YES — New Hampshire has adopted 2018 IECC which requires HVAC loads be calculated per ACCA Manual J for new construction and major renovations.
New Hampshire has adopted 2018 IECC as the statewide energy code for residential construction.
Primary zone covering Manchester and surrounding areas
Additional zone in New Hampshire
Local New Hampshire 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. New Hampshire follows 2018 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 New Hampshire instantly at AutoHVAC — upload your blueprint and receive a permit-ready report in 60 seconds. Alternatively, local New Hampshire HVAC contractors charge $150-400 with 3-7 day turnaround, or you can use DIY software like Wrightsoft or CoolCalc ($5-200+/month).
New Hampshire includes IECC climate zones 5A, 6A. Zone 5A is most common, covering cities like Manchester, Nashua, Concord. Climate zone data determines design temperatures and insulation requirements used in Manual J calculations.
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