You may check the net how to calculate the house kua and its available everywhere. Read up some to gain extra goodies. ^^
A house kua may not change unless the house is totally demolished and rebuild, and a period has nothing to do with house kua.
Usually we want the house to benefit you, not you benefit to the house.
I found this and found my house Kua. It's either 1 or 9 East, depending on which side of the house you consider to be facing.
This is fine for me since I am an East person Kua 1. But my questions have nothing to do with the house.
My questions are should your head point towards the 3 killings direction or avoid it, should your desk face the 3 killings or avoid it?
For best solution is not using personal kua because you are occupying the house. Is better to use the house kua.
It doesnt matter where the bed is facing (I'm sure you may have many options), most important is you must get benefits from the house.
If you are following personal kua, you are giving way to your house. Now, tell your house that, from now onwards it must give you good