When you empty your freezer, put your frozen food in a cooler or cardboard boxes and top with layers of newspaper, so nothing thaws out.
Then, get some old, clean bath/beach towels and fold them up to fit on the floor in front of your freezer.
Next, set a fan about 6-8 feet away from the freezer and turn it on 'high'. This shouldn't take long. Be sure that the fan will NOT be in any water that runs out of the freezer, to avoid an electrical shock.
Have a pail or bowl to squeeze the water into after defrosting. You might have to change the towels occasionally.
Under the front of the freezer door, may be a tray that you can slide out that might have water in it, also. Remove that and wash with warm water before placing back under freezer.
After it's all defrosted, wipe the racks and walls of the inside with warm, not hot, water to which you've added a little vinegar or baking soda.
Place an opened box of baking soda in the door of the freezer to keep it fresh-smelling and re-stock with your frozen items.