Quoted from d0n:thanks! the heat is something I've been struggling with for a few years.
I think ultimately, one more 24,000 BTU mini split system would fix this but we don't have 30amps of power for it since all of our 50 games are maxing out our current electrical system.
I'm always surprised at how much heat the neon lights create. Many of the power supplies get so hot you can't touch them for long. Also, fluorescent light ballasts get extremely hot. We had ten, 8 foot long, double bulb fluorescent fixtures (80 feet in total, 40 feet on each side of the ceiling) that we had swapped out to LEDs in an effort to keep the room temp down. Each of the 10 fixtures has a brick sized ballast that literally got so hot you could not touch it. Imagine how much heat 10 ultra hot "bricks" put out?! Changing to LEDs eliminated the ballasts which helped a lot.
I can't find the post now but somewhere (Possibly another forum) there was a discussion of the Pinball Hall Of Fame in Vegas (at least I think it was them) swapping over to LEDs in the games and how much of an impact that had on current draw per game and in building cooling. Not sure if you've changed the games over or not but at 50 games it would effect your current load, heat, and wallet probably equally.