Refrigeration craftsmen install, maintain, and service heating and air conditioning (HVAC) and refrigeration systems. Often, they are called upon to service boilers and chillers. Refers work in a variety of commercial, municipal, and retail settings, and are typically assigned a service vehicle and a specific set of customers. They may be called for emergency repairs and must be professional and courteous, even in difficult customer service situations. Refrigeration craftsmen must follow and maintain detailed reports outlining work performed.