They probably loaded the levy request with a bunch semi-related equipment upgrades on top of the central AC controller, kind of like how bills in Congress get t

They probably loaded the levy request with a bunch semi-related equipment upgrades on top of the central AC controller, kind of like how bills in Congress get tons of extra requests tacked on to the main request. Since they've been running the controller so long without significant changes, their HVAC systems are probably just as old if not older than the centralized controller that's already very obsolete.