title: Building Environments: HVAC Systems
author:  Alan J. Zajac 
description: Creating healthy, productive indoor environments can be the greatest challenge facing those involved with the buildings. Whether you engineer, install, service, or operate heating, ventilating and air conditioning systems, Building Environments: HVAC Systems is for you. This comprehensive, easy-to-read text builds your understanding of HVAC systems and the controls that manage them. Through illustrations and realistic examples, Building Environments: HVAC Systems clearly and concisely explains how mechanical and control systems work together to create quality building environments. You'll learn the technical details behind these complex systems without being overwhelmed.Its unique style makes this fully illustrated text the best single reference if you are entering the HVAC industry or want to expand your knowledge of HVAC and control systems.
zlib_text: BUILDING SYSTEMS
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  AN OVERVIEW OF THE
  U.S. BUILDING STOCK
  Richard C. Diamond, Ph.D.
  Lawrence Berkeley National Laboratory
  Berkeley, California
  6.1
  INTRODUCTION TO THE U.S. BUILDING
  STOCK
  From the skyscrapers of Manhattan to the Victorian houses of San Francisco and the shop-
  ping malls of Anytown, USA, buildings in the United States are remarkable for their vari-
  ety. Variety in the type of building (commercial warehouse, manufacturing facility,
  institutional and office buildings, apartment buildings, condos, single-family dwellings,
  mobile homes, etc.) translates to variety in occupancy and use, which, in turn, means dif-
  ferences in energy requirements and indoor air quality concerns.
  Since the late 1950s, energy prices in the United States have been so low that there has
  been little concern for energy-efficient design. With the oil shocks of the 1970s, an
  increased awareness of energy and the environment led to greater interest and research in
  the use of energy and 