For the longest time I've been trying to find a good way to improve the overall insulation qualities of the windows on the South side of our house - but without doing something that was either too expensive or 'tacky'. I wanted something that worked at the right price and looked alright.
So a few weeks back I decided to pay Spotlight a visit - the plan being to buy what is called header tape (basically the top bit of curtain that the hooks hang into) then buy the additional fabric to make a properly lined liner for the curtains. The theory is that by doing this you make it that much harder for the heat to transfer through the window.
Whilst looking for the inside 'bulk' that was to make up the liner I found an interesting product called 'Insul-Bright' - basically this a woolen like sheet with a foil layer in the middle. The sort of thing one would use to line oven gloves. But looking at I realized this could be ideal to use as the window lining in its own right. Its color is a perfect white, it seems to have a reasonable strength in of itself, and due to the foil it has a tendency to want to lay dead flat...
So one windows worth of Insul-Bright was bought with header tape; this was then hand sown together to form two liners to hang between the curtain and the window. The result.. What a difference - basically I normally had a two bar heater running in my office to keep things warm and to stop my fingers becoming none functional - I noticed with the liner up that the number of times the heater clicked on was reduced by about half - its was paying for itself already!
I think two things are happening here: