Brooklyn was a chill place to be more than 100 years ago.

That’s when modern air-conditioning got its start in a publishing plant at Metropolitan and Morgan Avenue in East Williamsburg, Brooklyn. This was a  first, not just for Brooklyn but for the nation and the world.

A young Cornell graduate, Willis Carrier, installed the first modern AC system in 1902, although human comfort was not the primary goal in the Sackett & Wilhelms Lithographing and Publishing Company plant.

Instead, the mission was to not just control the temperature but also put a lid on the humidity, which bedeviled the paper dimensions and ink alignment that printers used.

Movie theaters soon began buying Carrier’s invention and advertised AC to draw in patrons, who relished cool air as much as their movies. Wealthy people also bought AC systems, but air-conditioning remained out of the reach of middle-class people for decades.

Other inventors had tried various methods to provide air conditioning, but none took off until Carrier’s system, which was made possible by the development of electricity.

Carrier, who developed the AC system while working for the Buffalo Forge Co., went on to co-found the Carrier Air Conditioning Company of America, which at one time employed nearly 60,000 people.

And it all began with sticky paper in Brooklyn.

Premier HVAC is owned by Brooklyn residents.