Jackson Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 3A (mixed-humid). Jackson's west Tennessee position is in Climate Zone 3A — the same zone as Memphis — producing warmer, more humid conditions than middle or east Tennessee cities. The 17°F heating design and 95°F/77°F cooling design require four-season HVAC.

Energy Code & Manual J Requirement: Tennessee Energy Code (IECC 2021). ACCA Manual J required for residential HVAC permits in Madison County and Jackson TN jurisdictions.

Local Electric Utility: Jackson Energy Authority (TVA distributor)

Building Department: City of Jackson Building Department

Local Trade Association: ACCA Tennessee