The HVAC industry, formally termed the heating, ventilation, and cooling industry, is expanding rapidly. Since it began in its modern form with the invention of air conditioning, it has been widely embraced, even appearing in movie theaters during the Great Depression because of its high draw. By 1980, the U.S. was consuming more air conditioning than the entire rest of the world, though it has only 5% of the world’s population. Things started to heat up with the invention of the radiator, appropriately invented in chilly St. Petersburg by a Polish born businessman named Franz San Galli in the 1850s.…