302.1 Exterior Design Conditions: The heating or cooling
outdoor design temperatures shall be selected from 0.6 percent
column for winter and 0.5 percent column for summer from the
Puget Sound Chapter of ASHRAE publication "Recommended Outdoor
Design Temperatures, Washington State, ASHRAE." (See also
Washington State Energy Code Manual.)
302.2 Interior Design Conditions:
302.2.1 Indoor Design Temperature: Indoor design
temperature shall be seventy degrees F for heating and
seventy-eight degrees F for cooling.
EXCEPTION:
Other design temperatures may be used for equipment selection if it results in a lower energy usage.
302.2.2 Humidification: If humidification is provided
during heating, it shall be designed for a maximum relative
humidity of thirty percent. When comfort air conditioning is
provided, the actual design relative humidity within the comfort
envelope as defined in Standard RS-4, listed in Chapter 7, shall
be selected for minimum total HVAC system energy use.
302.3 Climate Zones: All buildings shall comply with the
requirements of the appropriate climate zone as defined herein.
ZONE 1: Climate Zone 1 shall include all counties not
included in Climate Zone 2.
ZONE 2: Climate Zone 2 shall include: Adams, Chelan,
Douglas, Ferry, Grant, Kittitas, Lincoln, Okanogan, Pend Oreille,
Spokane, Stevens, and Whitman counties.
[Statutory Authority: RCW 19.27A.020 and 1990 c 2. 91-01-112, §
51-11-0302, filed 12/19/90, effective 7/1/91.]