2021 IECC requires all new commercial buildings to complete and post a permanent Thermal Envelope Certificate. This certificate template can […]

For Homeowners and Realtors. Are you interested in buying an energy efficient home? Do you want to learn how to make your home more energy efficient? This checklist can help you quickly assess a home's energy performance and construction.

For Building Code Officials, Architects, and Engineers. This Residential Energy Code Checklist is intended to assist with plan review and site inspection for the Illinois Energy Code.