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Heat loss DTD by climate zone or state?

GcrackerGcracker Posts: 28Member
Can anyone tell me if there is a reference or even a generally-accepted rule of thumb for DTD in a heat loss calculation by state/climate zone? I have had trouble locating this specific resource, and could use something more than my layman's assumption that you look at climate data and go from there.

Specifically, in climate zone 6, what DTD would be considered prudent?


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