Nashua Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 6A (cold-humid). Nashua's NH-MA border position shares Manchester's climate profile — 2°F heating design and 88°F/71°F cooling design — with the same cold winter and modest summer pattern.

Energy Code & Manual J Requirement: New Hampshire State Building Code (IECC 2018). ACCA Manual J required for Nashua and surrounding Hillsborough County HVAC permits.

Local Electric Utility: Eversource Energy (Public Service of NH)

Building Department: City of Nashua Building Department

Local Trade Association: PHCC New Hampshire