Hilo Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 1A (hot-humid tropical). Hilo's windward location on Mauna Kea's flank produces extremely high rainfall and persistent humidity — the highest latent cooling loads in Hawaii — with moderate sensible temperatures compared to Hawaii's leeward locations.

Energy Code & Manual J Requirement: Hawaii Energy Code (IECC 2018 with Hawaii amendments). ACCA Manual J required for residential HVAC sizing. Hawaii County Department of Public Works administers Big Island permits.

Local Electric Utility: Hawaii Electric Light Company (HELCO / Hawaiian Electric)

Building Department: Hawaii County Department of Public Works Building Division

Local Trade Association: ASHRAE Hawaii Chapter