We argue that if the magnetic field of Neptune does not possess a tilt and offset similar to that of the Uranus magnetic field, then the Neptune magnetosphere will lack what may be a major source of precipitation as compared to Uranus. Limited to auroral energy inputs alone, the Neptune exosphere may be much colder. Specifically, we expect the exospheric temperature at Neptune to be about 200¿K as compared to nearly 800¿ K at Uranus. It is also suggested that the high exospheric temperatures, which also have been observed in association with electroglow on Jupiter, Saturn and Uranus are a necessary condition for the occurrences of electroglow on Neptune. Implications of this work for the existence of Neptune electroglow are discussed. ¿ American Geophysical Union 1988