[Zeke]

Scott, I have personally experienced the lack of infrared radiation on sliding doors while installing. Open one up on a sunny day and stand directly in the sun and then stand behind the open panel that is parked in front of the fixed panel. That's where it's doubled up giving 2wice the effect.

That alone will sell a door to any skeptics.

Not only that, but new windows keep dust, pollen and noise out due to the excellent weatherstripping engineered into all new certified windows. It's not the glass so much that kills noise. Sit in your car with the windows up and then crack them just a bit. Listen to the difference. Then realize that cars don't have dual panes.

It's all in the weatherstripping.

Window sales people hate me because I can provide the performance w/o the upgrades which are all profit. Sound familiar?