Nampa Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 5B (cold-dry). Nampa's Treasure Valley location produces hot, dry summers (99°F/65°F) and cold winters (11°F). Very low summer humidity keeps latent loads minimal while sensible cooling and heating both drive equipment sizing.

Energy Code & Manual J Requirement: Idaho Residential Building Code (IECC 2018). ACCA Manual J required for Canyon County HVAC permits.

Local Electric Utility: Idaho Power

Building Department: City of Nampa Building Department

Local Trade Association: PHCC Idaho