St. George Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 3B (hot-dry). St. George's southern Utah desert location produces extreme summer heat (107°F/65°F cooling design) with genuine winters (21°F heating design). One of the fastest-growing cities in the US.

Energy Code & Manual J Requirement: Utah Residential Building Code (IECC 2021). ACCA Manual J required for all Washington County HVAC permit applications.

Local Electric Utility: Rocky Mountain Power (PacifiCorp)

Building Department: City of St. George Building & Zoning Division

Local Trade Association: ACCA Utah