Refrigeration and Air-conditioning Technicians install, service and maintain refrigeration and air-conditioning systems. Other related jobs are Mechanical engineers, Electrical engineers, Electrical engineering technicians etc. 

In New Zealand this field typically involves:

• advise clients on different refrigeration/air-conditioning systems
• install refrigeration/air-conditioning systems
• test, adjust and balance systems to make sure they work properly
• check refrigeration/air-conditioning systems for faults and repair them
• manage and supervise less experienced refrigeration/air-conditioning colleagues.