HVAC (Heating, Ventilating and Air Conditioning) combines sheet metal and electrical work involving installation, wiring, service and repair of environmental control systems and the fabrication and installation of ductwork. 

An HVAC Technician might perform any of the following services:

Install, troubleshoot, repair, and maintain air conditioning, refrigeration, and heating equipment for residential, commercial and industrial applications. Follow blueprints or other specifications to install oil, gas, electric, solid-fuel, multiple fuel heating systems; motors compressors, condensing units, evaporators and piping. Connect electrical wiring and controls and check the heating or air conditioning unit for proper operation. Weld and connect supply lines, air ducts and vents, refrigeration piping and pumps. Interact with customers to answer questions, provide recommendations and invoice for services.

Work is done indoors and outdoors. Work spaces can range from outdoor scaffolding to crawl spaces inside a wall. 

Apprenticeship applicants must be at least 18 years of age. 

In addition, applicants must have a high school diploma or GED, or international equivalent and have completed one year of high school algebra, Integrated Math 2, or equivalent post-high school algebra course(s) with a grade of C or better, or equivalent math placement test scores.

Classroom Hours: A minimum of 144 hours per year for 4 years

On-the-Job Training: 8,000 hours (approx. 4 years)