A frozen evaporator coil in Port Charlotte is a symptom, not the root problem. You see ice on the copper lines at the outdoor unit, water pooling around the air handler or weak air from the vents. Something is keeping the coil below freezing.
Low airflow is the first suspect. A clogged filter, a dirty blower wheel, closed supply vents or a collapsed return duct all starve the coil of warm air. The coil drops below 32 degrees, moisture freezes on it, and the ice blocks even more air.
Low refrigerant is the second. When the charge is short, suction pressure drops and the coil runs too cold. That means there is a leak, and adding refrigerant without finding it just buys a few weeks.
Other causes include a worn-out blower motor capacitor, a blower set to the wrong speed tap and a coil face caked with dust and mold.
What to do right away: set the thermostat to off and the fan to on. That runs air across the coil and speeds the thaw. Change the filter if it is dirty. Do not chip at the ice. Thawing can take several hours and makes a lot of water, so check that the drain pan and condensate drain line are clear.
Once the frozen evaporator coil is thawed, we find the cause. We check static pressure, blower speed, filter sizing and refrigerant charge, and fix what is actually wrong so it does not freeze again next week.