Each time you open the door, you lose 20 percent of your heat and risk improper browning or even baking failure. It will cost less to clean because it's already warm. Use the microwave oven to reheat foods. Small items cook faster than larger ones in microwaves. Whenever possible, cut food items into uniform size and thickness.
Refrigerators Never put more than one major appliance on an electric circuit.
Place the unit away from heat sources, such as direct sunlight, ranges, dishwashers and heat registers. Keep refrigerators and freezers nearly full, but not overcrowded, for maximum operating efficiency. Open doors only when necessary and avoid prolonged openings. It takes about 30 minutes for a refrigerator to cool down to its normal temperature after being opened for 30 seconds. Check gaskets around unit refrigerator and freezer doors for air leaks.