Interesting..

For winter I'm trying to insulate. For summer, insulate and reflect back
the sun's radiant heat. In the winter, I'll leave the window clear to
absorb the radiant engergy.

So I was going to somehow apply aluminum foil to one side and direct that
inwards in the winter and outwards in the summer.

I should have enough material to do 3 of my 4 windows:
winter - west, then east, then 1 of 2 south (on overcast days and at night)
summer - 2 south and then west (to block direct sun)

"ransley" wrote in message
...
On Dec 2, 2:29 pm, "Kevin" wrote:
I'm thinking to cut to fit pieces of 2" polystyrene for my shop windows
for
use in the winter (east and west) and summer (south). These are double
hung
windows with a good 2" recess where the foam should fit in fairly well.

Other than it being 'pink' - it should be about an R10. One sheet should
cover 3 of my 4 windows and hopefully significantly reduce the amount of
hours on my electric heater.

This is for my "office-side" of the insulated shop. 23x11 with a 220V
heater. Four 34 x 44 windows.

I was also thinking to spray adhesive aluminum foil to one or both sides
(sun exposure side in the summer).

The sheet was $24 and should be enough to cover 3 windows.

Thoughts?

It works to save energy but dual pane glass can crack from reflected
energy, I painted foamboard black and put it in a window, it not only
cracked the single pane glass but the low winter sun melted the
foamboard. I was suprised and realised that for days I was smelling
the sun melting the foam. I removed it and took it outside, even at
about 10f out the flat black paint got the panel to near 95F. I used
brown paint and was ok, the black realy absorbed the suns energy. Some
Window Manufacturers have in writing using cellular shades can void a
warranty. If they are dark shades, sealed on the sides they do crack
windows when then sun hits them. I guess when its below zero out they
warm up to fast when the sun rises and the dual panes expand unevenly.
A lighter color is better, but research it more if yours are dual
pane. I even saw the foam board melt outside in 10f, a suprise. The
low winter sun and snow reflection has alot of energy.