v3.26.1
Warranties
 6 Months Ended
Jun. 30, 2026
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 Ended June 30,Six Months Ended June 30,
2026202520262025
Warranty accrual:(in thousands)
Balance, beginning of period$31,447 $23,610 $29,965 $24,341 
Payments made(5,803)(3,447)(10,234)(7,389)
Warranty expense10,987 3,599 16,900 6,810 
Balance, end of period$36,631 $23,762 $36,631 $23,762 

Warranty expense by reportable segment (Note 21) is as follows:
Three Months Ended June 30,Six Months Ended June 30,
2026202520262025
(in thousands)
AAON Oklahoma$6,067 $2,710 $10,539 $4,877 
AAON Coil Products3,327 461 4,541 860 
BASX1,593 428 1,820 1,073 
Total$10,987 $3,599 $16,900 $6,810