Boise Climate Zone & Energy Code
Climate Zone: IECC Climate Zone 5B (cold-dry). Boise's high desert location produces hot, dry summers (98°F/65°F cooling design, low latent loads) and cold winters (12°F heating design). Both cooling and heating loads drive equipment sizing, with sensible cooling dominant in summer.
Energy Code & Manual J Requirement: Idaho Residential Building Code (IECC 2018). ACCA Manual J required for residential HVAC permits. Ada County and all Treasure Valley jurisdictions enforce state code requirements. Boise's rapid growth means high permit volume and active building department enforcement.
Local Electric Utility: Idaho Power
Building Department: City of Boise Planning & Development Services
Local Trade Association: PHCC Idaho / ASHRAE Idaho Chapter