Which outcome occurs when an HVAC evaporator coil experiences significant frost buildup?

💡 Explanation

When frost builds upon an HVAC evaporator coil, thermal resistance increases due to insulation properties of the frost, thereby reducing heat transfer from the air to the refrigerant and diminishing the system's ability to cool effectively. Therefore cooling performance decreases and efficiency drops, rather than subcooling, overheating, or overcharge which entail issues elsewhere in refrigerent or compressor cycles.

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