The old practice as I was told is to remove the roof, let the house bathe in sunlight for a few days. Not so practical now.

No guaranteed, but isn't it better to ensure it is not haunted in the first place? It's called doing due diligence. If things still go bad, at least we've done our best.

It's like we cincai marry a girl instead of making sure she's the right one, because "how to guarantee she won't turn bad after marriage?"