"The heat transfer properties of dark comb may be greater than new comb."

Very unlikely.  The main barrier to heat transfer is generally the film coefficient at the interface between the solid and air.  That is why it makes no difference in heat transfer if you use glass, plastic or a sheet of aluminum in your windows.  Now I will admit it is hard to see thru aluminum.  But the fact is it is just as good at stopping heat flow thru a window as plastic or glass as all three have the same film coefficient between the air and the solid.  Those of us who live in cold winters have all seen practical examples that glass is not a good heat barrier.  In a cold climate and a single pane window it is common to see ice on the inside of the window where the air temp is way above freezing.  That ice forms because the glass temperature is roughly half way between the inside temp and outside temp.  So, if it is negative 20 outside and positive 70 inside the glass temp is 30 deg F and no wind outside ice can freeze on the inside surface.  If there is a wind outside the glass temp can be even lower as the wind lowers the film coefficient on the outside of the glass.

Dick

HL Mencken said: "The whole aim of practical politics is to keep the populace alarmed — and hence clamorous to be led to safety — by menacing it with an endless series of hobgoblins, all of them imaginary. "

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