Oven Tips : Check the seal on your oven door for wear. Even a small tear or gap can allow heat to wander away from your meal. A clean seal also provides better heat retention.
Microwave Tip : Microwave ovens use around 50 percent less energy than conventional ovens; they're most efficient for small portions or defrosting. For large meals, stovetop cooking is usually more efficient
Kitchen Tip : On electric stovetops, use flat-bottomed pans that make full contact with the element. A warped or rounded pan may be a conversation piece, but will waste most of the heat.