Most people are surprised to find out that there is a difference in the energy code requirements between Houston and other parts of Texas. In fact, the IECC recognizes three different regions in Texas in their 2009 code, with three general regions with different requirements for windows, skylights and doors.

Custom Windows values knowledgeable contractors and consumers, so we are pleased to provide the IECC 2009 code summary for Texas below which also helps explain what the ratings mean and how they differ between cities as close as Dallas and Houston!