If your air conditioner is cooling, but not cooling very well or enough, you want to check two simple things before calling anyone to fix your air conditioner.
The first thing to check is your furnace air filter.
A dirty air filter can restrict air flow and cause your air conditioner to not cool well.
The second thing to check is the outdoor coil to make sure it is not dirty with dust, or dirt and debris from nearby trees and bushes.
If the outdoor coil is clogged with dirt and debris, this can cause the air conditioner to not cool enough. If you find that your outdoor condensing coil is clogged, you could try to clean yourself. It should be cleaned from the inside out.
However we always recommend calling a professional if you are not trained to work on air conditioners. It is possible to wash out an air conditioner in a way that can damage some of the components. The furnace air filter is very easy to change yourself. A clogged filter often cause air conditioners to not cool enough especially in very hot seasons.