Honolulu Climate Zone & Energy Code
Climate Zone: IECC Climate Zone 1A (hot-humid tropical). Honolulu's tropical climate means year-round cooling with no meaningful heating load. Trade winds and micro-climate variation across Oahu's windward/leeward divide significantly affect cooling loads by location.
Energy Code & Manual J Requirement: Hawaii Energy Code (IECC 2018 with Hawaii amendments). ACCA Manual J required for residential HVAC sizing. City and County of Honolulu Department of Planning and Permitting administers permits. Hawaii has specific solar water heating and photovoltaic requirements that interact with HVAC system design.
Local Electric Utility: Hawaiian Electric (HECO)
Building Department: City & County of Honolulu Department of Planning & Permitting (DPP)
Local Trade Association: ASHRAE Hawaii Chapter / Hawaii ACCA-affiliated contractors