Options for insulating glass sliding patio door in master bedroom other than replacing it?
The sliding door that is installed may be a cheaper door and does not have a &quot;thermal break&quot; in it's construction. If you are the purchaser of one of these doors you should insure that the door has this thermal break. That said, one way to help correct this cold problem would be to make sure that the perimeter of the frame is sealed  (caulked) to lessen air infiltration. It can be carefully caulked on both the outside and the inside. Another &quot;fix&quot; would be to install a storm door for that sliding door. I know that these do work because I installed one in my last house where I had the same problem as yours. To find a storm door you could search for &quot;patio storm doors. I searched and came up with Larson and Columbia. You could also shop for these at Lowes or Home Depot and they can have it installed for you if you want. Hpoe this helps.