Big manufacturing that needs to have a vast quantity of cooling, does two more things besides A/C. 1 - They use evaporative cooling against the A/C radiators. 2 - They sometimes heat the A/C radiators so hot that they boil water, which they set the radiator coils within. --- Imagine blasting a mist of water against the heat radiators in your home A/C. --- Check here https://duckduckgo.com/?q=dual+AC%2Fevaporative+systems&ia=web and here https://www.evapoler.com/product-category/indirect-evaporative-air-cooling-two-stage-cooling/ : "According to the American Society of Heating and Engineers (ASHRAE), two-stage evaporative coolers use 60%-75% less electricity than conventional refrigerant-based AC systems."