HVAC is a perfect example of converting knowledge and skills into income.  But there is so much out there to learn.  How would one know what knowledge and skills are beneficial?  The challenge is to obtain the right training in a meaningful path, rather than just more training in no particular order.  After all, formal education is based on structured learning rather than random learning.  Trevor Matthews from Emerson tells us about effective training paths HVAC mechanics can take to maximize time and effort.