Gap at edge of insulating blinds


What's a good way to seal the edges of those cellular insulating blinds (such as Bali and Hunter Douglas). They leave a small gap at each side so that the things move up and down easily, but that's a source of heat loss as far as I can see. I was thinking maybe a thin trim of sponge insulation strip or a strip of wood around the edge on the inside face.
Any tips welcomed
DeanB
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dean wrote:

If you're that concerned with the heat loss it would make more sense to use some of that heat-shrink clear plastic directly onto the window sash.
R
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