Is it the average mean, or the average low temperature I should use to calculate BTU needs and condensation points?
So I am calculating whole wall R-values and condensation point within the wall…..
In my calculations so far I have used the average “low temp” of the coldest month. Actually I used a temperature just a bit 1-2 degrees colder than the average low temperature listed. But in further reading, I noted that some only use the average “mean” temperature of the coldest month, and not the average of the “low” temp. Which is it…cause it would “mean” the difference in a few inches of insulation on the exterior?
Zone 6A – 8200 or so Heating degree days
For my town – January 30 year data is: MAX 27.1F / MEAN 15.3F / MIN 3.5F
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