This time of year spring is here for many of us in the world. I know here in Va we are geting hammered with pollen. It's not a bad idea to take a few minutes every so often to hose down the a/c unit out side. Give it a washing with the garden hose and knock off the pollen and grass clippings away. It's a little extra step like this which keeps your a/c running cooler and more efficient and will help keep the power bill down low as well. Another idea too is if you have alot of grass around the a/c unit, on the safe side shut the a/c off and cover it with a tarp and then mow and weedeat around the a/c unit to help keep crap from getting inside the coils. When done uncover and turn back on.