This paper presents an experimental investigation of building room heating and ventilation by using a combination of solar chimney and geothermal air tube heat exchanger. The geothermal tube is used to supply the room with fresh and heated air that is extracted inside the room by the chimney at the room top surface. Photovoltaic panel (PV) is installed inside the chimney to produce power and its performance is compared with PV installed outside the room. The system is studied for the chimney with and without PV and at inclination angle 30 degrees and 45 degrees. Natural ventilation and heating systems are compared with forced air flow inside the geothermal tube. The studied room locates in New Borge-Alarb, Alexandria, Egypt. Results indicate that natural geothermal tube-solar chimney at angle 45 degrees raises the room temperature by 6.4 degrees C and changes daily its air 46 times which represents 55.5% of the ventilated air by the forced air flow at 0.0184 m(3)/s. Heated and ventilated air of the room at chimney at of an angle 45 degrees with PV is greater than the case of 30 degrees. Maximum PV power inside the chimney is obtained at 30 degrees which represents 86.7% of the maximum PV power outside the chimney. (c) 2020 Elsevier Ltd. All rights reserved.