i was going to buy a shutter fan and another shutter for my greenhouse i am working on. probilbly 12" apiece. the green house is 12' by 12'. this would cost me about 200 for the fan with shuttle and 100 dollars for the other shutter. so my question is would it be "(easier, cheaper, etc) to just get a swamp cooler? please fill me in bc i dont know how i am going to cool this greenhouse.