Other types of work to be considered are those that require large volumes of air flow. Some types of work are just the opposite. Acquisition cost of mechanical refrigeration is usually about 3 times that of evaporative cooling for a similar structure. Costs vary widely due to type of structure, climate and other factors. Upkeep and maintenance costs are somewhat lower with evaporative cooling partially due to the technical expertise required.
Operating costs are usually much higher for mechanical refrigeration.
Sometimes 3 to 5 times higher in energy use alone. Equipment selection must consider the ability of the structure to support it. It is not too unusual to have to locate equipment on the ground or some other mounting method because the roof will not support it's weight. Structural integrity is a serious consideration in selection and location of equipment. The climate is a major consideration in the selection of cooling equipment.