The first system that I built is running outside in open air I have started planning on making a larger system with a 110 gallon stock tank for the fish tank and thought about putting the system in a 10 x 12 greenhouse, but I am afraid that it will get too hot in the summer and trying to cool it will be too expensive.   My plan B is to put it in a 10 x 12 building with plastic clear roofing panel…