Air Conditioning Engineer

Sigma Retail Group; Castleford; On-site; GBP 36,000 - 48,000; Full time

Benefits offered by this job

Birthday leave

Hybrid working

Cycle to Work

Health shield

Job summary

Sigma Group in the UK is seeking an experienced Air Conditioning Engineer to join our Mechanical & Electrical team in Castleford, with nationwide travel. You will install, service, fault‑find and commission air conditioning and heat pump systems across commercial and live retail environments, working to high safety and quality standards.

The role requires strong technical capability, independent work ethic and excellent communication as you partner with project teams, clients and suppliers

Qualifications

• Proven experience installing, servicing and fault‑finding commercial air conditioning and heat pump systems.
• Experience with Mitsubishi Electric and Daikin equipment.
• Knowledge of refrigeration pipework, brazing, pressure testing, evacuation, charging, recovery and leak detection.
• Experience commissioning VRF/VRV systems and using manufacturer diagnostic tools.
• Ability to interpret technical drawings, wiring diagrams, specifications and fault codes.
• Understanding of construction health and safety requirements, permits, RAMS and safe isolation procedures.
• Experience completing technical reports and service documentation accurately.
• Ability to work independently and manage workload.

Responsibilities

• Install, replace and commission split, multi‑split, VRF/VRV, packaged air conditioning and air source heat pump systems.
• Carry out planned preventative maintenance and reactive repairs on commercial air conditioning equipment.
• Diagnose and repair mechanical, refrigeration, electrical and control system faults.
• Complete brazing, pressure testing, evacuation, refrigerant charging, recovery and leak detection activities.
• Commission systems in accordance with manufacturer requirements and project specifications.
• Complete service reports, commissioning records, F‑Gas documentation and photographic records accurately and on time.
• Ensure all work is carried out in accordance with health and safety legislation, company procedures, RAMS and client requirements.
• Coordinate with project teams, clients, suppliers and subcontractors to ensure efficient project delivery.
• Support client demonstrations and provide clear operational guidance during handover.
• Identify and communicate technical issues, variations and additional works promptly.
• Maintain high standards of housekeeping, customer service and professionalism in live operational environments.

Skills

Fault finding

Communication

Safety compliance

Planning & organisation

Attention to detail

Independent work

Customer-facing

National travel

Continuous learning

Education

F‑Gas Cat 1

Level 2/3 in Refrigeration & AC

CSCS or ECS

Full UK Driving Licence

Electrical BS7671 awareness

Manufacturer training/AC commissioning

Brazing qualification

IPAF/PASMA/First Aid

Tools

Mitsubishi Electric equipment

Daikin equipment

Diagnostic tools

VRF/VRV systems

Job description

Posted 25 Aug 2026

Description

WE ARE LOOKING FOR A

AIR CONDITIONING ENGINEER

Number of Roles: 1 | Division: Building Services | Location: Castleford with nationwide travel

Sigma are experts at transforming commercial space. With over 20 years’ experience operating in the fast-paced and dynamic retail sector, Sigma provide a true end-to-end service; from store construction and consolidation to fixture procurement, projects, and mechanical & electrical installation.

Ranked in the top 10% of the 2019 Sunday Times International FastTrack 200 awards, we’ve been acknowledged as being one of Britain’s fastest growing private companies.

It’s our people that make us who we are, and we are proud to have some of the most experienced, knowledgeable, passionate, and dedicated individuals within our industry, at every level in our business. Sigma is committed to creating a diverse environment and is proud to be an equal opportunities employer. our business.

Outline of role

We are looking for an experienced Air Conditioning Engineer to join our Mechanical & Electrical team. Reporting to the Air Conditioning Project Manager, you will be responsible for the installation, servicing, maintenance, fault-finding, commissioning and decommissioning of air conditioning and heat pump systems across commercial and live retail environments nationwide.

This is a hands‑on role requiring a strong technical background, excellent problem‑solving skills and a commitment to delivering high‑quality work safely and efficiently. You will work closely with project teams, clients, suppliers and other trades to ensure projects are completed to the highest standards from initial installation through to final handover.

