Tropicool
We bought one of the Tropicool units from the Boat US catalog a week ago. I have always been skeptical of how effective these units could be, but was finally motivated by problems with our built-in refrigeration. The manufacturer claims up to 50 degrees below ambient.Based on one week of experience, I am pleased with the investment. See the attached catalog reference for the 19 quart model. These come in one smaller and two larger sizes.