Exhibit 4.1

Execution Version

EIGHTH SUPPLEMENTAL INDENTURE

Eighth Supplemental Indenture (this “Supplemental Indenture”), dated as of June 24, 2026, among Resideo Funding Inc., a Delaware corporation (the “Initial Issuer”), Resideo Funding II LLC, a Delaware limited liability company (the “Assumption Issuer”) and U.S. Bank Trust Company, National Association, as trustee (the “Trustee”).

W I T N E S S E T H :

WHEREAS, each of the Initial Issuer and the Guarantors (as defined in the Indenture referred to below) has heretofore executed and delivered to the Trustee an indenture dated as of August 26, 2021 (as amended, supplemented or otherwise modified from time to time, the “Indenture”), providing for the issuance of an unlimited aggregate principal amount of 4.000% Senior Notes due 2029 (the “Notes”);

WHEREAS, pursuant to Section 5.01 of the Indenture, the Initial Issuer proposes to merge with and into the Assumption Issuer, with the Assumption Issuer as the surviving entity (the “Merger”) and, pursuant to this Supplemental Indenture, assume all of the rights and obligations of the Issuer under the Notes and the Indenture (the “Assumption”);

WHEREAS, pursuant to Section 9.01(a)(3) of the Indenture, the Trustee is authorized to execute and deliver this Supplemental Indenture without the consent of the Holders of the Notes.

NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the parties mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows:

1. Capitalized Terms. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture.

2. Agreement to be Bound. The Assumption Issuer acknowledges that it has received and reviewed a copy of the Indenture and all other documents it deems necessary to review in order to enter into this Supplemental Indenture, and acknowledges and agrees to (i) unconditionally assume all of the Initial Issuer’s obligations under the Notes and the Indenture on the terms and subject to the conditions set forth in the Indenture; (ii) be bound by all applicable provisions of the Indenture as if made by, and with respect to the Assumption Issuer; and (iii) perform all obligations and duties required of the Initial Issuer pursuant to the Indenture. From and after the date hereof, all references in the Indenture to the “Issuer” shall refer to the Assumption Issuer instead of the Initial Issuer.

3. Notices. All notices or other communications to the Assumption Issuer shall be given as provided in Section 12.02 of the Indenture.

4. Execution and Delivery. The Assumption Issuer agrees that the Notes shall remain in full force and effect notwithstanding the absence of any endorsement of the Assumption Issuer on the Notes.

5. Release of Obligations. Pursuant to Section 5.02, upon the consummation of the Merger, the Initial Issuer shall be unconditionally and irrevocably released and discharged from all obligations and liabilities under the Indenture and the Notes.

6. Governing Law. THIS SUPPLEMENTAL INDENTURE WILL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

7. Waiver of Jury Trial. EACH OF THE INITIAL ISSUER, THE ASSUMPTION ISSUER AND THE TRUSTEE HEREBY IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS SUPPLEMENTAL INDENTURE, THE INDENTURE, THE NOTES, THE NOTE GUARANTEES OR THE TRANSACTIONS CONTEMPLATED HEREBY OR THEREBY.

8. Trustee Makes No Representation. The recitals contained herein shall be taken as the statements of the Initial Issuer or the Assumption Issuer, and the Trustee assumes no responsibility for their correctness. The Trustee makes no representation as to the validity or sufficiency of this Supplemental Indenture.

9. Counterparts; Electronic Delivery. The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement. The exchange of copies of this Supplemental Indenture and of signature pages by facsimile or portable document format (“PDF”) transmission shall constitute effective execution and delivery of this Supplemental Indenture as to the parties hereto and may be used in lieu of the original Supplemental Indenture for all purposes. Signatures of the parties hereto transmitted by facsimile or PDF shall be deemed to be their original signatures for all purposes. The words “execution,” “signed,” “signature,” “delivery” and words of like import in or relating to this Supplemental Indenture or any document to be signed in connection with this Supplemental Indenture shall be deemed to include electronic signatures, deliveries or the keeping of records in electronic form, each of which shall be of the same legal effect, validity or enforceability as a manually executed signature, physical delivery thereof or the use of a paper-based recordkeeping system, as the case may be, and the parties hereto consent to conduct the transactions contemplated hereunder by electronic means.

10. Effect of Headings. The headings of the Sections of this Supplemental Indenture have been inserted for convenience of reference only, are not to be considered a part of this Supplemental Indenture and shall in no way modify or restrict any of the terms or provisions hereof.

[Signature Pages Follow]

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed as of the date first above written.

