For the owner who tied your lanai into your existing heating/cooling system, the company that did this is supposed to report this to the county so they can raise your taxes. I looked into this myself and found 2 issues: they report this to the county so taxes will go up and 2) most systems installed in the villages are under powered. If you look at any of the sizing charts for hvac units for the sq foot size of your house, your hvac unit undersized by a minimum of 1/2 - 1 ton. Then you try to add another few hundred of sq feet to the hvac’s coverage, you will be over running the hvac system. I had multiple vendors come out to look at doing this to my system and they each told me this and did some searching on the web and we are undersized. The main reason builders/hvac installers do this is to let the hvac system run a little longer to get rid of the humidity in the house.
Now for the facts of using my enclosed lanai 1 summer without a mini split and now months of hot weather with a mini split: my lanai is much cooler with the mini split and since my house doesn’t over work to cool an additional 350 sq ft, my overall electric bill is lower.
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