Insulating curtains for a sliding glass door?
I have a large two-pane sliding glass door in my den (same room as my woodstove). While it provides nice views during our 10 hours of winter daylight, it just loses heat during the 14 hours of darkness. My IR gun indicates 10-15 degrees of temperature difference, compared to the exterior siding.
I see lots of insulating curtains on the market, but most seem like they would create a convective loop due to not sealing around the edges. I would want to seal the curtains against the door frame, at least across the top and bottom, and even better, all around the perimeter. Is there a product out there for this purpose, with insulating properties in mind (rather than avoiding solar gain?)