Yes, an air conditioner will almost certainly freeze up if it is low on refrigerant (freon). When a refrigerant leak reduces the total volume of freon inside the sealed system, the pressure drops significantly. This pressure drop causes the boiling point of the remaining refrigerant to plummet, driving the temperature of the indoor evaporator coil well below the freezing mark of 32 degrees Fahrenheit. As warm indoor air passes over this super-cooled coil, ambient humidity condenses and instantly freezes into a solid layer of ice. Verification: Check the indoor evaporator coil for heavy frost and monitor copper lines for ice buildup.
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