For those living in colder climates, Walmart and the big box stores carry a window insulation kit consisting of thin transparent plastic film and 1/2 wide thin double sided tape. Duck Brand is the current Walmart product. I believe 3M introduced the product in the early to mid 80s. Been around a long time though improvements in window technology have virtually eliminated condensation from new windows.
The tape is sold separately for a few dollars given that a kit for 10 windows including 168 feet of the 1/2 tape retails for USD $12.95
Tape is very very thin, adheres to most surfaces and pulls off for example, painted molding without damaging the surface. A sharp xacto knife etc. can be used to cut tape pieces into 1/4" wide or narrower strips.
I have used it to adhere plastic/acetate windows to plastic diesels.