I guess I should also point out that fans do have an inlet effect. You do not want to put the fan directly over the unit unless you have a hole cut in your cover grill. The expression used in the HVAC industry is "The world doesn't suck, it blows". By this it means that fans operate more efficiently by blowing through a restriction rather than drawing through it. Fans need a bit of space at their inlet to operate most efficiently (and more quietly).
As another example, some computer cases draw and blow through the case for a more efficient cooling operation.
The best install would require further raising the unit to install a fan underneath, have it blow up through the unit (obviously to take advantage of natural convection).
