Equipment
Building Automation System (BAS)
Definition
A computerized control system that monitors and manages a building's mechanical and electrical systems — HVAC, lighting, fire safety, access control, and more — from a central interface. Also called a Building Management System (BMS) or Building Control System.
Why It Matters for Your Business
A properly commissioned and optimized BAS can reduce building energy use by 20–30% through automated scheduling, setpoint optimization, fault detection, and demand limiting. It's the foundational technology for energy management in commercial buildings.
Frequently Asked Questions
What is the difference between a BAS and an EMS?
A BAS (Building Automation System) typically controls physical equipment via hardwired connections (valves, actuators, dampers). An EMS (Energy Management System) is software-focused, analyzing energy data and providing optimization recommendations. Modern systems often blur this distinction.
How much does a BAS cost?
BAS installation costs vary widely based on building size and complexity. Rough estimates: $2–$5 per sq ft for new construction; $5–$15 per sq ft for retrofit. ROI through energy savings is typically 2–5 years.