This class is offered int he Hyflex format, meaning the work can be accomplished online with the opportunity to attend weekly classes either in person or via Zoom. HVAC Apprentice Year 4: Course D; This is one of four 8-week courses that comprise the Year 4 HVAC Apprentice training. Year 4 of the HVAC Apprentice training covers Intro to Psychometrics, 12 hours, HVAC Control Strategies, 9 hours, Advanced AC & Heat Pump Systems, 42 hours, Advanced Service, 36 hours, System Integration & Design, 12 hours, Fuel Gas, Electrical & Mechanical Code Review, 48 hours, and Project Management 9 hours.