[Signature Page to Eighth Supplemental Indenture]

Exhibit 4.2

Execution Version

THIRD SUPPLEMENTAL INDENTURE

Third Supplemental Indenture (this “Supplemental Indenture”), dated as of June 24, 2026, among Resideo Funding Inc., a Delaware corporation (the “Initial Issuer”), Resideo Funding II LLC, a Delaware limited liability company (the “Assumption Issuer”) and U.S. Bank Trust Company, National Association, as trustee (the “Trustee”).

W I T N E S S E T H :

WHEREAS, each of the Initial Issuer and the Guarantors (as defined in the Indenture referred to below) has heretofore executed and delivered to the Trustee an indenture dated as of July 17, 2024 (as amended, supplemented or otherwise modified from time to time, the “Indenture”), providing for the issuance of an unlimited aggregate principal amount of 6.500% Senior Notes due 2032 (the “Notes”);

WHEREAS, pursuant to Section 5.01 of the Indenture, the Initial Issuer proposes to merge with and into the Assumption Issuer, with the Assumption Issuer as the surviving entity (the “Merger”) and, pursuant to this Supplemental Indenture, assume all of the rights and obligations of the Issuer under the Notes and the Indenture (the “Assumption”);

WHEREAS, pursuant to Section 9.01(a)(3) of the Indenture, the Trustee is authorized to execute and deliver this Supplemental Indenture without the consent of the Holders of the Notes.

NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the parties mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows:

1. Capitalized Terms. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture.

2. Agreement to be Bound. The Assumption Issuer acknowledges that it has received and reviewed a copy of the Indenture and all other documents it deems necessary to review in order to enter into this Supplemental Indenture, and acknowledges and agrees to (i) unconditionally assume all of the Initial Issuer’s obligations under the Notes and the Indenture on the terms and subject to the conditions set forth in the Indenture; (ii) be bound by all applicable provisions of the Indenture as if made by, and with respect to the Assumption Issuer; and (iii) perform all obligations and duties required of the Initial Issuer pursuant to the Indenture. From and after the date hereof, all references in the Indenture to the “Issuer” shall refer to the Assumption Issuer instead of the Initial Issuer.

3. Notices. All notices or other communications to the Assumption Issuer shall be given as provided in Section 12.02 of the Indenture.

4. Execution and Delivery. The Assumption Issuer agrees that the Notes shall remain in full force and effect notwithstanding the absence of any endorsement of the Assumption Issuer on the Notes.

5. Release of Obligations. Pursuant to Section 5.02, upon the consummation of the Merger, the Initial Issuer shall be unconditionally and irrevocably released and discharged from all obligations and liabilities under the Indenture and the Notes.

6. Governing Law. THIS SUPPLEMENTAL INDENTURE WILL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

7. Waiver of Jury Trial. EACH OF THE INITIAL ISSUER, THE ASSUMPTION ISSUER AND THE TRUSTEE HEREBY IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS SUPPLEMENTAL INDENTURE, THE INDENTURE, THE NOTES, THE NOTE GUARANTEES OR THE TRANSACTIONS CONTEMPLATED HEREBY OR THEREBY.

8. Trustee Makes No Representation. The recitals contained herein shall be taken as the statements of the Initial Issuer or the Assumption Issuer, and the Trustee assumes no responsibility for their correctness. The Trustee makes no representation as to the validity or sufficiency of this Supplemental Indenture.

9. Counterparts; Electronic Delivery. The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement. The exchange of copies of this Supplemental Indenture and of signature pages by facsimile or portable document format (“PDF”) transmission shall constitute effective execution and delivery of this Supplemental Indenture as to the parties hereto and may be used in lieu of the original Supplemental Indenture for all purposes. Signatures of the parties hereto transmitted by facsimile or PDF shall be deemed to be their original signatures for all purposes. The words “execution,” “signed,” “signature,” “delivery” and words of like import in or relating to this Supplemental Indenture or any document to be signed in connection with this Supplemental Indenture shall be deemed to include electronic signatures, deliveries or the keeping of records in electronic form, each of which shall be of the same legal effect, validity or enforceability as a manually executed signature, physical delivery thereof or the use of a paper-based recordkeeping system, as the case may be, and the parties hereto consent to conduct the transactions contemplated hereunder by electronic means.

10. Effect of Headings. The headings of the Sections of this Supplemental Indenture have been inserted for convenience of reference only, are not to be considered a part of this Supplemental Indenture and shall in no way modify or restrict any of the terms or provisions hereof.

[Signature Pages Follow]

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed as of the date first above written.

