YES — Oklahoma has adopted 2009 IECC which requires HVAC loads be calculated per ACCA Manual J for new construction and major renovations.
Oklahoma has adopted 2009 IECC as the statewide energy code for residential construction.
Primary zone covering Oklahoma City and surrounding areas
Additional zone in Oklahoma
Local Oklahoma contractors typically charge $150-400 for Manual J calculations. AutoHVAC offers your first Manual J calculation completely FREE with permit-ready results in 60 seconds — no credit card required.
Yes. Oklahoma follows 2009 IECC which requires heating and cooling loads be calculated per ACCA Manual J for permits on new construction and major HVAC work.
You can get a free Manual J calculation for Oklahoma instantly at AutoHVAC — upload your blueprint and receive a permit-ready report in 60 seconds. Alternatively, local Oklahoma HVAC contractors charge $150-400 with 3-7 day turnaround, or you can use DIY software like Wrightsoft or CoolCalc ($5-200+/month).
Oklahoma includes IECC climate zones 3A, 4A. Zone 3A is most common, covering cities like Oklahoma City, Tulsa, Norman. Climate zone data determines design temperatures and insulation requirements used in Manual J calculations.
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