hoosing between residential and commercial HVAC is one of the first real decisions you face when starting a heating and cooling career. This guide from Philadelphia Technician Training Institute (PTTI) explains both paths in clear, student-friendly language. Residential HVAC technicians work in homes on furnaces, heat pumps, and split systems, dealing directly with homeowners. Commercial HVAC technicians work on rooftop units, chillers, boilers, and building automation controls inside offices, schools, hospitals, and retail buildings. The guide compares systems, work environments, schedules, and long-term growth on each side, and explains EPA Section 608 certification, Pennsylvania licensing rules, and the credentials employers look for. For high school students, career changers, and adult learners seeking an alternative to a four-year degree, HVAC is a practical way into the skilled trades. PTTI offers hands-on HVAC training in Philadelphia built around real lab work and job-ready tec
