I sell windows for my living and I can say every manufacturer will void their warranty on they window glass if an after market film is applied.
The reason the seal can/ will break is that the heat builds up between the panes of glass and caused the seal to expand and separate. Because the film is on the exterior of the face of the glass rather than the interior face allows the heat to build up inside.
It would be a far better thing for you to go to a glass company and have them replace all your glass with Low E argon. I would suspect that the cost of that vs the film is not a lot of difference. Plus the glass seal is warrantied for usually 20 years and you get a better insulating product.
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