In a cooling system, undersized ducts can cause:

In a cooling system, undersized ducts can cause:

• A. Reduced airflow and inefficient operation
• B. Excessive refrigerant charge
• C. Higher humidity
• D. Lower compressor efficiency

Answer: (A)

When ducts are too small, the air face more resistance as it moves through the system. That means less air can be pushed across the evaporator coil, so the system delivers a smaller volume of cooled air to the space. With reduced airflow, the coil has less heat to absorb, heat transfer is limited, and the space doesn’t cool efficiently. To compensate, the system runs longer or harder, wasting energy and making operation inefficient. Other potential outcomes like an excessive refrigerant charge, higher humidity, or lower compressor efficiency aren’t primarily caused by undersized ducts. Refrigerant charge issues relate to the amount of refrigerant, and humidity and compressor efficiency are influenced more by refrigerant conditions and overall load rather than duct size.

When ducts are too small, the air face more resistance as it moves through the system. That means less air can be pushed across the evaporator coil, so the system delivers a smaller volume of cooled air to the space. With reduced airflow, the coil has less heat to absorb, heat transfer is limited, and the space doesn’t cool efficiently. To compensate, the system runs longer or harder, wasting energy and making operation inefficient.

Other potential outcomes like an excessive refrigerant charge, higher humidity, or lower compressor efficiency aren’t primarily caused by undersized ducts. Refrigerant charge issues relate to the amount of refrigerant, and humidity and compressor efficiency are influenced more by refrigerant conditions and overall load rather than duct size.