News flash: math verified by real world observation

At the time of writing this post the outdoor temperature is 96F.  This is according to the Google and verified by my personal temperature/humidity probe.  It’s also very sunny with not a cloud in the sky.  So what’s the attic temperature?  I’m expecting a fairly high number due to high outdoor ambient temperature and lots of sun.  Drum roll please … the system measured attic temperature is 106.1F.  Not as high as I had thought it would be.  Since it’s Sunday and I have nothing better to do I took another “independent” measurement of the attic temperature.  Drum roll please … 104.6F.  Difference of 1.5R which is easily explained by placement.  I was not in the mood of crawling in the attic so my thermometer probe was only in the attic as far as I could reach from the ladder.  The system probe is closer to the ridge of the roof another 4ish feet up.

So there we go.  The math works, the hardware has been verified, and the reading has been verified in “the field”.