Amiga runs Michigan schools' heating and air conditioning systems (2015)
> Hopkins said the system runs on a radio frequency that sends a signal to school buildings, which reply within a matter of seconds with the status of each building.<p>I suspect this is what would be difficult to replace. A bespoke wireless sensor monitoring and communications system, integrated into an old heating/cooling system. Modern system just would not integrate into this, without a lot of work. You would have to replace everything, probably including the actual heating/cooling systems themselves.