YES — Texas has adopted 2021 IECC which requires HVAC loads be calculated per ACCA Manual J for new construction and major renovations.
Texas has adopted 2021 IECC as the statewide energy code for residential construction.
Primary zone covering Houston and surrounding areas
Additional zone in Texas
Additional zone in Texas
Additional zone in Texas
Additional zone in Texas
Additional zone in Texas
Local Texas 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. Texas follows 2021 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 Texas instantly at AutoHVAC — upload your blueprint and receive a permit-ready report in 60 seconds. Alternatively, local Texas HVAC contractors charge $150-400 with 3-7 day turnaround, or you can use DIY software like Wrightsoft or CoolCalc ($5-200+/month).
Texas includes IECC climate zones 2A, 2B, 3A, 3B, 4A, 4B. Zone 2A is most common, covering cities like Houston, San Antonio, Dallas. Climate zone data determines design temperatures and insulation requirements used in Manual J calculations.
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