Heat reflecting fabric
When ours went I ordered a roll of heat reflecting fabric from the factory here in the US. I had to buy way more than I needed but the factory price was about the same as buying just the yardage I needed from a local store. This fabric has a white side and a reflective side. According to the factory they work with the reflective side facing inside or outside. Was easy to cut and sew right onto the existing curtains--but you had to sew it correctly the first time as mistakes will show. It's been over a year and they are a blessing--cab are is now same temp as rest of coach (if we've been driving the engine provides more heat thru the floor even though dynamatted than comes in thru the glass). If you are interested in purchasing some of my remaining roll PM me.
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