The home is not really that big, it just does not have many rooms, and the living room is huge.
It's an old house with great airflow, and currently only has two old AC units (one "ducted" and on floor style) and a few ceiling fans. With all the screens and whatnot, it looks to me like the previous owners did not use AC much, if at all.
The phase thing confuses me a bit. I understand that I can get (what I think is) the same single-phase supply using a neutral and any one of the three lines.
But when I have a three-phase motor, I can change the direction of rotation by swapping and two of the three lines.
How is it that they are all the same?
I hope to see the house again Saturday, and I'll try to check the meter. I just assumed that anything in Bangkok province was under the MEA.