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Yes. A power outage, surge, or voltage fluctuation can affect electrical components within an HVAC system, even when the equipment appears to start normally once power returns. Problems may involve controls, capacitors, motors, thermostats, or other electrical parts, so unusual HVAC behavior after a power event should be evaluated rather than ignored. How Can a Power Outage Affect an HVAC

An HVAC system may shut down during the hottest part of the day because extreme outdoor temperatures place the equipment under its heaviest operating load, exposing airflow restrictions, overheating parts, electrical problems, or refrigerant issues. When the system cannot release heat or maintain safe operating conditions, built-in controls may stop operation to help prevent further damage. Why Does Afternoon Heat