Yes, low refrigerant (freon) is one of the primary mechanical causes of evaporator coils freezing. When a leak develops in the sealed copper tubing, the total volume and pressure of the refrigerant drop significantly. This drastic drop in pressure causes the boiling point of the remaining refrigerant to plummet, driving the surface temperature of the indoor evaporator coil well below the 32-degree Fahrenheit freezing mark. As warm household air passes over this super-cooled metal coil, moisture condenses and instantly freezes into a solid block of ice. Verification: Monitor copper suction lines for frost accumulation and check indoor supply air temperatures.
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