If you have attic access to the lanai, you might want to try the less expensive idea of extending the existing vent from you central unit. Only cost me a few hundred bucks. Works great. That was in a home with a small 8x14ft lanai.
I also have a 9x20ft lanai that I do not think has attic access. I am going to try a 1200 btu portable, which should be overkill. It also has a dehumidifier and heat pump. It has a window vent adapter, but I am thinking of venting it via a dryer duct to the outside. While using it on A/C setting, it does not fill the small water tank, because it vents the water via the duct out the exhaust. Portable units are very inexpensive. Split units cost about as much as replacing your central unit, but work very well. In my opinion, split units are overpriced, even if they do work exceptional.
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