Falling debris, whether leaves, twigs, or in some cases larger objects during storms, can damage coil fins or block the fan if the unit sits beneath overhanging vegetation, making periodic clearance checks around the unit worthwhile in areas with nearby trees. Direct, sustained sun exposure on an outdoor unit's control components in extremely hot climates can also accelerate the aging of plastic housings and rubber seals, making a simple shade structure, positioned without blocking airflow, a reasonable protective measure in particularly harsh conditions.