Replacing Glass in French Door
Hello, my wife and I are looking at replacing some old windows in our house, and we've done some searching and found an installer and brand we like at a fair price. Our question is related to our French Doors.
We have 4 sets of double french doors (with 48" total span) on the front of our house. Evidently, this is a pretty rare and expensive fix. It will cost us 2-3 times the cost of all the windows in the house to replace these doors. I want to make clear that I realize you have to pay a fair price if you want a good installer and a good product. This comes down to we just don't think we can afford to do the doors with the windows, and we're likely to do the windows first as they are probably a bigger source of energy savings.
As the doors themselves are all in good condition we were wondering if it was possible to replace just the glass with a higher efficiency glass (they are all single pane at the moment, and we'd like to go to double pane and as efficient as we can get). If it is possible, would this be likely to save any money over a whole door/jam set up? More importantly would it make the door appreciably more energy efficient? The door is currently a wood door, with no drafts around it as it has "seal" foam strips to prevent this. I realize it won't be as good as a new door, but if we could get significant benefit over the single pane at a reduced cost, then it would be something we'd consider. ALternatively, if this doesn't work, as a stop gap until we can afford the switch, do the insulating window dressings really make any difference? I'd appreciate any advice we can get on a way that we could approach this for the doors.