Nashville Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 4A (mixed-humid). Nashville has hot, humid summers (95°F/76°F cooling design) and genuine winters (16°F heating design). One of the fastest-growing major US metros with enormous residential construction volume.

Energy Code & Manual J Requirement: Tennessee Residential Building Code (IECC 2021). ACCA Manual J required for all Davidson County and Nashville metro HVAC permit applications.

Local Electric Utility: NES (Nashville Electric Service, TVA distributor)

Building Department: Metro Nashville Codes Administration

Local Trade Association: ACCA Tennessee / ASHRAE Tennessee Valley Chapter / SMACNA Mid-South