Technical Surveyor - HVAC Systems (AHU Upgrades & Optimisation) Location: Hybrid - Site / Mobile + Home / Office (Hampshire) We are recruiting for a leading UK ventilation and air-handling manufacturer based in Hampshire. They design, build and service high-performance Air Handling Units (AHUs) and energy-efficient HVAC solutions for commercial, industrial and public-sector environments. Role Summary Our client is seeking a versatile Technical Engineer to support upgrades and optimisation across their HVAC systems portfolio. This includes hands-on work upgrading Air Handling Units (AHUs) to Electronically Commutated (EC) fans, and improving Chilled Water (CHW), Low-Pressure Hot Water (LPHW), Direct Expansion (DX) and run-around coil systems. You'll take airflow and pressure measurements, troubleshoot issues on-site, and convert solutions into clear CAD drawings and documentation for installation teams. The role combines practical engineering, system validation and energy-efficiency improvements. Key Responsibilities * Support AHU upgrades, including EC fan conversions * Optimise CHW, LPHW, DX and run-around coil systems * Measure and analyse airflows and pressures to validate performance * Produce accurate CAD drawings and technical documentation * Troubleshoot HVAC issues and assist site teams * Collaborate with internal engineers, operations and external contractors * Contribute to energy-efficient system...