Portable cooling has been around since the 1980s, as the guys at Spot Coolers tell it, and among the first customers for the equipment in the U.S. were professional football teams.
Uses in this country have spread far and wide since then, creating comfort for people at home or at work (albeit usually not in front of a national television audience). Contractors who understand some of the less obvious applications so far might find an opportunity to make a valuable recommendation to a customer at some point down the road.