I am replacing a patio door with one fixed full view panel, and one inswinging door with full view panel. Original to the house, the current set appears to be single paned and my wife complains all the time about the cold during the winter. At two different box stores, I priced the replacement. I believe the brands were Feather River, Andersen, Jeld Wen, Pella, and Reliabilt. All but Pella were spec'd with "low e double pane glass." The Pella came with Argon filled glass. The price differences, even discarding the very expensive Pella unit, were significant, ranging from $600 to $1600. Now I understand that different quality materials, manufacturing methods, and warranties account for much of this difference; no questions there. My question is whether there would be any differences in the INSULATING qualities of the glass panels in the different units. If I buy foam or fiberglass, I can see an "R" value printed on the product packaging. However, none of the manufacturers of these doors provide any similar value for the insulating qualities of the glass panels. It is either intentional, or there is no difference among them, I guess. Anyone know anything different?

Was making coffee this morning and noticed the counter was wet. Paper towel discovered window seal is leaking. Outside there is some caulk missing in the corner, both bottom corners actually. Can i just get some simple clear silicon caulk for the outside, gut the inside insulation and spray in expanding foam for air and water tightness? Just moved in here 3 weeks ago, HEAVY rain today and the first since we moved in. Went around checking the place out after and this is the only water leaking in. Do I need to pull the outside window trim off as well? I am going to open up the bottom peace of trim inside and check to see if water is leaking there also. ' [url=http://s530.photobucket.com/user/fireshaun/media/photo_zps91cdbc51.jpg.html][/url] [url=http://s530.photobucket.com/user/fireshaun/media/DSC_0041_zpse50a101a.jpg.html][/url] [url=http://s530.photobucket.com/user/fireshaun/media/DSC_0042_zpsa7b04c1b.jpg.html][/url] [url=http://s530.photobucket.com/user/fireshaun/media/DSC_0038_zps93b55da7.jpg.html][/url] [url=http://s530.photobucket.com/user/fireshaun/media/DSC_0039_zps34be42db.jpg.html][/url] [url=http://s530.photobucket.com/user/fireshaun/media/DSC_0040_zps50d0d958.jpg.html][/url] Thanks for the help in advance.