The present invention relates to an oven (1) comprising a cooking chamber (2) wherein the cooking process is performed, a heater (3) for cooking the foodstuffs emplaced in the cooking chamber (2), a thermostat that controls the operation of the heater (3) and a control unit (4) that regulates the cooking parameters of temperature and duration such that energy savings is maintained at different temperature values (T1) defined by the user such as 160° C., 180° C., 200° C., 220° C., . . . according to type of food to be cooked.