One wall of my bedroom has sliding glass doors and it gets really cold at nite. I cannot afford to replace them. What can I use to sort of insulate the doors so as not to freeze at nite?
Are you familiar with the kits for insulating windows that include the plastic you shrink with a hairdryer? They make kits for patio doors, too...probably around $10. You can also hang blankets or quilts.
When it gets really cold outside, we have a piece of heavy duty clear plastic that we hang over our sliding glass door. I cut it to fit the door and put a border of masking tape across the top of the plastic. To the masking tape I have four small strips of self sticking Velcro. The match to the Velcro is on the woodwork of the door. It is white, same as the woodwork and is not noticeable.
My son went to WalMart & bought real thick insulated curtains that help to keep the warmth inside his bedroom.
I lived in an apartment for a year that had a sliding glass door in my bedroom. Oh boy, the drafts coming in were terrible, even with a heavy set of insulated drapes. So I rolled up newspapers into logs, fastened with rubber bands from the Sunday paper, and set the logs into the frame along the bottom.
It made a huge difference-no more drafts, and I was able to open and close the doors by removing the logs when I needed to use the doors.
I've also used bubble wrap on large windows to insulate, using duct tape to secure the wrap to the outer edges of the frame. You can't open the windows or doors if you do that, but it does really cut down on the heat loss and drafts.