How to fix a frozen coil?

Fixing a frozen air conditioning coil requires a systematic approach to safely thaw the ice and resolve the underlying root cause that triggered the freeze-up. First, turn off the cooling function entirely at your thermostat, but switch the fan setting from auto to on so that the indoor blower circulates room-temperature air across the coil to accelerate melting. Place towels or a wet-dry vacuum around the indoor unit to manage the large volume of water that will drain as the ice melts, and never attempt to chip or pry the ice away with sharp tools, which can puncture the fragile copper tubing. Once the coil is completely thawed and dry, inspect and replace your dirty air filter with a clean one, as restricted airflow is the most common culprit behind frozen coils. Check all supply and return vents throughout your home to ensure they are fully open and unobstructed by furniture, rugs, or drapes. If the system freezes again after taking these steps, the issue is likely a low refrigerant charge or a mechanical failure such as a failing blower motor, requiring an expert HVAC technician to diagnose and repair the system properly.