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and CDD are used for quickly estimating seasonal energy loads that can be
applied to envelope heat losses and efficiency of the HVAC equipment. This
is useful in making decisions regarding the thermal envelope and equipment cost
and benefit. Where as insuring comfort is dependant on the coldest or
hottest extremes, the design temperature. Satisfying the extremes can
sometime reduce the seasonal efficiency. This is likely the case with
cooling. Even though there is global warming that can have catastrophic
consequences with only a few degrees, the annual variations in any climate can
be far greater than the global warming trend.<SPAN
style="mso-spacerun: yes"> </SPAN>The best number is achieved by data
collected from as many years as possible.<SPAN style="mso-spacerun: yes">
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