Isotherm Compact Air Cooled Marine Refrigeration Systems use air which is blown through the condenser by a fan as the traditional way to remove heat from a refrigerator or freezer. Air cooled systems are the most economical and easiest to install. All Isotherm Compact Systems come complete and pre-charged. Each system is rated to refrigerate or freeze a specific volume so there's no guessing for what will work best for your boat! Systems range from 2 to 21 cubic feet. Installation is easy: simply mount the evaporator high in the box, connect the pre-charged plate and compressor, and connect power. Converting your old ice box into a modern refrigerator has never easier. Ventilation is the key to good refrigeration: It is important that the compressor compartment is well ventilated allowing cool air to enter from below and warm air to escape at the top. Once installed, the age-old hassle of hauling ice will be over! Isotherm specializes in dependable, energy-efficient systems which are backed by the exclusive Isotherm 5-year warranty on all compressors so you'll have the confidence of knowing you have purchased the best!