Mesa Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 2B (hot-dry). Mesa's Phoenix metro east valley position produces extreme desert heat — 110°F cooling design and 31°F heating design. Dry air means latent loads are minimal; sensible cooling loads are extreme and equipment must maintain rated capacity at actual outdoor conditions.

Energy Code & Manual J Requirement: Arizona Residential Energy Code (IECC 2018). ACCA Manual J required for residential HVAC permits in Maricopa County and Mesa jurisdictions.

Local Electric Utility: Salt River Project (SRP)

Building Department: City of Mesa Building Division

Local Trade Association: ACCA Arizona Chapter / ASHRAE Arizona Chapter