Unfreezing an iced-over outdoor heat pump or air conditioning condensing unit requires safely melting the accumulated ice without damaging delicate internal components. First, go to your indoor thermostat and switch the system mode to "Off" or "Emergency Heat" to stop the compressor and prevent further freezing while engaging auxiliary heat to keep your home warm. Second, inspect the unit and gently pour lukewarm tap water—never boiling water—over the frozen exterior coil fins to accelerate the melting process, taking care to avoid pouring water directly onto electrical control boxes. Third, check your indoor air filter and replace it immediately if it is dirty, as restricted airflow is a primary cause of freezing. Fourth, ensure that snow drifts or falling icicles are not blocking the top fan grille. You can verify that the unfreezing process was successful when all ice is completely melted and normal airflow or defrost cycles resume.
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