RESIDEO TECHNOLOGIES INC

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Stockholders and the Board of Directors of Resideo Technologies, Inc.

Opinion on Internal Control over Financial Reporting

We have audited the internal control over financial reporting of Resideo Technologies, Inc. (the “Company”) as of December 31, 2024, based on criteria established in Internal Control — Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control — Integrated Framework (2013) issued by COSO.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated financial statements as of and for the year ended December 31, 2024, of the Company and our report dated February 20, 2025, expressed an unqualified opinion on those financial statements.

As described in Management’s Annual Report on Internal Control over Financial Reporting, management excluded from its assessment the internal control over financial reporting at Snap One, which was acquired on June 14, 2024, and whose financial statements constitute 8.2% and 19.0% of total assets and revenues, respectively, of the consolidated financial statement amounts as of and for the year ended December 31, 2024. Accordingly, our audit did not include the internal control over financial reporting at Snap One.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management's Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/Deloitte & Touche LLP

Minneapolis, Minnesota

February 20, 2025

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Stockholders and the Board of Directors of Resideo Technologies, Inc

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Resideo Technologies, Inc (the "Company") as of December 31, 2024 and 2023, the related consolidated statements of operations, comprehensive income, cash flows, and stockholders’ equity, for each of the three years in the period ended December 31, 2024, and the related notes (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024, in conformity with accounting principles generally accepted in the United States of America.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control — Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 20, 2025, expressed an unqualified opinion on the Company's internal control over financial reporting.

Basis for Opinion

These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matters

The critical audit matters communicated below are matters arising from the current-period audit of the financial statements that were communicated or required to be communicated to the audit committee and that (1) relate to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the financial statements, taken as a whole, and we are not, by communicating the critical audit matters below, providing separate opinions on the critical audit matters or on the accounts or disclosures to which they relate.

Honeywell Reimbursement Agreement — Refer to Note 16. Commitments and Contingencies to the financial statements

Critical Audit Matter Description

Pursuant to the Honeywell Reimbursement Agreement (the “Reimbursement Agreement”), the Company has an obligation to make cash payments to Honeywell with respect to certain environmental claims associated with specified properties contaminated through historical business operations. The Company’s obligation is equal to 90% of payments for certain Honeywell environmental liability payments, less 90% of Honeywell’s net insurance receipts, plus certain other recoveries relating to such liabilities, as defined by the Reimbursement Agreement. The amount payable by the Company under this agreement is subject to an annual limit of $140 million.

The Company records its obligation under the Reimbursement Agreement based on the underlying environmental remediation liabilities of specified Honeywell sites which are recorded when a remediation liability is determined to be probable, and the related costs can be reasonably estimated. The determination of the amount of future costs associated with environmental remediation requires judgments and estimates by management. Furthermore, information the Company uses to evaluate the estimates is obtained from Honeywell under the terms of the Reimbursement Agreement.

Given the subjectivity in estimating the remediation costs for environmental matters and judgments made by management related to those estimates, performing audit procedures to evaluate the reasonableness of management’s estimates and assumptions requires a high degree of auditor judgment.

How the Critical Audit Matter Was Addressed in the Audit

Our audit procedures related to the Company’s obligation under the Reimbursement Agreement and evaluation of the Company’s evidence supporting its estimates included the following, among others:

•We tested the effectiveness of controls related to remediation costs for environmental matters, including management’s controls over the recording of and changes to the liability for the Company’s obligations under the Reimbursement Agreement.

•We read the Reimbursement Agreement and evaluated the Company’s compliance with it to the extent it has the potential to affect the Company’s related liability.

•We performed searches of third-party sources to identify potential liabilities related to the specified sites that may not have been included in the estimates.

•We tested the completeness and accuracy of the recognition of the Company’s liability for obligations under the Reimbursement Agreement through the following procedures:

◦For a selection of incremental charges to the Honeywell Environmental liability (increases), obtained supporting documentation related to the valuation of the liability from management, including, but not limited to, regulatory records of decision, feasibility studies, and third-party engineering estimates.

◦For a selection of payments related to the Honeywell Environmental liability (decreases), obtained supporting documentation related to the original invoice and proof of payment.

◦Made inquiries of internal and external legal counsel regarding environmental matters.

◦Performed searches of public domain sources to identify new remediation sites attributable to the Company or any additional remediation activities required by federal, state, or international authorities that may not have been included in the estimates.

Acquisitions – Snap One – Customer Relationship Intangible Asset - Refer to Note 2 and Note 3 to the Financial Statements

Critical Audit Matter Description

The Company completed the acquisition of Snap One Holdings Corp. (“Snap One”) for $1.4 billion on June 14, 2024. The Company accounted for the acquisition under the acquisition method of accounting for business combinations. Accordingly, the purchase price was allocated to the assets acquired and liabilities assumed based on their respective fair values, including a customer relationship intangible asset of $590 million. Management estimated the fair value of the customer relationship asset using the multi-period excess earnings method, which is a specific discounted cash flow method. The fair value determination of the intangible asset required management to make significant estimates and assumptions related to the attrition rate, the determination of future cash flows including revenue growth rate, cost of sales, and total operating expenses and the selection of the discount rate.

We identified the fair value determination of customer relationship intangible asset of Snap One as a critical audit matter because of the significant estimates and assumptions management made to determine the fair value of this asset. This required a high degree of auditor judgment and an increased extent of effort, including the need to involve our fair value specialists, when performing audit procedures to evaluate the reasonableness of this asset. Specific assumptions that required a high degree of judgment included the attrition rate, the determination of future cash flows including revenue growth rate, cost of sales, and total operating expenses and the selection of the discount rate.

How the Critical Audit Matter Was Addressed in the Audit

Our audit procedures related to the determination of the attrition rate, revenue growth rate, cost of sales, and total operating expenses and the selection of discount rate included the following, among others:

•We tested the effectiveness of controls over the valuation of the customer relationship, including management’s controls over the attrition rate and the determination of future cash flows including revenue growth rate, cost of sales, and operating expenses and the selection of the discount rate.

•With the assistance of our fair value specialists, we evaluated the reasonableness of the valuation methodologies, attrition rate and discount rate by;

◦Testing the source information underlying the determination of the attrition rate and discount rate and testing the mathematical accuracy of the calculations.

▪Obtaining an understanding of the methodology used in determining the fair value of customer relationship and determining whether the methodology is acceptable in accordance with applicable accounting and valuation standards.

▪Developing a range of independent estimates and comparing those to the discount rate selected by management.

◦We tested management’s forecast of revenue growth rate, cost of sales, and total operating expenses, relating to the valuation of the customer relationship intangible asset, by;

▪Obtaining an understanding of management’s estimate analysis.

▪Evaluating whether the significant assumptions are consistent with the following, when applicable: relevant industry, regulatory, and other external factors, including economic conditions; the Company's objectives, strategies, and related business risks; historical or recent experience, taking into account changes in conditions and events affecting the Company;

▪Evaluate whether the data is relevant and reliable for internally derived and/or external data, including whether the data is accurate and complete when internally derived.

◦We evaluated whether the estimated future cash flows were consistent with evidence obtained in other areas of the audit.

◦Tested the mathematical accuracy of the computations and application of the valuation model in calculating the fair value of the customer relationship intangible assets.

/s/ Deloitte & Touche LLP

Minneapolis, Minnesota

February 20, 2025

We have served as the Company's auditor since 2018.