Why are new climate zones being proposed?
The new climate zones are intended to make the IECC shorter and easier to use. In addition to enabling the elimination of more than 40 pages of maps and many pages of commercial envelope tables, they will allow commercial and residential sections of the code to use a common set of climate zones. For the first time, users of the IECC will be able to determine what requirements apply anywhere in the United States without having to obtain climate data (e.g. heating degree days) from some other source.
