1 The way your foot is shaped puts too much pressure on your big toe joint. Because bunions can run in families, some experts believe that the inherited shape of the foot makes some people more likely to get them.  Your foot rolls inward too much when you walk. A moderate amount of inward roll, or pronation, is normal.
Step 3: Route 2: Earn a Certificate or Degree. Enroll in an HVAC certificate or associate's degree program at a community college, trade school or technical academy. The programs can take between six months and two years to complete.
Step 5: Obtain a License. Depending on the locality or state where you live, you may need a license to work as an HVAC technician. Licensing requirements vary, but typically include passing an exam and either completing a training program or accumulating 2-5 years of work experience.