HVAC Vs. AC Mechanic: Difference And Similarities The distinction between HVAC and air conditioning mechanics is one of the most confusing topics among students. While there are differences between the two, there needs to be awareness. Contractors and builders often need clarification on the two mechanics. There is a difference between them. And an automotive repair program helps in learning the difference between the two. If you wish to become an HVAC mechanic, an automotive repair program can help you the best.