Indoor storm windows question. Does anyone have some experience?

User: michael.kilian@gmail.com

Vendor: Drive Green - Green Energy Consumers Alliance

Action: 2589 - Insulate and Air Seal Your Home

This is not a testimonial but a query.  I've heard that indoor storm windows can greatly improve the efficiency of your windows (especially in winter) without having to replace the window.   Has anyone used these?   Pros and Cons?   They look great on the web but I have to wonder if in a larger window (say 30" x 60") if they are rigid enough?  Do they impact the light coming into the room?

I think I have an ideal application for indoor storm windows but would appreciate any first hand experience with them.

Also, I'm wondering if I can build these myself, perhaps making them blend into the trim of the existing windows a little better. Has anyone out there tried to do this?

You can contact me at: michael.kilian@gmail.com