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Exhibit 99.1 AAON® AAON REPORTS RECORD SALES FOR THE SECOND QUARTER OF 2021 AND A ROBUST INCREASE IN BACKLOG TULSA , OK , August 5 , 2021 - AAON , INC . ( NASDAQ - AAON ) , today announced its results for the second quarter of 2021 . Financial Highlights : Three Months Ended Six Months Ended June 30 , June 30 , Net sales Gross profit Gross profit % Selling , general and admin . expenses SG & A % Net income Net income % Effective Tax Rate Earnings per diluted share Diluted average shares EBITDA , a non - GAAP measure Backlog Cash & cash equivalents & restricted cash % 2021 2020 Change ( in thousands , except share and per share data ) $ 143,876 $ 125,596 14.6 % 42,107 38,131 $ $ $ $ 29.3 % 16,895 11.7 % 20,615 14.3 % 18.3 % 0.38 53,603,932 32,777 June 30 , 2021 138,131 $ 112,119 $ 30.4 % ( in thousands ) 15,939 12.7 % 17,804 14.2 % 20.0 % 0.34 52,750,401 $ 28,562 June 30 , 2020 $ 103,508 70,845 10.4 % 6.0 % 1 15.8 % 11.8 % 1.6 % 14.8 % % Change 33.4 % 58.3 % $ $ $ $ % 2020 Change ( in thousands , except share and per share data ) 263,079 259,664 $ 75,264 81,078 2021 29.0 % 31,591 12.2 % 36,991 14.2 % 15.4 % 0.69 53,736,134 58,653 $ $ 30.8 % 31,153 11.8 % 39,657 15.1 % 20.8 % 0.75 52,885,491 $ 62,332 ( 1.3 ) % ( 7.2 ) % 1.4 % ( 6.7 ) % ( 8.0 ) % 1.6 % ( 5.9 ) % Net sales for the three months ended June 30 , 2021 increased 14.6 % to an all time record high of $ 143.9 million from $ 125.6 million in the same period in 2020. The year over year increase in net sales was driven by robust replacement demand broadly across the nonresidential building market that increased our volume 24.6 % . The return to historical employee attendance levels helped drive our production up year over year which led to an increase in our overall revenues even as our product mix shifted to lower priced units . The Company reported diluted EPS of $ 0.38 , up 11.8 % from $ 0.34 in the prior year period . The increase in EPS was driven by the higher revenue , improved productivity , lower SG & A expenses as a percent of sales and a lower tax rate , partially offset by inflationary cost pressures . The lower tax rate compared to a year ago was associated with lower corporate income tax rates in the state of Oklahoma that were signed into law during the quarter . This resulted in a one - time benefit of $ 0.8 million , and will also lower our effective rate starting in 2022 . The Company finished the quarter with a backlog of $ 138.1 million , up from $ 103.5 million one year ago and up from $ 96.7 million at the end of the first quarter of 2021. The sequential improvement in backlog reflects the improved demand that we experienced throughout the second quarter . New bookings in the quarter increased approximately 70 % compared to the same period one year ago .