10 CFR § 434.301 - Design criteria.

301.1 The following design parameters shall be used for calculations required under subpart D of this part.

301.1.1 Exterior Design Conditions. Exterior Design Conditions shall be expressed in accordance with Table 301.1.

Table 301.1—Exterior Design Conditions

Winter Design Dry-Bulb (99%)		Degrees F.
Summer Design Dry-Bulb (2.5%)		Degrees F.
Mean Coincident Wet-Bulb (2.5%)		Degrees F.
Degree-Days, Heating (Base 65)		HDD Base 65 °F.
Degree-Days, Cooling (Base 65)		CDD Base 65 °F.
Annual Operating Hours, 8 a.m. to 4 p.m. when 55 °F≤T≤69 °F		Hours.

[The exterior design conditions shall be added to Table 301.1 from the city-specific Shading Coefficient table from appendix A of RS–1 (incorporated by reference, see § 434.701). Copies of specific tables contained in appendix A of RS–1 (incorporated by reference, see § 434.701). can be obtained from the Energy Code for Federal Commercial Buildings, Docket No. EE–RM–79–112–C, EE–43, Office of Building Research and Standards, U.S. Department of Energy, Room 1J–018, 1000 Independence Avenue, SW., Washington, DC 20585, (202) 586–9127. Adjustments may be made to reflect local climates which differ from the tabulated temperatures or local weather experience as determined by the building official. Where local building site climatic data are not available, climate data from a nearby location included in RS–1, appendix C, (incorporated by reference, see § 434.701) and RS–4 Chapter 24, Table 1, (incorporated by reference, see § 434.701) shall be used as determined by the building official.]

301.2 Indoor Design Conditions. Indoor design temperature and humidity conditions shall be in accordance with the comfort criteria in RS–2 (incorporated by reference, see § 434.701), except that humidification and dehumidification are not required.