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A metal building can be 15 to 25 degrees hotter than the outside air by midafternoon, even before you add people, machinery, lighting, or process heat. If you are figuring out how to cool a metal building, the real issue is not just temperature. It is solar gain, radiant heat, trapped hot air, air change rate, and whether the building can move enough air to match the load. That is why many buildings stay hot even after the owner installs a few fans. Air movement helps occupants feel cooler, but …