Springfield Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 5A (cold-humid). Springfield's Connecticut River valley location produces slightly warmer summers than inland Worcester, with similar cold winters — the valley's air mass trapping effect elevates summer temperatures above the surrounding plateau.

Energy Code & Manual J Requirement: Massachusetts Building Code (IECC 2021). ACCA Manual J required for Hampden County HVAC permits.

Local Electric Utility: Eversource Energy

Building Department: City of Springfield Building Department

Local Trade Association: ACCA New England / ASHRAE New England Chapter