The main door of the house facing the south is considered to inauspicious as per the science of Vastu Shastra.
This hers is a simple Remedy for those who feel that it is inauspicious for the main door facing south.
Every Monday you have to visit a temple of Shiva and offer a Coconut.The Coconut with the head fiber [Shendi] intact must face Shiva. The Coconut should not be broken into two as is the practice. The you must pray for the welfare and protection of your house.
Then after coming home you must do the do the procedure for Vastu Shuddhi which I have described in the Post on -- Vastu Shuddhi.
This particular remedy has also been prescribed for those whose homes are located on slope.