WE also just enclosed our lanai with double pane, insulated, LOW-E, Glass sliders over transom windows. Our heat/AC is connected directly to the house unit (Contractor had to do a HEAT/AIr Efficiency study conducted by Munns at the countys request before county would approve this.) When I say connectd to teh main unit I dodnot mean simply extending the vents in the great room....new heat/ac ducts were run directly from teh furnace to the new lanai area so we get equal heat/ac air flow in all rooms. WE also took out the sliding glass doors to make our great room even more useable.... and this is the BEST investment we ever did. I would not recommend going cheap on windows especially if you have any western exposure in the summer. You need LOW-E. Cost compared to acrylic is only slightly more but the advantages far outweigh acrylic.
The rain and dirt problem plus the summer heat were jjust toooo much for us to keep a screened lanai.
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