Found that one a bit ago from 2012. Seems they are using chamber of commerce numbers instead of real world weather station numbers. Good formulas but it's a shame they aren't using accurate data to figure their temps. I'm not the only one to figure that out because several large hvac contractors are using 105 for their temps too. Found a reference to one of them getting grief from a city on their sizing until they showed them the data.
We exceed their 1% number in just two days. 8 hrs a day over 100* is common. Just frustrating to see it touted as the best thing since sliced bread only to find out some of their numbers are off.
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