[thomaskkk]

Those that have AC ... vaccum the coils...use the brush component.
With an outside, nonwindow unit, take the garden hose to it, with AC off, and the spray facing away from the inside components. For me it is downward. Clean your filter or change it more frequently.

If you have not done this, I cannot explain in words what a difference it makes!
My father is a HVAC contractor, aaahhhhh, I am lucky!