Engineroom heat doesn't just affect engines, it also damages generators, cooling, and electrical systems. But solutions are simple. "If you're not getting enough air in, you won't get enough out, and temperatures are going higher," says Michael Murray, owner of Livos Technologies (www.livostech.com). His company, named for the Greek god of the favorable southwest wind, first looks for places to draw in more air-typically cockpit bulkheads, cabin sides, or even flying bridges. But more often than not, Murray relies on high-capacity axial fans, typically four per boat. "Two intake fans insert both combustion air and cooling air, while smaller exhaust fans pull out cooling air only," Murray says. "We control intake fans automatically, by sensing engineroom depression, and we control exhaust fans by temperature. As the engineroom heats up, the exhaust fans ramp up, and the resulting depression ramps up the intake fans."