3M Crystaline Window film vs Double Pane Windows

Thank you for all the useful testimonials! I had not made up my mind one way or the other, but the smaller air gap in rv windows does make sense. The noise issue is a significant issue, but I can put up with noise more than heat. I just hate it when it's is too warm inside So at this point if I can get a better deal on dealer in stock units despite not having double pane windows, at least I can add the window film afterwards.