It's funny you should ask this, because I've asked a similar question
recently about whether they will help reduce heat, since I'm considering
honeycomb shades as a solution to a room that gets warm on sunny days. The
triple-celled ones are touted as having 4.5 R-value or higher and a low
summer shading coefficient of .24 which supposedly means that 76% of heat
transfer is stopped.
My skepticism is due to the fact that there will be gaps on the sides of the
shades in which heat can easily escape into the room. Not only that, but
the cells are open-ended which means that those wonderful air pockets that
supposedly stop heat from getting into the room in the summer are not even
sealed on the ends. So, until proven otherwise I suspect that the r-value
they claim those shades have is only a BOGUS/THEORETICAL R-VALUE based on a
reading taken only at the very center of a very wide shade. Am I wrong in
What I'm currently considering is double-celled room darkening honeycomb
shades that come with "energy saving side tracks." The side tracks are
mounted on the sides of the window frame and help seal those pesky edges. I
feel that the side tracks could help increase the chances that the shades
actually would stop the heat getting into the room in the summer (and stop
the cold in the winter).
They will pay themselves back in a short time , yes they are worth it.