Resources Searchable database of WCEC’s Case Studies, Reports, and Academic Papers. Read about WCEC’s latest notable progress here. We publish a monthly newsletter. Please sign up here to be added to our mailing list. Open source programs and plug-ins by WCEC engineers designed to assist in data analysis of HVAC-related research. WCEC’s project-based videos, presentations and webinars. TDV is a code compliance metric meant to incorporate the societal and environmental impacts into the cost of energy during a given hour of the year.