
<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
FINANCIAL STATEMENTS OF AAON, INC., AS OF AND FOR THE YEAR ENDED DECEMBER 31,
1995 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1995
<PERIOD-START>                             JAN-01-1995
<PERIOD-END>                               DEC-31-1995
<CASH>                                             663
<SECURITIES>                                         0
<RECEIVABLES>                                   10,050
<ALLOWANCES>                                       204
<INVENTORY>                                      9,061
<CURRENT-ASSETS>                                21,149
<PP&E>                                          16,143
<DEPRECIATION>                                   5,831
<TOTAL-ASSETS>                                  32,212
<CURRENT-LIABILITIES>                            7,971
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                            24
<OTHER-SE>                                      13,522
<TOTAL-LIABILITY-AND-EQUITY>                    32,212
<SALES>                                         67,346
<TOTAL-REVENUES>                                67,346
<CGS>                                           56,528
<TOTAL-COSTS>                                   62,846
<OTHER-EXPENSES>                                   452
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 815
<INCOME-PRETAX>                                  3,233
<INCOME-TAX>                                     1,164
<INCOME-CONTINUING>                              3,233
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     2,069
<EPS-PRIMARY>                                      .34
<EPS-DILUTED>                                      .34
        

</TABLE>
