I live in an older home with windows that build up frost in the winter, which indicates they aren't insulated very well. I am thinking of installing kits like these over the windows:
However, before I spend the time and money (and generate the additional plastic waste) I'd like to have a better idea of how effective they are.
Is there any research or studies on how effective these kits are?
I have heard lots of anecdotal evidence, so that's not what I'm interested in here.