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Heat loss DTD by climate zone or state?
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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Albert Einstein
According to this, then, if we go by -13F, then an 80-DTD isn't that far off.
We had some -20F days last year, and in a perfect world, I would hope the calculation included the coldest possible day, but 97.5% is pretty close, I guess.
You could size your heat for -20 and your cooling for 100 if your town will let you
https://www.energystar.gov/ia/partners/bldrs_lenders_raters/downloads/Design_Temperature_Limit_Reference_Guide.pdf?8fd5-1967