We are experiencing problems with our A/C. The return ices over and then the compressor shuts down. It only happens when the ambient temperature is 15-20 degrees warmer than cabin temp. We live aboard our boat in N Florida so this time of year we experience many days of 95 degree or higher temps. It would be more comfortable if we could cool the cabin below 80. The unit is a Mermaid Air 16,000 BTU Reverse Cycle. Have contacted Mermaid on several occasions. They have been more than willing to help but so far none of their suggestions helped. Anyone else have this problem? The boat is a 37.5.