AAON (AAON) 10-K 2016 FY Annual report

Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We have issued our reports dated February 23, 2017, with respect to the consolidated financial statements and internal control over financial reporting in the Annual Report of AAON, Inc. on Form 10-K for the year ended December 31, 2016. We consent to the incorporation by reference of said reports in the Registration Statements of AAON, Inc. on Forms S-8 (File No. 333-52824, File No. 333-151915, File No. 333-207737, and File No. 333-212863).

/s/ GRANT THORNTON LLP

Tulsa, Oklahoma

February 23, 2017