@Anandraj Iyengar: This is actually a myth that South facing doors aren't lucky or have ill effects. The people staying in North/East/west directions may also have health problems or accidents or some other mishaps. The directions as per Fengshui are calculated with reference to your Kua Number. It is not necessary a north facing house will suit everyone. That goes clearer with two kids in the house staying in north facing house - both cannot be toppers in the class; but by far it is seen that the north facing houses have comparatively lesser problems than south facing but i would re-iterate it is absolute no principle.