Hello all, It's been a long time that my wife is asking to install argon filled windows in our home. I haven't used them and I don't know how efficient they'll be. We are newly married, so I cannot deny her wishes. I'll be contacting the replacement windows and door service next week. But still, before taking a decision, I would like to ask suggestions from you all regarding this. Has anyone here used such windows?? I recently read many articles which gave a lot of advantages in installing argon gas filled windows. Is it really efficient?? What will happen if the argon gas leaks?? Is it dangerous??