Air flow can become obstructed over time by the natural world.  It’s a good idea to visually check your unit occasionally to insure it’s got enough breathing room.  Some common air flow obstructions could include:

Leaves and other things that trees drop

Grass or weeds growing up into the unit

Personal items touching the unit

That Azalea bush you’ve been meaning to trim now growing into the side of the unit

A friendly bird building her nest inside

An unfriendly bird building her nest inside

Your oh-so-cute dog “using” it

“The better I can breath, the longer I can live.” – Love,  Your Air-Conditioner