When our specially trained technicians conduct a Home Comfort Assessment, one of the things they do is check the outdoor HVAC component. In this case, the dryer vent was located right beside the outside HVAC component. This unit was in the direct line of fire for the lint coming out of the dryer vent. Over time, the outside unit became caked with lint on the back side....to the point of having the consistency of a woolen blanket!
The before photo actually shows what the unit looked like after a section of the lint blanket had been removed so you can see how different it looks
The after photo shows the lint blanket. Notice the drill nearby for size reference. YUCK!!