Every vendor who walks into your plant room runs the same pitch: your system is legacy, it’s time to swap it out. The next box solves everything. Funnily enough, the next box is always the one they sell.
The technical truth is less profitable for them: the data is already there. Your controllers already speak BACnet, Modbus, MQTT. You’re not short of hardware. You’re not short of sensors. What you’re short of is someone reading what the building is already telling you. The problem isn’t silence. It’s deafness.
Where it actually hurts — the bit the slides skip over: segmented networks, BBMD crossing subnets, NAT, hostile VLANs, point names with no documentation, "open protocols" with vendor lock-in quietly underneath. We’ve walked into portfolios of hundreds of buildings without a single network diagram. Reading BACnet in a lab is trivial. Reading BACnet across a real, live, undocumented estate is the actual job.
Which is why rip-and-replace is, almost always, the wrong default. It’s expensive, it takes the building offline, and it throws away the institutional knowledge embedded in controllers that have been working there for years. You don’t need to swap out the building’s nervous system. You need to give it a brain.
Integrate instead of replace: read and write across the protocols you already have, and put the intelligence layer on top. One day per building to install a gateway, not 18 months to rip out controls that work.
To be straight: sometimes the kit really is dead, or it’s proprietary and locked, and there’s a piece you genuinely have to swap. When that’s true, we tell you. But it’s the exception, not the rule. Be wary of anyone who tells you it’s always the rule.
Your BMS isn’t old. It’s quiet. The right question isn’t "which new system do I buy?". It’s "why is nobody talking to the one I already have?".