Identifying whether your air conditioner is low on refrigerant (freon) involves observing several distinct performance warning signs. Major indicators include air coming out of your vents that feels lukewarm rather than chilly, ice forming as a solid block of frost along the indoor evaporator coils or copper refrigerant lines, a bubbling or hissing sound near the indoor air handler indicating a refrigerant leak, and significantly higher monthly electricity bills caused by the system running continuously without reaching the target temperature. Verification: Inspect the indoor evaporator coil for ice buildup and check supply vent temperatures.
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