If you want to make a home-cooked stew or a slow-cooked roast beef for dinner, you might want to leave the oven turned off and reach for a crockpot instead. Not only are crockpots easy to use, they are also a more energy-efficient way to cook. The amount of energy wattage a crockpot uses is about 90 percent less than a conventional electric oven. And new crockpot models in the marketplace are even more energy-efficient. You can even find smartphone-enabled crockpots that let you lower and raise temperatures and turn off or on from your phone, wherever you might be!