Why is lowering airflow in a HVAC system a problem?

HVAC systems are carefully designed and balanced complex heat-transferring machines. Heat exchangers are used to transfer the heat to the air in an HVAC system. To work properly, these heat exchangers are designed to operate with a minimum and a maximum airflow going through them. In the worst case heating scenarios, low airflow in a furnace can cause short cycling by tripping the high temperature safety switch. Low airflow through the cooling coil could cause it to ice up, resulting in cooling failures or, worse yet, flooding.

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