I use Area lights to bake my scene because they’re directional. That is, I need my ceiling light to only shine down, not up, so that the ceiling itself is dark. But there is a problem, the shadows are too diffuse and soft, I need them to be crisper. I know it’s not a resolution problem because elsewhere in the scene there are harder shadows produced by a different type of light (Point light). Help?
As a general rule you can always remember, the smaller the light source, the harder the shadows (big == soft shadows). The second rule is, the farther away the light source, the harder the shaddows (close == soft shadows). This is not only something that is true to Unity. That’s how light works in real life as well. 
So in summary, try creating a small light source and move it away from your subject. That should do the trick.
Thanks, that worked, by decreasing the size and increasing the intensity, I got the hard shadows.
Awesome! So glad I could help!