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Warranties
 9 Months Ended
Sep. 30, 2025
Guarantees [Abstract]  
Warranties Warranties
The Company has product warranties with various terms from one year from the date of first use or 18 months for parts, data center cooling solutions, and cleanroom systems to 25 years for certain heat exchangers. The Company has an obligation to replace parts if conditions under the warranty are met. A provision is made for estimated warranty costs at the time the related products are sold based upon the warranty period, historical trends, new products, and any known identifiable warranty issues.  
Changes in the warranty accrual are as follows:
 Three Months EndedNine Months Ended
 September 30,
2025		September 30,
2024		September 30,
2025		September 30,
2024
Warranty accrual:(in thousands)
Balance, beginning of period$23,762 $21,632 $24,341 $20,573 
Payments made(5,127)(3,672)(12,516)(9,331)
Warranty expense8,905 4,670 15,715 11,388 
Balance, end of period$27,540 $22,630 $27,540 $22,630 

Warranty expense (benefit) by reportable segment (Note 21) is as follows:
 Three Months EndedNine Months Ended
 September 30,
2025		September 30,
2024		September 30,
2025		September 30,
2024
(in thousands)
AAON Oklahoma$6,224 $3,336 $11,101 $9,332 
AAON Coil Products2,144 803 3,004 1,323 
BASX537 531 1,610 733 
Total$8,905 $4,670 $15,715 $11,388