HVAC Design Manager

johnson controls (s) pte. ltd.; Singapore; On-site; SGD 90,000 - 140,000; Full time

Job summary

Johnson Controls Singapore is seeking an experienced Mechanical Engineer to manage HVAC projects from planning through execution.

You will lead medium-complexity projects, coordinate with sales, customers and contractors, and ensure profitable, compliant delivery.

Ideal candidate holds a Mechanical Engineering degree with 7–10 years of HVAC design experience and proficiency in Revit and AutoCAD, plus ASHRAE/ISO knowledge.

Qualifications

• Degree in Mechanical Engineering or related field required.
• 7–10 years in HVAC system design including chilled water or condenser systems.
• Strong HVAC fundamentals and controls integration.
• Proficiency in Revit and AutoCAD.
• Experience with ASHRAE, ISO, and local mechanical codes.
• Experience delivering mid-scale commercial or industrial projects.
• SCEM or LEED AP is a plus.

Responsibilities

• Manage assigned project(s) within HVAC portfolio; plan, execute and complete medium complexity projects.
• Coordinate communication with sales, customer and contractors to ensure alignment and updates.
• Develop and review detailed engineering drawings, schematics, and equipment specifications.
• Perform HVAC load calculations, hydraulic calculations, pump head calculations, pipe sizing and system design.
• Prepare proposals, BOM, equipment selections, and tender documentation.
• Ensure all designs comply with ASHRAE standards, ISO codes and corporate guidelines.
• Coordinate with internal teams to support pre-sales and project execution.
• Review and validate engineering designs from consultants, contractors, and partners.
• Provide technical mentorship to junior engineers.
• Conduct site assessments, attend technical meetings and support reviews.
• Support troubleshooting and commissioning activities for HVAC and hydronic systems.
• Meet with clients and design teams to determine mechanical applications and requirements.
• Review mechanical designs using CAD, CAM, and 3D CAD programs.

Skills

Communication skills

Team coordination

Education

Bachelor’s degree in Mechanical Engineering or related field

Tools

Revit

AutoCAD

Job description

What you will do:

Manage assigned project(s) within HVAC portfolio. Serve as project manager who plan, execute and complete the medium complexity of project. Coordinate communication with sales, customer and contractors. Ensuring profitable execution, project integrity and customer satisfactions.

How you will do it:

• Develop and review detailed engineering drawings, schematics, and equipment specifications.
• Perform HVAC load calculations, hydraulic calculations, pump head calculations, pipe sizing, and chilled water/condensate water system design.
• Prepare technical proposals, bill of materials (BOM), equipment selections, and tender documentation.
• Ensure all HVAC designs comply with ASHRAE standards, local building codes, and corporate engineering guidelines.
• Coordinate with internal teams (sales, project management, solutions engineering) to support pre-sales and project execution.
• Review and validate engineering designs from consultants, contractors, and partners.
• Provide technical mentorship and guidance to junior engineers.
• Conduct site assessments, attend technical meetings, and support design reviews.
• Support troubleshooting and commissioning activities related to HVAC and hydronic systems.
• Meeting with clients and design teams to determine mechanical applications and requirements.
• Review and understand mechanical designs using CAD, CAM, and 3D CAD programs.

What we look for:

• Bachelor’s degree in Mechanical Engineering or related field.
• Minimum 7 - 10 years experience in HVAC system design, including chilled water systems or condenser system design.
• Strong understanding of HVAC system fundamentals, equipment selection, and controls integration.
• Hands-on proficiency in HVAC design software (Revit, AutoCAD).
• Familiarity with performing hydraulic calculations and using tools/spreadsheets for pump head computation.
• Knowledge of relevant standards (ASHRAE, ISO, local mechanical codes).
• Experience delivering medium-scale commercial or industrial projects.
• Strong documentation, communication, and coordination skills.
• Professional certification (SCEM, LEED AP) is an advantage.