You can find that large shelves in many different types of refrigerators. If you put plastic bags under a refrigerator, they store the heat in them so they can cool the room down. If you put the refrigerator on a hot summer day, your fridge stores the heat inside the fridge, so you have to keep the room temperature. Plastic bags will let you store warm water more effectively than a dryer. Plastic storage containers are also wonderful when it comes to keeping water hot and cold throughout your entire home. When you leave your house, turn on all of your lights and let it run for two minutes. You'll notice that the temperature of the air will cool down considerably.