
It's no secret that from an insulation point of view, windows are one the weakest links in your average home. Even when they're closed most of the heat loss and gain will come through windows. Double glazing is a fantastic option, but what if you're renting, need something quickly or the budget just doesn't extend that far?
Clear Comfort is a heat shrinkable transparent plastic sheet that is attached to the inside of your window frame. It acts as a secondary glazing by trapping a pocket of air between the two surfaces and it's a simple DIY option for renters or budget renovators.
Read More: Clear Comfort, made in Australia
(Image: clear comfort; Video source: Green it Yourself)

Shaw's Original Fir...
We use this in some of our windows (the ones not accessible to the toddler) but the tape pulls up paint and/or comes apart in less than a year so it has to be reinstalled every winter. It's a PITA.
I'll have to check out the plexiglass storm windows. Thanks trishdom for the suggestion!
Isn't this just the same stuff that you can pick up at any old hardware store? Clear Comfort's prices are much higher than what I'd expect (and frankly not economical if you remove them at the end of the season). Ubless it is somehow MUCH more officient, I can't make sense of the price difference. I think the stuff I just purchased is called Frost King (?) from Home Depot for about $7 for a three window kit.