As I open my front door I can see my rear house window, I've heard that it is bad feng shui that the Qi will go through the window. Is there a cure for this?

1. The most common approach is to have to place a partition between the front door and the window.

2. The partition need not be full height nor air-tight. If it is a reasonably "heavy" partition, make sure that it is properly "anchored". So that it does not fall down and "hurt" anyone.

3. Alternatively, close the window closes to the door (facing the door).