Before you can "extend" your existing AC to cover additional space, the contractor is required to test your AC for adequacy. Rather than extending our existing AC into our enclosed lanai, we opted to add a Mitsubishi wall unit that handles humidity, heat and AC. Very convenient. We only have to put it on when we need it, rather than having the AC/heat run in the lanai when we don't want it to. For example, this past week when we had those 2 cold days, we turned on the heat in the lanai for about 15 min to get the chill out, but we did not need the heat in our main residence area.
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