Stopping an air conditioner from rattling requires locating the exact source of the vibration and securing any loose components or clearing out trapped debris. First, safely turn off the power to the unit at the thermostat and the main circuit breaker before conducting any inspection. Inspect the outdoor condenser cabinet and tighten any loose screws, bolts, or protective grilles using a screwdriver or wrench. Check inside the unit to remove any accumulated leaves, twigs, or debris that might be touching the fan. If the rattling is coming from indoor ductwork or loose access panels, secure the metal seams with foil tape or sheet metal screws, and place rubber vibration-isolation pads under the unit if it is resting directly on a solid foundation.
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