The two major energy sources in Vaastu science are: solar energy flux and geomagnetic energy flux. The science of Vaastu attempts to regulate and control the flow of these energies in a dwelling unit by selecting proper directional placements and geometric alignments. The location of openings (doors and windows), the painting of appropriate colours, the choosing of the right material for flooring, the designing of plinth levels, the proper planting of trees, and the design of the landscape play a major role in improving the energy field for all living beings to live in harmony with nature. The South, South-West and West are the directions where excessive cosmic particle activities happen.
Traditionally, in Vaastu science, the North is the source and the South is the sink for electromagnetic flux lines. Sub-atomic particles, which travel along the geomagnetic flux lines owing to matter and vacuum compression of cosmic gravitation waves, end up at the southern tip. Besides, it is determined scientifically that disproportionate or excess cosmic radiation particles which are positively charged particles, enter the earth from the West rather than from the East. In countries like India, extreme solar radiations come from the South, the South-West and the South-East directions. As is well-known, almost one half of a house is exposed to intense solar radiation, while the other half remains in the shadow region. The temperature gradient caused by this differential solar energy radiation in a dwelling leads to the formation of a thermocouple in the space surrounding the dwelling. Tropical countries, especially those in the South-East, South and South-West directions suffer from heat, while the North, North-East and North-West directions are in the shadow region and are relatively cooler.
This higher gradient or imbalance in heat energy levels creates turbulences in the naturally ordered geomagnetic flux lines, with the formation of nodes at the points where flux lines cross over each other. These nodes are subject to distorted energy potential and sub-atomic particles travelling along the flux lines in these zones can get confined at such dislocations. Under certain favourable conditions, these particles start resonating to give micro-level perilous or unsafe radiations. These emissions can be extremely detrimental to the existence of life forms. Metaphysically, the Vaastu Purush Mandala signifies this phenomenon through the symbol of Yama (death) representing the Southern direction.
The thermal gradients create an imbalance in the even flow of energy through and around the dwelling unit. Vaastu Shastra attempts to compensate and nullify these thermal differential gradients and impart harmonious and balanced living conditions for the occupants.
Some of the measures to offset the thermal imbalances in the South are:
1. Avoidance of openings in the South and the South-West directions.
2. Providing heavier and taller walls in the southern and western directions.
3. Slopes towards the South and the West to be avoided.
Slopes towards the East and the North to be provided.
4. More open spaces to be provided in the North and East directions.
5. The plinths of the South-West, South and West to be preferably raised.
6. Heavy trees can be planted in the South and South-West directions.
7. The North, North-East and East sectors to be kept light, low and clean.