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Short-cycling with weak airflow commonly points to restricted return air. Although the filter was changed, the return grille is obstructed. Clearing the blockage restores the designed air path, improving heat exchange and stabilizing the temperature differential sensed by the thermostat. Option A (thermostat) treats a symptom without addressing airflow. Option C (refrigerant) is inappropriate without pressure/temperature diagnostics; low charge typically presents differently and should be tested, not guessed. Option D worsens the problem by increasing static pressure and further reducing system airflow. WorkKeys Applied Technology stresses identifying the most probable, lowest-risk fix consistent with the evidence before escalating to complex interventions. Removing the physical restriction is inexpensive, fast, and safe, and it often resolves cycling issues by allowing proper return volume and coil performance.