We have a 15 x 30 north of west facing lanai enclosed with double pane argon filled panels and we use a portable floor air conditioner. It does very well 95 percent of the time but there are those few days a year when extremely hot and the sun is low in the sky that it just won't cool it off enough. I bought it at Sam's and there was one a bit larger that I now wish I would have chose. we do not open our sliders into the house to help cool it, only the AC. Inexpensive and does a good job.
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