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The following information is an example of energy and cost savings for Boston and Phoenix.
 Heating Season Savings
In climates with a significant heating season, windows have represented a major source of
unwanted heat loss, discomfort, and condensation problems. In recent years, windows have
undergone a technological revolution. It is now possible to have lower heat loss, less air
leakage, and warmer window surfaces that improve comfort and minimize condensation. The
graph below illustrates the significant savings in heating season costs associated with
energy efficient windows for a house in a heating-dominated climate. In cold regions, this
means that windows are no longer an energy loser to be avoided -- increasing glazing area
with high performance windows can have little or no affect on total energy use.
 Cooling Season Savings
In climates that mainly require cooling, windows have represented a major source of
unwanted heat gain. In recent years, windows have undergone a technological revolution. It
is now possible to significantly reduce solar heat gain and improve comfort while
providing clear views and daylight. The graph below illustrates the significant savings in
cooling season costs associated with improved windows for a house in a cooling-dominated
climate. In warm regions, this means that high performance windows can face into the sun
if desired without great energy penalties -- although shading techniques remain
important.
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