I have double paned windows...17 years old and climbing.. not gas filled. Seem to work pretty well... especially since I installed solar tint on the outside panes. Wow... what a difference and they say the solar film blocks heat better than any window made. 70% of the solar heat is blocked and 99% of the UV rays. I spent under $500.00 installing the film myself and it looks fantastic. BTW, if you're not a person that is fairly handy and doesn't pay attention to detail, then don't try to install yourself. Precision is key. In window tint...cleanliness is Godliness.
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