This 2004 edition, which supersedes Standard 90.1-2001 (I-P), has several new
features and includes changes resulting from the continuous maintenance
proposals from the public. The standard has been completely reformatted for ease
of use and clarity. The climate zones have been reduced from 26 to 8 and the
Lighting LPDs have been reduced as well.
The purpose of this standard is to provide minimum requirements for the
energy-efficient design of buildings except low-rise residential buildings.
This standard provides (a) minimum energy-efficient requirements for the
design and construction of 1. new buildings and their systems, 2. new portions
of buildings and their systems, and 3. new systems and equipment in existing
buildings and (b) criteria for determining compliance with these requirements.
The provisions of this standard apply to the envelope of buildings, provided
that the enclosed spaces are 1. heated by a heating system whose output capacity
is greater than or equal to 3.4 Btu/hft2 or 2. cooled by a cooling system
whose sensible output capacity is greater than or equal to 5 Btu/hft2. The
provisions also apply to the following systems and equipment used in conjunction
with buildings: 1. heating, ventilating, and air conditioning, 2. service water
heating, 3. electric power distribution and metering provisions, 4. electric
motors and belt drives, and 5. lighting.
The provisions of this standard do not apply to (a) single-family houses,
multi-family structures of three stories or fewer above grade, manufactured
houses (mobile homes) and manufactured houses (modular), (b) buildings that do
not use either electricity or fossil fuel, or (c) equipment and portions of
building systems that use energy primarily to provide for industrial,
manufacturing, or commercial processes. Where specifically noted in this
standard, certain other buildings or elements of buildings shall be exempt. This
standard shall not be used to circumvent any safety, health, or environmental
requirements. 182 pp.