During the "snowmageddon" here on the east coast, I decided to use my RV in the driveway as an emergency shelter. So, when our family went out there last night (just to test it out), I noticed the windows have a draft. There is no obvious gap in the seals (this is a 2015 356QBQ 5th wheel unit) The glass is single pane.
So, I was wondering if there is a simple and cheap way that looks good that I could upgrade my windows for the future so the coach is better insulated?. I am sure most of the heat loss is coming from the windows. Any ideas?