Clarksville Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 4A (mixed-humid). Clarksville's Cumberland River valley position produces hot, humid summers (95°F/76°F cooling design) and moderately cold winters (15°F heating design). Both heating and cooling require robust four-season HVAC capacity.

Energy Code & Manual J Requirement: Tennessee Energy Code (IECC 2021). ACCA Manual J required for residential HVAC permits in Montgomery County and Clarksville area jurisdictions.

Local Electric Utility: CDE Lightband (Clarksville Dept. of Electricity, TVA distributor)

Building Department: City of Clarksville Building & Codes Department

Local Trade Association: ACCA Tennessee