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December 15, 2012


Don Humphrey

Hi John,
Don't take them into a Mine for protection.


Your result would differ for different outside temperatures and climates; i.e. the Tau would be shorter in Winter on a cloudy, rainy day than in Summer on a bright, sunny day. Also, you assumed a constant outside temperature when taking your data, and that was likely not the case from 2:15 am to 7:35 pm.

John Dunn

Actually, I didn't make any assumptions at all. I simply fit an exponential equation to the actual data and found it tracked rather well which surprised me a bit. That night and through the dawn and into the evening, the outside temperature fell a little, then rose a little after sunrise and then fell a little, but not by very much.

Don Humphrey

Wouldn't this data say something about
your home insulation. Looks good to me.

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