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Question 1: In HVAC system design, how does a manual J calculation differ from a manual D calculation?

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Question 2: What should an HVAC technician check first when an air handling unit (AHU) is not blowing air as expected?

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Question 3: What is the likely issue when the HVAC system's evaporator coil is not freezing?

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Question 4: What is the primary cause of a humming sound but no cooling or heating from the HVAC system?

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Question 5: How do high-efficiency filters contribute to energy efficiency in HVAC systems?

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Question 6: What is the role of variable refrigerant flow (VRF) systems in energy-efficient HVAC design?

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