We're Hiring: Mechanical Services HVAC Design Engineer
Location: Bordon / Sunbury-on-Thames / London – Hybrid working | Hours: Mon–Fri, 9am–5pm
About the Role
Join Johnson Controls as a Mechanical Services Design Engineer and help shape the future of sustainable infrastructure. You’ll design mechanical systems including ventilation, heating, air conditioning, chillers, and air source heat pumps—focusing on fluid designs for decarbonisation projects. Working with healthcare and local government clients, you’ll size ductwork and pipework, select plant equipment, and calculate building heat losses and gains using AC Calc software. Site surveys and client meetings are part of the role, along with producing technical submissions and ensuring compliance with industry standards.
What We Offer
1. Competitive salary
2. 25 days holiday + bank holidays + sick pay
3. 7% matched pension, free life assurance, employee assistance programme
4. Discounts on high street brands and Johnson Controls security products
5. Cycle-to-work scheme and referral incentives
6. Hybrid working and structured career development
7. Extensive training and a collaborative team culture
8. Commitment to safety through our Zero Harm policy
What You’ll Bring
9. Expertise in fluid designs, especially ASHPs, chillers, and decarbonisation systems
10. Experience conducting site surveys and preparing reports
11. Knowledge of CIBSE, BESA, and Water Regulations
12. Willingness to travel (1–2 site visits per week)
13. Strong communication skills and customer-facing experience
14. 10+ years in mechanical building services (ventilation, heating, domestic services, AC, chillers, ASHPs)
15. Proficiency in AutoCAD and technical submissions
16. Familiarity with NHS HTM specifications
17. Experience in healthcare and local government decarbonisation projects
18. Background in project-based environments with design-to-delivery handovers
A Specialist Division Within Johnson Controls
This role sits within a specialist team formed through Johnson Controls’ acquisition of H&C Contracts Ltd—an established provider of mechanical services for healthcare environments. Since joining JCI in 2019, the H&C team has continued to deliver high-performance solutions for critical spaces such as operating theatres, MRI suites, and pharmaceutical facilities. You’ll be part of a legacy of precision and innovation, backed by the global strength of Johnson Controls.
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