HVAC Apprentice Year 1: Course D; This is one of four 8-week courses that comprise the Year 2 HVAC Apprentice training. This is offered by Hyflex for large groups and Online for smaller groups. Year 2 of the HVAC Apprentice training covers appliance Installation, 24 hours, Intro to Blueprints & Specifications, 24 hours, Basic Electricity, 60 hours, Indoor Air Quality, 15 hours, and Residential Load Calculations, 33 hours.