The south has always been considered to be a bad direction but this is not true. The corresponding planet for this direction is Mangal (Mars). The owner of this direction is Yama, the Lord of death who is also in charge of legal affairs. According to Vastu Shastra, the south drastically affects the growth of financial prospects, career and business. The south is actually the storehouse for the energies that emanate from the north and hence there should be no openings in this area. Although this direction is owned by Lord Yama, the God of death, it can be made prosperous with effective Vastu solutions.
As a Vastu expert I suggest the south portion of a house should mostly be covered and devoid of any large openings so as to ensure no leakage of the positive energies coming from the North direction. There should not be large glass elevations or clear glass doors in the south so as to avoid the seepage of harsh solar energies from this direction which in turn cause lethargy and restlessness among the inmates of the house.