IECC 2021 · PNNL
New Hampshire climate zones
New Hampshire’s 10 counties fall in 2 IECC 2021 climate zones: 5A (5), 6A (5).
Zone 5A: cool-humid
Attic target R60 (ENERGY STAR)Cheshire County (Cold) · Hillsborough County (Cold) · Merrimack County (Cold) · Rockingham County (Cold) · Strafford County (Cold)
Zone 6A: cold-humid
Attic target R60 (ENERGY STAR)Belknap County (Cold) · Carroll County (Cold) · Coos County (Cold) · Grafton County (Cold) · Sullivan County (Cold)