YES — District of Columbia has adopted 2021 IECC which requires HVAC loads be calculated per ACCA Manual J for new construction and major renovations.
District of Columbia has adopted 2021 IECC as the statewide energy code for residential construction.
Covers the entire state including Washington DC
Local District of Columbia 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. District of Columbia 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 District of Columbia instantly at AutoHVAC — upload your blueprint and receive a permit-ready report in 60 seconds. Alternatively, local District of Columbia HVAC contractors charge $150-400 with 3-7 day turnaround, or you can use DIY software like Wrightsoft or CoolCalc ($5-200+/month).
District of Columbia includes IECC climate zone 4A. This zone covers the entire state including Washington DC. Climate zone data determines design temperatures and insulation requirements used in Manual J calculations.
Join thousands of District of Columbia contractors who use AutoHVAC for instant, permit-ready load calculations.
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