I have been buying a 24 pack of 16 oz water bottles and freezing them in the deep freeze at home. Then like others have said load the fridge with all cold items.
Then I pack any area in the freezer that is not full with frozen water bottles and the same in the fridge. This makes a huge difference. If in really hot weather you can grab a couple frozen ones from the freezer and put them in the fridge and put the melted ones in the freezer at night. Works great. By the way this was not my idea, I stole if from someone here on the forum!
Besides those melting bottles of ice make for a great drink on a hot summer day!