Diploma of Air Conditioning and Refrigeration Engineering

The Diploma of Air Conditioning and Refrigeration Engineering is a two-year qualification delivered by the Australia Institute of Business and Technology. It sits at the diploma level on the Australian Qualifications Framework, which puts it between a certificate IV and an associate degree. The course is built around the trade and engineering side of climate control: how refrigeration cycles work, how to select and size equipment, how to read and draw system schematics, how to commission plant, and how to diagnose faults in split systems, chillers, cool rooms and large commercial air handling units.

How the course is structured

Australian diplomas are made up of units of study, each carrying a set number of credit points. You enrol in a sequence of units across semesters or trimesters, and you need to pass the required units to graduate. The exact unit list, credit point values and semester-by-semester sequence are set by the institute, so check the official course page for the current structure. What you can expect is a mix of theory subjects, thermodynamics, electrical principles, refrigerant handling, building codes and control systems, and practical workshop or simulated-site units where you actually braze pipework, wire control circuits, evacuate and charge a system, and test it under load.

Skills you build

By the end you should be able to interpret mechanical drawings and wiring diagrams, calculate heat loads, select compressors, condensers and evaporators, set up and adjust controls, follow safe refrigerant handling and recovery procedures, and write up service reports that another technician can act on. You also pick up the workplace habits that matter on Australian sites: isolation and tag-out, working at heights, electrical safety, and the paperwork that keeps a job compliant. Some units may involve a work placement or simulated workplace tasks, but the amount and format vary, confirm this with the institute.

Who it suits

This diploma suits people who want a technical career in the refrigeration and air conditioning trades or in building services. It works for school leavers who like hands-on problem solving, for electricians or plumbers looking to add refrigeration skills, and for international students who want an Australian qualification in a field that keeps buildings, food storage and data centres running. If you are an international student, you can work up to 48 hours per fortnight while your course is in session, and after graduating you may be eligible for the Temporary Graduate visa (subclass 485) post-study work stream, subject to the Department of Home Affairs rules. English proficiency is required for entry; the institute accepts IELTS Academic and equivalent tests such as TOEFL iBT, PTE Academic and Cambridge C1 Advanced. Tuition is published on the CRICOS register. Always confirm fees, intake dates and unit details on the official page before you apply.

• Air conditioning and refrigeration technician
• Refrigeration mechanic
• Building services technician
• Commissioning assistant
• Maintenance technician for commercial buildings, supermarkets, cold storage and data centres
• Service and installation technician for HVAC contractors
• Technical sales or parts support for refrigeration equipment suppliers

Employers include HVAC contracting firms, facilities management companies, food processing and cold chain operators, supermarkets, hospitals, hotels, and mining or remote-site operations. Some graduates continue into higher qualifications or seek trade licensing or registration, which is handled by state and territory regulators.