A little off target here. We installed a 6500 btu Mermaid Air into our 2007 Sailfish. The boat did not come with air from the factory.
Mermaid Marine is based in Ft. Myers, FL and is known for customer support after the sale and easy installation. I very much found both to be true.
We just took a trip around south FL. The unit could not keep up during the record heat during the afternoons. We carried a sunbrella shade that extends from the hard-top to the bow to keep the cabin in shade. It may have kept up better if we put that up. But we didn't want another item to fold up and put away before an early start in the morning.
So we stayed in the pool until the sun was low on the horizon.
As soon as the sun was low, the cabin cooled down. At night it was plenty cool enough.
Last summer we cruised the Great Lakes and the Mermaid 6500 kept up just fine there. But this July heat wave in south FL was too much for it during the heat of the afternoon.