. understanding of the code. iv 2009 INTERNATIONAL ENERGY CONSERVATION CODE Effective Use of the International Energy Conservation Code The International Energy Conservation Code (IECC) is a model code that. InternationalBuildingCode®, InternationalExistingBuilding Code , International Fire Code , International Fuel Gas Code , International Mechanical Code , ICC Performance Code , International Plumbing Code , International. Disposal Code , International Property Maintenance Code , International Residential Code , International Wildland-Urban Interface Code and InternationalZoning Code . The International Energy Conservation