Original Window Specification.
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This area allows you to specify the basis point
for describing your original window type.
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For assessing an existing house select the window
which matches the physical description of the windows currently in your house to
assess the benefits that can be obtained by upgrading your windows.
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For New buildings select the lowest performance
standard window type that you are considering to assess benefits that may be
obtained.
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Note. The window selection will provide the
performance values for all of the windows in the generic house selected.
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