When I considered enclosing my lanai, Munn's told me that they would not modify the existing ductwork to heat and cool the extra space unless the permit provided for raising the floor and adding additional insulation and electrical outlets and meet all building codes. However, they would install a separate HVAC unit in the lanai. Apparently, this is a loophole in the permitting process because the separate unit is called a dehumidifier, not an HVAC unit, on the county permit. Although the separate unit, which many houses have, does heat and cool the lanai space.
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