The lifespan of a new AC unit typically ranges from 15 to 20 years, depending on factors such as maintenance, usage, and environmental conditions. Regular maintenance, such as changing filters, cleaning coils, and scheduling annual inspections, can significantly extend the unit's life. Units operating in harsh climates or under heavy usage may have shorter lifespans. Ensuring proper installation and addressing repairs promptly also contribute to maximizing the lifespan of your new AC unit.