content: $30 * 19 = $570 if you put a Pi in each building. On the other hand, you'd also be saving at least ~$20 /month for the phone line (or quite a bit more if they're using multiple dedicated commercial lines) and opening up the maintenance radio channel. The Pis would probably save quite a bit in electricity too.  The district hopes to replace the old Amiga with a modern environmental control system soon if an upcoming bond measure is passed by voters. It’ll cost about $1.5 to 2 million to replace the Amiga  Holy crap! I hope that price tag includes new high-efficiency furnaces and AC units.