IECC 2021 · PNNL
Nevada climate zones
Nevada’s 17 counties fall in 3 IECC 2021 climate zones: 3B (1), 4B (7), 5B (9).
Zone 3B: warm-dry
Attic target R49 (ENERGY STAR)Clark County (Hot-dry)
Zone 4B: mixed-dry
Attic target R60 (ENERGY STAR)Carson City (Mixed-dry) · Douglas County (Mixed-dry) · Esmeralda County (Mixed-dry) · Lincoln County (Mixed-dry) · Lyon County (Mixed-dry) · Mineral County (Mixed-dry) · Nye County (Mixed-dry)
Zone 5B: cool-dry
Attic target R60 (ENERGY STAR)Churchill County (Cold) · Elko County (Cold) · Eureka County (Cold) · Humboldt County (Cold) · Lander County (Cold) · Pershing County (Cold) · Storey County (Cold) · Washoe County (Cold) · White Pine County (Cold)