Yes, it is surprisingly common for residential air conditioners to freeze up during the peak heat of summer. While it might seem counterintuitive that a system cooling a hot house would freeze, summer is when AC units work hardest and face the greatest risk of airflow restriction. A severely clogged air filter combined with heavy runtime hours, dirty outdoor condenser coils, or low refrigerant levels caused by seasonal leaks will easily drive evaporator coil temperatures below freezing, turning condensed humidity into solid ice. Verification: Inspect your indoor air filter monthly during the summer to prevent airflow choking and subsequent coil freezing.
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