"When interviewing for a HVAC technician role, expect to be quizzed on your knowledge of how HVAC systems function and are installed. Employers are looking for candidates with experience as a technician or apprentice that can perform well in difficult conditions. Come ready to discuss your ability to succeed under pressure as well as in uncomfortable environments, such as overly hot, cold, or cramped spaced. If you plan to work with refrigerants, make sure you've earned your EPA certification."
What is the difference between R22 and R410a?
R410a is blended and R22 is not.