If you're considering working in the HVAC field, you'll want to start with HVAC certification. These classes help you become familiar with the various operating systems of HVAC units. You will have to understand the functions of each unit, as well as science and math. A skilled HVAC technician will have excellent communication skills both in writing and verbally writing. They must also be able to work in tight spaces. For more information about HVAC Contractors visit https://www.examprep.org/contractors-license/seminars/tennessee/nate-training-and-certification/