I've heard of Thermal Glass Coat (http://thermalglasscoat.co.nz/). I've not actually seen it in action but apparently they'll come out and do a demo with treated and untreated glass with a heatlamp etc.
If you don't like the idea of sticking tape on your window frames, lots of sites advocate cutting bubble wrap to size, spritzing the window with water, and placing the wrap on so that it clings. It is claimed that this keeps twice the amount of heat in.
Do people in the real world actually put bubble wrap on their windows? Seriously?
Yes. For the past 2+ brutal winters (infact since quakes) people resorted to it in CHC when there was physical holes and gaps in walls etc to try and slow the overall heat escape rate
Likewise the most recent empty black coke cans on the window....
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