I have a freezer that is 29ft long x 43 inches width and 8 ft height it is supposed to reach 0 or less degrees F beccause it is for ice cream . It had a three fan evaporator, but it is not working well it reaches only 18 degrees F. I think it is because the circulation of the air is not appropiate. The compressor is a hermetic Copeland 3 Hp, 404. I was thinking of placing two evaporators with just one fan facing each other on each end of the box. But I am not completely sure if it is going to work. Can you hep me with suggestions please.