I want to cool the air inside the cabin of a my boat but I don't have room to install even the smallest of air conditioners. I would like to build something like a swamp cooler (Evaporative Cooler) but without the evaporative part. I don't want to blow additional humidity around in the cabin. I can use a pump to get a never ending supply of cold lake water. I'm wondering if putting a fan in front of a radiator cooled with lake water will give me any sort of a reasonable deltaT on the air flowing through it? Basically using a radiator in reverse. Anyone have any thoughts on if this works? what kind of radiator to use? and if I can get any reasonable temp drop on the air going through the radiator?