Nobody loves acronyms more than the military and intelligence agencies, so “NAC”, the popular abbreviation for “No Apparent Change”, is commonly used in updated reports to indicate that whatever is currently being observed or monitored has not changed much from previous versions, a convenient way to save time and space.

In this case, I am reporting that NAC applies to the newly updated official policy of the National Association of Home Builders on green building and sustainability. Allow me to explain…

THE SIZE OF NEW SINGLE-FAMILY HOMES completed declined last year, dropping to a nationwide average of 2,438 square feet, according to detailed information about the characteristics of new homes completed in 2009 that was released recently by the Census Bureau.