HVAC Design Engineer in Sunbury-on-Thames

Johnson Controls, a global leader in thermal management, mission‑critical building systems, energy efficiency, and decarbonization, helps customers use energy more productively, reduce carbon emissions, and operate with the precision and resilience required in rapidly expanding industries such as data centers, healthcare, pharmaceuticals, advanced manufacturing, and higher education. For more than 140 years, Johnson Controls has delivered performance where it really matters.

The role will be working in the Global Marine & Navy Service Team designing bespoke HVAC/R systems for military vessels for Navies worldwide. You will assist project managers, design retrofit solutions (including calculations and drawings), and perform refrigeration and obsolescence studies to ensure reliable, cost‑effective products and solutions.

What we can offer:

• Competitive salary
• Remote working
• 25 days paid holiday + Bank Holidays and sick pay
• Comprehensive benefits package including 7% match pension, free life assurance, employee assistance program, employee referral scheme, employee discounts including high street brands, cycle 2 work scheme and discount on Johnson Controls security products
• Extensive product and on‑the‑job/cross training opportunities with outstanding resources available
• Encouraging and collaborative ethos
• Career development through various career ladders
• Access to business resource groups and training on things we value

How you will do it:

• Understand and interpret client HVAC specifications, retrofit scopes, and commercial documentation to drive design decisions
• Organise deliverable packages for retrofit projects, including calculations, drawings, specifications, and reports
• Produce technical and obsolescence documents and studies to support lifecycle management
• Develop technical proposals for HVAC enquiries, including retrofit options and energy‑saving strategies
• Manage projects from concept and detailed design through installation and commissioning support, coordinating with PMs and cross‑functional teams
• Perform design calculations (load calculations, duct/piping sizing, thermal analysis) and create CAD/3D drawings
• Write detailed system specifications, prepare test procedures, and compile technical reports (including obsolescence and risk analyses)
• Provide technical reviews of OEM designs to ensure compliance with client requirements before manufacture
• Coordinate with procurement to obtain supplier quotes and manage equipment procurement for retrofits
• Maintain daily consultation with service teams and manage interfaces with cross‑functional groups
• Track project progress and financials; develop progress reports and manage cost control for the design scope

What we look for:

Essential:

• Experience in Design (HVAC / Mechanical / Electrical)
• Excellent communication skills – Consulting directly with the client and internal service team
• Experience in interpreting clients’ technical specifications
• Understanding of refrigeration and air conditioning systems, fluid dynamics and heat transfer
• Good working knowledge of Microsoft Office packages
• Proficient in AutoCAD 2D & 3D
• Full UK Driving License
• SC UK MOD Security clearance required, screening provided by JCI

Preferred:

• Engineering Qualification (HVAC / Mechanical / Electrical)
• HNC/HND in Engineering (Engineering Background)
• Experience in the Marine Industry
• Experience with MoD contracts
• Experience in HVAC/Chilled Water Plant Industry – HVAC Role
• 3+ years in similar position

Due to the nature of this position, we are only able to consider applicants who currently have the unrestricted legal right to live and work in the UK. We are unable to provide sponsorship or assist with visa applications for this role.