Lennox International (NYSE: LII) reported first quarter 2026 financial results on April 29, 2026, with $1.1 billion in total revenue — up 6 percent year-over-year — and $3.35 GAAP diluted earnings per share. CEO Alok Maskara described the results as supported by 'stabilizing end-markets and encouraging momentum across our strategic initiatives, including the integration of Duro Dyne and Supco.'

The Q1 performance reveals a business navigating the same residential-commercial divergence that is defining the HVAC industry in 2026: residential volumes under pressure from consumer deferral and elevated equipment costs, while commercial activity benefits from data centre and building renovation demand. Lennox's commercial segment was the standout performer, while residential volumes remained challenged in a market that the company acknowledges is still working through the impacts of the A2L refrigerant transition.

The Numbers That Matter

Breaking down the Q1 2026 results:

• Revenue: $1.1 billion, up 6% year-over-year. The increase was driven by revenue from completed acquisitions (Duro Dyne and Supco) and pricing, partially offset by lower sales volumes in the residential market.

• GAAP Operating Income: $164 million, down 3% from Q1 2025. The margin decline reflects the challenging residential volume environment combined with integration costs from the Duro Dyne and Supco acquisition.

• Commercial segment: Segment profit up $37 million or 63%, with segment margin improving 300 basis points to 19.7%. This is the standout number — commercial HVAC is significantly outperforming residential for Lennox, as for every other major OEM.

• Full-year guidance: Maintained at $23.50 to $25.00 in adjusted diluted EPS — unchanged from prior guidance, signalling confidence in the full-year outlook despite the residential volume headwind.

• Duro Dyne integration: The acquisition completed October 2025 contributed to revenue growth in Q1. CEO Maskara specifically called out 'encouraging momentum' in the integration — the parts and supplies business is beginning to contribute to the lifecycle solutions strategy.

Lennox International reported Q1 2026 revenue of $1.1 billion, up 6%, with commercial segment profit up 63% and margin expanding 300 basis points to 19.7% — reflecting the residential-commercial divergence that characterises the 2026 HVAC market, as data centre and building renovation demand offsets residential volume softness from consumer deferral.

The Residential Challenge: A2L Canister Shortage

The most specific and interesting disclosure in Lennox's recent commentary concerns the A2L refrigerant transition disruption. Trane's Donald Simmons — group president of Americas — put it directly in an ACHR News interview: 'None of us predicted that with the refrigerant change, there would have been a canister shortage.'

The canister shortage refers to the containers used to ship R-454B refrigerant — a component that manufacturers, distributors, and contractors all underestimated when planning for the transition from R-410A. When the transition happened on January 1, 2025, demand for R-454B canisters significantly exceeded the available supply, creating a secondary supply chain constraint that compounded the primary equipment transition disruption.

This canister shortage explanation adds a specific, verifiable, non-conspiracy reason for the disruption that accompanied the A2L transition — and it provides important context for understanding why residential HVAC shipments were so severely affected in 2025, falling more than 25 percent year-over-year at points and approaching 50 percent at the worst moments.

The Commercial Bright Spot — 19.7% Segment Margin

Lennox's commercial segment margin of 19.7% in Q1 2026 — up 300 basis points year-over-year — is a significant accomplishment. Commercial HVAC has historically generated lower margins than residential for most OEMs because of the customised, engineered-to-order nature of commercial equipment and the more competitive bidding process. A 300 basis point margin improvement in a single year suggests that the Duro Dyne and Supco acquisition is beginning to demonstrate the lifecycle solutions premium that Lennox was targeting — higher-margin parts and accessories business adding to the commercial revenue mix.

Lennox is maintaining its full-year EPS guidance of $23.50 to $25.00 — a range that implies confidence that the commercial segment strength will continue to offset residential headwinds through the remaining quarters of 2026. The stabilisation language in Maskara's commentary suggests Lennox expects residential to bottom and begin a gradual recovery, but without the sharp rebound that would be required to drive significant full-year outperformance.

Frequently Asked Questions

What were Lennox's Q1 2026 results?

Lennox reported Q1 2026 revenue of $1.1 billion, up 6% year-over-year. GAAP operating income was $164 million, down 3%. Commercial segment profit rose 63% with margin expanding 300 basis points to 19.7%. GAAP diluted EPS was $3.35. Full-year 2026 EPS guidance of $23.50 to $25.00 was maintained unchanged.

How is Lennox's Duro Dyne and Supco integration going?

CEO Alok Maskara described 'encouraging momentum' in the Duro Dyne and Supco integration as of Q1 2026. The acquisition, completed October 2025 for $550 million, contributed to revenue growth in the quarter and is beginning to demonstrate the lifecycle solutions strategy — adding parts and accessories revenue to Lennox's equipment sales base.

Why is Lennox's residential business under pressure?

Lennox's residential volume is under pressure from consumer deferral of HVAC replacement driven by elevated equipment costs and economic uncertainty. The company also cited lingering disruption from the January 2025 A2L refrigerant transition — including an unexpected canister shortage for R-454B refrigerant that compounded the transition disruption and contributed to the severe residential shipment declines experienced through 2025.