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HVAC controls that let your buildings breathe

We audit, install, program and service the controls of heating, ventilation and air conditioning. For HVAC contractors, MEP consultants and building managers.

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Check your BACS obligation
Glass facade of an office building, crossed by airflow lines
Heating, ventilation, air conditioning: every flow set at the right time.
  • Since 2017
  • Based in Anderlecht
  • Brussels, Wallonia and Flanders

From audit to servicing, one point of contact

We follow an installation from start to finish. For HVAC contractors and MEP consultants who hand us the controls on their projects, and directly for building managers.

  1. Audit

    We record what is installed and what has drifted: schedules, setpoints, sensors, valves. You receive a clear report and a list of priorities.

  2. Installation

    Control panels, sensors, actuators, meters: we fit and wire the equipment, on our own or with your HVAC contractor.

  3. Programming

    Controllers and BMS supervision programmed, then commissioned point by point, with up-to-date documentation.

  4. Troubleshooting and servicing

    An alarm, a comfort complaint, a breakdown: we step in on site or remotely, then keep track of the installation over time.

The systems we program

A new installation or existing controls to take over: we work on the brands you find in your plant rooms and control panels.

Siemens Synco and Desigo ranges, Honeywell Trend. And the protocols that connect them: BACnet, Modbus, KNX, M-Bus.

Does the BACS regulation apply to your building?

Quick check, 3 questions

Where is the building?
Is the building mainly non-residential?

Offices, school, shop, hotel, public building: more than half of the floor area.

Heating or cooling output?

Shown on the rating plate of the boiler or the chiller.

Your result appears here after the third question.

Have Elyos check itIndicative, no commitment. Only a site visit can confirm it.

290 kW

Above this heating or cooling output, a non-residential building must have a building automation and control system (BACS). It tracks energy use and flags drift. Brussels, Wallonia and Flanders apply this threshold on different dates: the check gives you yours.

Thresholds, dates and sources by regionLast checked: 9 November 2026

Let’s talk about your building

A controls project, a fault, a question about BACS: write to us or leave a message and we will get back to you.

HVAC contractor or MEP consultant? Send your specification to info@elyos.be, with the points list if you have it.

Request a meeting

Email us at info@elyos.be: the building, the system in place and what you need. We will get back to you to arrange a meeting.

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