Image on the above left side just below the window looks normal. The infrared picture on the right side shows a temperature difference (different colors) indicating air / moisture leaking in the area. When I lifted the carpet I found wood rot from a window and stucco sealant leak
Image on the left is the underside of a front porch. With the use of the infrared camera, you can see the results of moisture leaking onto the ceiling. Dark blue spots on the right are from moisture. It turns out there was lots of wood rot above not visible to the naked eye.