When an outdoor heat pump or air conditioning condensing unit freezes up during the summer cooling season, you must take immediate action to thaw the system and prevent compressor damage. First, turn off the cooling mode at your indoor thermostat immediately, but leave the indoor blower fan switch set to "On" to force warm room air across the frozen indoor evaporator coil, which accelerates the melting process. Second, go outside and inspect your indoor air filter; if it is severely clogged with dust and dirt, replace it immediately, as restricted airflow is the primary culprit behind summer coil freezing. Third, inspect your outdoor condensing unit to ensure coils are clean and unobstructed by debris. Leave the system turned off for three to four hours until all ice has completely melted away. You can verify that the issue is resolved when the system restarts successfully, air filters are clean, and cool airflow resumes without ice formation.
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