LII: Leadership change

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. On September 16, 2026, the Compensation and Human Resources Committee (the “Committee”) of the Board of Directors of Lennox International Inc. (the “Company”) approved a new form of Long-Term Incentive Award Agreement for U.S. Employees - Vice President and Above for use under the 2019 Equity and Incentive Compensation Plan (the “Award Agreement”). The Award Agreement will be used for grants to executive officers of restricted stock units, performance share units, and stock appreciation rights. The terms of the Award Agreement are substantially similar to those in the form of award agreement previously disclosed by the Company, except for updates to the vesting and exercise schedules and retirement eligibility, as well as other administrative and conforming changes. The foregoing description of the Award Agreement is qualified in its entirety by reference to the Award Agreement, which is attached as Exhibit 10.1 to this Current Report on Form 8-K and incorporated by reference herein. Item 9.01 Financial Statements and Exhibits. (d) Exhibits. EXHIBIT NUMBER DESCRIPTION 10.1 Form of Long-Term Incentive Award Agreement for U.S. Employees - Vice President and Above (for use under the 2019 Incentive Plan) (Sept 2026 version) (filed herewith). 104 Inline XBRL for the cover page of this Current Report on Form 8-K SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. LENNOX INTERNATIONAL INC. Date: September 18, 2026 By: /s/ Jennifer S. Perry Name: Jennifer S. Perry Title: Assistant Se