"Bonnie Jean" wrote in message

I have one of those birdfeeders that goes into a window like an air
conditioner. I haven't used it in years but would like to. I need to put
something on both sides since it doesn't reach the edges of my window. I
was
thinking of using Styrofoam boards that I've gotten from packaging. It
would
be easy for me to cut into the proper size. I would then paint it to blend
with the wall.

But is the wind and cold going to come right through it? Should I just set
it up in the warmer months to avoid a draft in my bedroom?

Depends on how well you seal things. The cold will not pass through the
foam, but surely will any gaps. I'm not familiar witht he feeder so I don't
know exactly how it fits.