Exhibit 99.1 Lennox Reports First Quarter Results Q1 Highlights (All comparisons are year-over-year, unless otherwise noted) DALLAS, April 23, 2025 – Lennox (NYSE: LII), a leader in energy-efficient climate-control solutions, today reported first quarter financial results with $1.1 billion of revenue,$156 million of operating income and $3.37 GAAP diluted earnings per share. Revenue grew 2$1.1 billion. Segment profit decreased 7% to $156 million. Segment margin was down 140 basis points to 14.5%. Adju ...