[Signature Page to Third Supplemental Indenture]

Exhibit 10.1

Execution Version

JOINDER TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT AND BORROWER ASSUMPTION

June 24, 2026

This Joinder to Second Amended and Restated Credit Agreement and Borrower Assumption (this “Agreement”), dated as of the date hereof, is made by Resideo Funding II LLC (the “New Borrower”) and Resideo Funding Inc. (the “Existing Borrower”) to and in favor of JPMorgan Chase Bank, N.A., as administrative agent (in such capacity, the “Administrative Agent”) for the Lenders under the Second Amended and Restated Credit Agreement referred to below.

Reference is made to the Second Amended and Restated Credit Agreement, dated as of June 4, 2026 (as amended, restated, amended and restated, supplemented or otherwise modified from time to time, the “Credit Agreement”), by and among Resideo Technologies, Inc., Resideo Holding Inc., Resideo Intermediate Holding Inc., the Existing Borrower, the other companies party thereto, the financial institutions party thereto as lenders and issuing banks and the Administrative Agent. Capitalized terms used herein but not otherwise defined herein shall have the respective meanings ascribed to such terms in the Credit Agreement.

The New Borrower hereby acknowledges, agrees and elects to be a “Loan Party” for all purposes of and under the Credit Agreement and each of the other Loan Documents executed and delivered in connection therewith, effective from the date hereof. All references in the Credit Agreement and the other Loan Documents to the terms “Loan Party” or “Loan Parties” shall be deemed to include the New Borrower. By its execution of this Agreement, solely with respect to itself, the New Borrower hereby confirms that, as of the effective date of this Agreement, the representations and warranties contained in Article III of the Credit Agreement or any other Loan Document are true and correct in all respects (or, if any such representation or warranty is by its terms qualified by concepts of materiality, such representation or warranty is true and correct in all respects) with the same effect as if made on and as of the date hereof (or, to the extent stated to relate to a specific earlier date, on and as of such earlier date). Without limiting the generality of the foregoing, the New Borrower hereby agrees to perform all the obligations of a Loan Party under, and to be bound in all respects by the terms of, the Credit Agreement to the same extent and with the same force and effect as if it were a signatory party thereto as a Loan Party.

The parties hereby agree that immediately upon the Co-Borrower Merger, the New Borrower (i) shall become a party to the Credit Agreement as “Borrower” and a “Loan Party” under the Credit Agreement and the other Loan Documents with the same force and effect as if originally party thereto as Borrower and a Loan Party and, without limiting the generality of the foregoing, hereby expressly assumes all obligations and liabilities of Borrower and a Loan Party under the Credit Agreement, the Notes, if any, and under each other Loan Document, (ii) shall have all of the obligations and rights of Borrower and a Loan Party under the Credit Agreement, the Notes, if any, and the other Loan Documents, and (iii) shall be bound by all of the terms and provisions of the Credit Agreement.

As of the date hereof, Exhibits A, H, I, J-1, J-2, J-3, J-4, K, L and M to the Credit Agreement are hereby deleted and replaced with those Exhibits to the Credit Agreement attached as Annex I hereto.

Except as specifically modified hereby, all of the terms and conditions of the Credit Agreement and other Loan Documents shall remain unchanged and in full force and effect.

No reference to this Agreement need be made in the Credit Agreement or in any other Loan Document or other document or instrument making reference to the same, any reference to Loan Documents in any of such to be deemed a reference to the Credit Agreement, or other Loan Documents, as applicable, as modified hereby.

Each of the undersigned acknowledges that this Agreement shall be effective upon execution by the New Borrower, the Existing Borrower and the Administrative Agent. THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

This Agreement may be executed in counterparts (and by different parties hereto on different counterparts), each of which shall constitute an original, but all of which when taken together shall constitute a single contract. This Agreement constitutes the entire contract among the parties relating to the subject matter hereof and supersede any and all previous agreements and understandings, oral or written, relating to the subject matter hereof. Delivery of an executed counterpart of a signature page of this Agreement that is an electronic signature transmitted by telecopy, emailed pdf or any other electronic means that reproduces an image of an actual executed signature page shall be effective as delivery of a manually executed counterpart of this Agreement.

[Remainder of Page Intentionally Left Blank; Signature Page to Follow]

[Signature page to Joinder to Second Amended and Restated Credit Agreement and Borrower Assumption]

[Joinder to Second Amended and Restated Credit Agreement and Borrower Assumption]

Annex I

Amended and Restated Exhibits to Credit Agreement

[Joinder to Second Amended and Restated Credit Agreement and Borrower Assumption]