On 28 Jul 2007 14:18:17 -0400, wrote Re
how to find out if walls of house are insulated?:

Rv = 0.67(Tw-Ta)/(70-Tw).

For instance, if you measure a Tw = 67.5 F wall temp with your $50 Raytek
MiniTemp when it's Ta = 30 F outdoors, Rv = 0.67(67.5-30)/(70-67.5) = R10.

Would this be valid for cooling? For example Ta=90F, Inside temp =
70F, Tw=72.5F
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