Main responsibilities

• Install, replace and commission split, multi‑split, VRF/VRV, packaged air conditioning and air source heat pump systems.
• Carry out planned preventative maintenance and reactive repairs on commercial air conditioning equipment.
• Diagnose and repair mechanical, refrigeration, electrical and control system faults.
• Complete brazing, pressure testing, evacuation, refrigerant charging, recovery and leak detection activities.
• Commission systems in accordance with manufacturer requirements and project specifications.
• Complete service reports, commissioning records, F‑Gas documentation and photographic records accurately and on time.
• Ensure all work is carried out in accordance with health and safety legislation, company procedures, RAMS and client requirements.
• Coordinate with project teams, clients, suppliers and subcontractors to ensure efficient project delivery.
• Support client demonstrations and provide clear operational guidance during handover.
• Identify and communicate technical issues, variations and additional works promptly.
• Maintain high standards of housekeeping, customer service and professionalism in live operational environments.

Knowledge and experience required

• Proven experience installing, servicing and fault‑finding commercial air conditioning and heat pump systems.
• Experience working with Mitsubishi Electric and Daikin equipment.
• Strong knowledge of refrigeration pipework, brazing, pressure testing, evacuation, charging, recovery and leak detection.
• Experience commissioning VRF/VRV systems and using manufacturer diagnostic tools.
• Ability to interpret technical drawings, wiring diagrams, specifications and fault codes.
• Understanding of construction health and safety requirements, permits, RAMS and safe isolation procedures.
• Experience completing technical reports and service documentation accurately.
• Ability to work independently and manage workload effectively.
• Experience within live retail, hospitality, education or other business‑critical environments would be advantageous.
• Experience with Toshiba, Panasonic, Trane, Carrier, Lennox, Clade, EcoAirbox or similar systems would be beneficial.

Skills required

• Strong fault‑finding and diagnostic skills.
• Excellent communication and customer service skills.
• Ability to work safely and methodically under pressure.
• Effective planning, organisation and time management.
• Strong attention to detail and commitment to quality workmanship.
• Ability to work independently and as part of a wider project team.
• Professional approach when working in customer‑facing and occupied environments.
• Flexibility to travel nationally and work occasional nights or weekends as required.
• Commitment to continuous learning and maintaining technical competence.

Qualifications

• Current F‑Gas Category 1 qualification (or current equivalent recognised certification).
• Relevant Level 2 or Level 3 qualification, apprenticeship or proven occupational competence in Refrigeration and Air Conditioning.
• Valid CSCS or ECS card.
• Full UK Driving Licence.
• Electrical qualification with BS7671 awareness.
• Manufacturer training or commissioning accreditation for commercial AC/VRF systems.
• Recognised brazing qualification or competency assessment.
• IPAF, PASMA, First Aid, Manual Handling and UKATA Asbestos Awareness training.
• Training relating to A2L or flammable refrigerants.
• A day’s ‘birthday leave’ to be taken within your birthday month
• Opportunity to buy or sell up to 3 days holiday*
• Opportunity for hybrid working*
• Ability to participate in the Octopus EV salary sacrifice scheme*
• Ability to participate in the Cycle to Work Scheme*
• Employee Assistance Programme
• Healthshield cash plan with discounts on high street stores
• Free external financial advice – offering support for mortgages, pensions and insurances
• Enhanced family friendly pay*
• Free tea, coffee and fruit on all sites

*Subject to eligibility

Opportunity to be involved with

• Group Colleague Board
• Quarterly Corporate Events/Charity Involvement

Sigma is committed to providing colleagues with opportunities to progress their career, supported by a range of training and development activities and interventions’

If you think you’ve got what it takes to join our growing, winning team we’d love you to hear from you.

Company Overview

Established more than two decades ago, Sigma Group has delivered thousands of new and refurbished spaces for major brands, both domestic and international. Today, we support full, multi‑site transformations with in‑house capability, thanks to our expert‑led teams servicing the UK and beyond.