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HVAC Level One Chapter 1 Questions and Answers | Latest Version | 2025/2026 | Correct & Verified What is a split system in HVAC? An air conditioning system with separate indoor and outdoor units. What is a packaged system? An HVAC system that combines all components in a single outdoor unit. What is the function of an expansion valve? To control the flow of refrigerant into the evaporator. Why is proper refrigerant charge important? To ensure system efficiency and prevent damag...