The excavations on the Prehistoric tumulus of Archontiko, Giannitsa, brought to light successive phases of a settlement, which is dating from the late ΠΕΧ to the early MEX period, an era almost unknown in Macedonia. The main phases of the settlement. according to twenty-one radio-chronologies, performed by the Archaeometry Lab of Demokritos institution, were defined between 2300 and 1900 B.C. The later phase of the settlement was located on the top of the tumulus and is characterized by stone building foundations and pottery bearing incised linear decoration. Remnants of pile-dwellings were discovered on the east slope, while a number of intact vases, tools, weaving implements, etc was recovered on their floor. The most interesting find, however, is a great number of clay constructions: open fireplaces, platforms and small ellipsoidal furnaces stood on the house floor, perfectly serving the heating, lighting, cooking, etc needs of the inhabitants. The study of the pyrotechnology of the ellipsoidal structures, carried out by Dr. G. Maniatis, of the Demokritos Institution, showed that the temperature of their inner sides could have reached 500-600 centigrades. The warming up of the furnace, however, hardly needed more than 300-350 centigrades, a fact that supports the argument that these structures have mainly been used for cooking.