When the sweat starts to trickle and it’s muggy, just remember—as you turn the AC down—someone’s always watching, monitoring your comfort in every office and classroom across campus. They are men of the chill. Unseen and rarely thought about, they are unsung heroes who work quietly behind the scenes, braving rooftops with their toolbelts, crawling in hot spaces, answering the call and responding to complaints. “We deal with professors and office people all the time. We might lose...