The Cdn/US border has been closed now for 10 months so rather than enjoying glorious warm winter weather in AZ we are freezing at our summer spot in Ontario, knee deep in snow and cold temperatures. Heat loss through the windshield has been stopped using an inside type of sunshade we found on Amazon.ca (
RV WINDOW SUNSHADE REFLECTOR KIT. COMMERCIAL GRADE , DOUBLE THICKNESS). It looks and feels just like the sunshade you may need when you store your RV.
It's made in Toronto (Ships from Canada and sold by JR Global Sales) fits our Adventurer 37F perfectly and worked for cold like a charm - you may find something similar on Amazon.com
We hope you find what you need. Stay Safe, T&J