Sydney

Something I stumbled upon the other day that caught my eye. Retrofitting removable double glazing!

"Up to 40% of a home's heating energy" can be lost through windows.

This youtube vid outlines how to do it. You could probably find the bits and pieces at Bunnings, ebay etc. I guess shipping costs for a big piece of clear acrylic would probably start to get expensive, but maybe it can be ordered somewhere, and pick up yourself.

The other temporary one, which is even simpler though not as elegant is bubble wrap. Basically, you can just spray water on your window and the bubble wrap will stick! The downside on is you don't have a view out your window, and if you want to open a window, you need to pull it down, then reapply it again when you close the window.

The best thing about these it that they might be useful for anyone renting. Also if you're in units etc where you can't get fully double glazed windows because the body corporate won't allow anything different. You could still apply this on the inside cheaply and easily with most of the same benefits of getting fully double glazed windows installed.