When had the same concernes for we have a WNW Lanai exposure. With only a screened lanai it got hot, wet and dirty in the summer. I wil tell you the kind of glass windows you buy would make a tremendous difference. You want low-E insulated glass and there are different grades of Low-E. Our contractor sent us to a window specialist who was his supplier and he helped us out.
I dont know if your full time or a snow bird,but if you enclose the lanai and have no ventilation you have to be concered about humidity/mold build up. YOu said no AC but one option could be a Mitisubusti Mr SLim ductless AC unit...it would really improve the quality of that room especailly with a western exposure. For example you will probably have different type of furniture in that room if it is enclosed but if you leave the windows open all the time in the summer, thinsg could really get wet. We do get some strong rains with blowing winds here during teh rainy season....and I dont think I would wnat to keep worrying if my windows were closed or not! WE had our lanai insulated and it does serve a purpose for both heat and AC functions.
We love the enclosed lanai w/heat/ac, truly made that area a year round living space.
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