BEMServer vs Daikin Applied Building Management System

BEMServer is an open-source platform for deploying a modular building energy management system. It gathers information from building management systems and sensors alongside weather, occupant feedback, building descriptions, and contextual data. The platform connects building hardware with data-oriented services, storing building models, time series, and events for access through documented REST APIs. Its data model follows IFC and Haystack standards. Processing modules interpret collected information to identify issues or inefficient operation and support recommendations and decisions. Listed modules cover fault detection and diagnosis, renewable energy simulation, energy management, load forecasting, indoor environmental quality, and visualization. The software is licensed under AGPL-3.0, and sellers using a modified version must publish their modifications under that license. There is no software license fee, although installation, configuration, maintenance, and selected modules may be paid services. The maker recommends help from someone with Python and Docker knowledge and says installation was tested on Debian 9. BEMServer currently supports building monitoring; other uses require extending its functionality.

Daikin Applied Building Management System is a paid, open control platform for building mechanical systems, with Android, iOS, and web access. It is designed for new BMS installations, legacy-control upgrades, and rooftop-unit fleets across multiple sites. Operators receive real-time alerts and insights, monitor systems remotely, and submit service requests. Lifecycle analytics are described as supporting equipment life, operating-cost performance, and HVAC service contracts. The system integrates with Daikin and third-party equipment through BACnet, Lonworks, Modbus, digital and analog I/O, and legacy communication protocols. Its scale runs from unit-level control to enterprise-wide monitoring. Controls use modular components, color-coded removable terminals, universal I/O across models, and an onboard Hand-Off-Auto display for local access. Daikin names retail, schools, and commercial applications as target settings. Local service offices design, install, and maintain turnkey controls and handle availability. Daikin describes the ecosystem as secure but gives no specific controls or certifications. Pricing is available on request.