It is advisable not to overcrowd the freezer. When you dump the freezer with items, they may prevent the cool air from circulating across the device. As a result, the interior of the freezer may not be as cool as it needs to be. It blocks the vents, obstructs the airflow inside, and further causes the food to defrost in spots. This eventually puts pressure on the condenser, making it also overwork. Ultimately, it contributes to the increased power consumption and electricity bills.