Exhibit 99.1 Lennox Reports Second Quarter Results Q2 Highlights (All comparisons are year-over-year, unless otherwise noted) DALLAS, July 23, 2025 – Lennox (NYSE: LII), a leader in energy-efficient climate-control solutions, today reported second quarter financial results with $1.5 billion of revenue,$354 million of operating income, and $7.82 GAAP diluted earnings per share. Revenue grew 3$1.5 billion. Segment profit increased 11% to $354 million. Segment margin was up 170 basis points to 23.6%. Adj ...