We had Aluma-tek enclose ours with low-e sliding glass windows almost 5 years ago. The lanai is 11x15. Sun Kool wanted to install a split ac unit for $5000, to which we said no. I asked the guy about tapping into the existing duct work and installing a vent in the lanai ceiling, which after much hemming and hawing, and talk about possible code violations, he admitted that they could do. They charged us $850 which included insulating the lanai ceiling.
Best decision we made as we can and do use the lanai 365 days a year.
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