The convective heat transfer coefficients hel and qel have been measured in gaseous air, O2, N2O, N2, F-12 and F-22 using a single platinum wire (diameter 0.025 mm) mounted along the axis of a copper cylinder (diameter 53 mm). The measurements were carried out as a function of electric field, pressure, orientation and frequency of the applied electric field in the earth's gravitational field. The convective heat transfer coefficient increases with increasing electric field. A similar trend is noted when the pressure of the gas is increased. The heat transfer coefficient also increases with increasing Td (the temperature difference between the wire and the surrounding medium). The behaviour of qel at Td equivalent to 0 is found to be similar to that for Td>0. If is found that qel always increases as the inclination of the cylinder is increased from the horizontal towards the vertical. The coefficient qel is found to decrease linearly with frequency f.