This paper documents efforts by the National Fenestration Rating Council to develop a database on annual energy impacts of windows in a typical new, single-family, single-story residence in various U.S. and Canadian climates. The result is a database of space heating and space cooling energies for 14 typical windows in 52 North American climates. (Future efforts will address the effects of skylights.) This paper describes how this database was created, lists the assumptions used in creating this database, elaborates on assumptions that need further research, examines the results, and describes the possible uses of the database.

Units: Dual