The BayAir system cools and dehumidifies your cabin without requiring shore power or a generator.

2.  But I can buy another device that does the same thing for less...

Most other units do not allow you to use your boat's electrical system as a source of power.  The BayAir system does, which allows the BayAir system to be truly portable.

3.  How does the BayAir Air Conditioning Work?

The BayAir system circulates ice water through a heat exchanger
with a fan blowing across the heat exchanger. By using ice and water, the BayAir system eliminates power hungry compressors and environmentally harmful CFCs. The circuitry of the patented BayAir system maximizes the cooling duration from a given amount of ice and water. In addition to providing cool air, the BayAir system also dehumidifies. Only the BayAir system provides the virtues of traditional Freon based air conditioning systems in places where 110 volt power is not available or practical.