We are currently recruiting for an experienced Air Conditioning Engineer to join a leading facilities management provider working on a long-term public sector contract. This is a mobile field-based role covering South London, responsible for the servicing, installation, commissioning, and reactive fault-finding of commercial HVAC systems across multiple sites. You will be joining a high-performing engineering team delivering essential maintenance services on a large-scale, SLA-driven contract. Key Responsibilities Service, maintain, and fault-find commercial HVAC systems Carry out commissioning and installation of HVAC equipment Work on chillers, air handling units (AHUs), and associated systems Respond to reactive breakdowns and emergency callouts Carry out planned preventative maintenance (PPM) tasks Produce accurate reports, job sheets, and compliance documentation Ensure all works meet HandS standards, RAMS, and site procedures Liaise with contract teams and site stakeholders Support warranty and remedial works when required Candidate Requirements Essential Strong background in HVAC / Air Conditioning service engineering Experience with fault finding and reactive maintenance Ability to work across commercial building services environments F-Gas certification Full UK driving licence Highly Desirable Experience with chillers, AHUs, VRF/VRV systems Background in FM or building services contracts Experience working on SLA-driven or public sector contracts Strong reporti