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.
How Long it Takes for HVAC Certification. HVAC technicians repair and install air conditioning and heating units in homes and offices. Heating, air conditioning and ventilation -- or HVAC -- technicians are in demand. The Bureau of Labor Statistics estimates that jobs for HVAC technicians will grow 34 percent by 2020, which is much faster than average than other industries.