I will be installing the clear plastic window film on my glass sliding door for the winter to minimise heat transfer (it's an old door). I have the option of installing the heat-shrink type on the inside (with double-sided tape), or the regular type on the outside (with tack strips to the wooden frame). There is an awning to protect it from the elements.
What would you choose and why?
PS: This door (and most of my windows) exhibit condensation on the inside during the coldest winter days. Lowering the humidifier (or even turning it off) only helps a little. I heard this is a problem with using a setback thermostat.