up with demand as container manufacturers scaled capacity and the initial shock of simultaneous nationwide demand was absorbed. Trane's expectation that 'the first half of the year would remain difficult, even as one-time disruptions tied to the refrigerant transition fade' reflects this assessment: the transitory factors are fading, leaving the structural factors as the remaining headwind.

The Stabilisation Signal From Multiple OEMs

The consistent language from multiple OEMs — Lennox citing 'stabilizing end-markets,' Carrier assuming flat residential volumes, Trane expecting gradual improvement — tells a coherent story when the canister shortage is included in the analysis:

The 2025 residential market decline was amplified beyond its structural level by the compounding of equipment transition disruption and canister shortage. As those transitory factors fade, the residential market is stabilising at the 7 to 7.5 million unit annual replacement rate — below historical norms but stable rather than in freefall. The canister shortage story explains why 2025 was worse than the structural factors alone would have produced, and it explains why OEMs are cautiously optimistic about 2026 stabilisation without expecting a rapid recovery.

Frequently Asked Questions

What was the R-454B canister shortage?

The R-454B canister shortage refers to the insufficient supply of DOT-compliant containers for R-454B refrigerant that occurred when the residential HVAC industry transitioned from R-410A to R-454B on January 1, 2025. Container manufacturing capacity was not scaled for simultaneous nationwide demand, disrupting refrigerant supply chains and compounding the equipment transition disruption.

Why did the 2025 HVAC residential market decline so severely?

The 25%+ residential shipment decline in 2025 reflected multiple simultaneous factors: structural consumer deferral from elevated equipment costs, the A2L equipment transition disruption as contractors and distributors adjusted to new products, the canister shortage for R-454B refrigerant, and one-time distributor inventory destocking as R-410A equipment was run down ahead of the transition deadline.

Is the HVAC residential market recovering in 2026?

OEMs including Lennox, Carrier, and Trane are describing the residential market as stabilising in 2026 rather than recovering — settling at a 7 to 7.5 million unit annual replacement rate, below the historical 9 million unit pace. The transitory disruptions from the A2L transition are fading, leaving the structural headwinds of consumer deferral and elevated equipment costs as the primary remaining constraints.