Climate logic in Vastu: heavy south-west, south-east kitchen, trees and entrances

Vastu asks for the heaviest, tallest parts of a site in the south and south-west. Purkar et al. (2019) read this as shading: a tall mass there casts shadow on the main building during the hot afternoon, when the sun is low in the south-west sky.

Āgneya (SE) is the traditional kitchen zone. The paper notes that in much of India the prevailing wind comes from the north-west, so a kitchen diagonally opposite is downwind: smoke and smells leave the house rather than drift through it, and a fire is less likely to be fanned towards the rooms.

Big trees are kept off the east and north-east so morning sun can reach the house, and planted to the south, south-west and south-east where they shade low afternoon sun. This matches standard passive-design advice on using trees as shading devices.

An east or north entrance avoids the hot, glaring western sun and gives a shaded, cooler threshold where people adjust before stepping inside. Prevailing wind directions differ by region, so check local climate data before relying on any one rule.