Yes, running your air conditioner when the indoor or outdoor temperature is set or drops to 67 degrees Fahrenheit (19 degrees Celsius) can cause the system to freeze up, especially if outdoor weather is chilly or airflow is restricted. Operating an AC when ambient outdoor temperatures drop below 60 to 65 degrees causes operating pressures to plummet, driving evaporator coils below freezing. While 67 degrees is a fine indoor setting during intense summer heat, running it in cooler weather invites ice formation. Verification: Monitor ambient outdoor temperatures to ensure they stay above 60 degrees before running cooling cycles.
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