IMPACT OF ASHRAE STANDARD 169-2013 ON BUILDING ENERGY CODES AND ENERGY EFFICIENCY
A more recent period of weather data published in the
ASHRAE 2009 Handbook of Fundamentals was used
in developing ASHRAE Standard 169-2013. The new
Standard remapped counties to climate zones based on
the new weather data. More than 400 counties out of a
total of over 3,000 in the U.S. were reassigned to
different climate zones and most of the counties were
reassigned to warmer climate zones. Many code
requirements, such as for wall insulation, are less
stringent in warmer climate zones. Thus, when a county
is reassigned to a warmer climate zone, new buildings
built in that county are likely to be less energy efficient
than before. The new county-to-climate zone mapping
in ASHRAE Standard 169-2013 has been adopted by
Standard 90.1 and may be adopted by other codes and
standards as well. In this paper, we present the impact
of changing the county-climate zone mapping on
energy codes and building energy efficiency in the
country. The analysis shows that adopting the new
county-to-climate zone mapping in ASHRAE Standard
169-2013 results in an overall weakening of ASHRAE
Standard 90.1-2013 at the national level while the
impacts at the state level can be dramatic, as there are
several states where large population centers are
reassigned to a warmer climate zone.
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