Lakewood Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 5B (cold semi-arid). Lakewood at 5,520' elevation shares Denver's general climate — -1°F heating design and 93°F cooling design — with slightly cooler conditions due to foothill proximity. Low humidity dominates both summer and winter.

Energy Code & Manual J Requirement: Colorado IECC 2021. ACCA Manual J required for residential HVAC permits in Jefferson County and Lakewood city jurisdictions.

Local Electric Utility: Xcel Energy

Building Department: City of Lakewood Building Permits Division

Local Trade Association: ACCA Rocky Mountain Chapter