Cold air likes to go down. When you open a fridge door, the cold air pours out at the bottom. When you open a chest, it stays in the chest. Also, a freezer pro

Cold air likes to go down. When you open a fridge door, the cold air pours out at the bottom. When you open a chest, it stays in the chest. Also, a freezer probably has better insulation than a fridge to begin with, since it's designed to hold bigger temperature differential.