Pertains to ANSI/ASHRAE Standard 90.2-1993, "Energy Efficient Design of New Low-Rise Residential Buildings," which was approved in 1993. A complex fenestration load change equation was included in the standard and was required to be used for determining compliance when glass area exceeded 125 ft2. A number of objections were raised concerning this equation. To assist the user in determining compliance for buildings with greater fenestration, a simple set of prescriptive requirements has been developed and is proposed in this addendum.The prescriptive requirements in this addendum were derived under the following conditions: to not exceed the energy use requirements for a residence built in accordance to the requirements of Standard 90.2-1993 with 18% fenestration area (conditioned floor space) equally oriented in each cardinal direction. The load change equation in 90.2-1993 was used to determine energy requirements.The model used to determine that the energy needs were not exceeded had the following fenestration distribution: 53% west, 26% east, 10.5% north, and 10.5% south.The model was evaluated for energy consumption in the following 12 U.S. cities: Atlanta, GA; Baltimore, MD; Boston, MA; Dallas, TX; Denver, CO; Los Angeles, CA; Lewiston, ID; Madison, WI; Miami, FL; New York, NY; Phoenix, AZ; and Burlington, VT.ANSI/ASHRAE Standard 90.2-1993, "Energy Efficient Design of New Low-Rise Residential Buildings," was approved in 1993.