What does it mean that there can only be one Gan and one Kun in a house?

There can only be one Gan and one Kun in a house because of Feng Shui.

This is a question of Feng Shui. It mainly talks about the design of your house. Qian represents the sky and Kun represents the earth. The sky refers to the east and the earth refers to the west. Qianmen and Kunzao should be opened at On the east side, the kitchen should be on the west side to achieve good Feng Shui.