Beginning in 2007, all ENERGY STAR® labeled homes must meet the Thermal Bypass Inpection Checklist (PDF) criteria.

A thermal bypass is a design or building flaw which allows heat to enter or leave the building and increases the cost of heating and cooling your home. A bypass compromises the thermal properties of your insulating and sheathing materials. In many cases, a bypass can interfere with the insulation of a wall or building system, causing higher energy use, moisture-related material destruction, and decreased comfort for those living in your home.

Below are additional resources to help you address concerns about thermal bypasses.

	New Guidelines for ENERGY STAR Qualified Homes and supporting materials from the Environmental Protection Agency.
	Download an ENERGY STAR Guide on the Thermal Bypass Checklist. (PDF)
	Visit the U.S. Department of Energy's Building America web site
	Browse various Builder's Guide books at the Energy & Environmental Building Association's bookstore