Three solutions that complete a building's value.
Mechanical design, automation control, VE
YJ System is a mechanical engineering firm specialising in AHU design and supply, BAS/DDC automation control, and VE consulting. From data centres, hospitals, cleanrooms and industrial facilities to special air conditioning, we deliver systems whose performance is verified long after handover, thanks to precision design.
A firm built around the engineer.
YJ System Co., Ltd. is an HVAC-specialized engineering consulting company encompassing mechanical equipment design and automation control. Areas that cannot be solved with standard air conditioners — 100% outdoor air conditioning, desiccant dehumidification, constant temperature and humidity, ultra-low dew point environments — are our areas of expertise.
Design is completed through control. The designer directly performs BAS/DDC control logic, system diagrams, and point lists to create a system where the design intent is implemented exactly up to the operation stage. Added to this are VE (Value Engineering) and LCC analysis to present the optimal balance point between initial investment and operating costs.
Data centers, hospitals, cleanrooms, industrial facilities — in spaces where air conditions are performance, YJ System provides verifiable answers.
What we stand for.
Integrity first
Independent recommendations grounded in evidence, never influenced by supplier relationships.
Chartered standards
Every project is led by a chartered mechanical engineer accountable from concept to handover.
Client partnership
We embed with your team, transfer knowledge, and leave you stronger than we found you.
Global delivery
Three offices, regional partners on six continents, single-team accountability.