Quote:
Originally Posted by chrisgerman1983
R value is pretty irrelevant, glass has no R value but even single pane windows keep the cold out and the heat in.
|
Error in the logic there.
R value is very relevant in this specific discussion. Hood insulation can only be measured as such. The hood is already enclosed unlike a window before the glass is added.
It is also relevant as all the other avenues to shed heat show dramatic losses that the minimal R value hood insulation can provide can't compete with.
Your example is not comparative.
A better one would be if adding a piece of cardboard to a window made the house measurably more insulated.