Montpelier Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 6A (cold-humid). Montpelier's inland upland location produces very cold winters (-10°F heating design) — colder than Burlington — and warm summers (86°F/71°F cooling design). Cold-climate heat pump performance is critical.

Energy Code & Manual J Requirement: Vermont Residential Building Energy Standards (RBES/IECC 2021). ACCA Manual J required for all Washington County HVAC permit applications.

Local Electric Utility: Green Mountain Power

Building Department: City of Montpelier Department of Planning & Community Development

Local Trade Association: PHCC Vermont