JerryR,
In Florida, when it is say 90 degrees and trying to keep the home at 76 degrees, that is only a 14 degree difference. Therefore, windows just doesn't play in the building requirements for energy efficiency but safely from hurricanes do.
While temperature differential may be only 14 degrees I just measured my daughters sliding glass doors with a heat gun. The doors are factory tinted relatively dark and the glass was 112 degrees. The heat radiating off them as horrible. You could stand a foot way and feel the horrible heat. In my home I have double pane, hurricane impact insulated low-E glass on all windows and glass doors. At my home we replaced the windows and glass doors last year. It made a Huge difference.We have 34 windows and 24 feet of 8 foot tall sliding glass doors. That is a lot of square footage of glass.
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