I have heard horror stories from people who forgot to change the air filters in their a/cs; often they complain that whenever they turned their a/cs on, they instantly begin to get sick. They won’t realize what it is at first, but eventually, they will begin to suspect that their HVAC unit has something to do with it. When they finally go to check their a/c, they remember that they haven’t changed their air filter in a while. When they pull the air filter out of their a/c, it is covered in mildew as well as slime! However, this was not our experience, as I change our air filter pretty often, but this was the first time that I had forgotten. The a/c didn’t make me sick or anything, but there were subtle signs that something wasn’t right… My a/c was set to the coldest temperature, but it wasn’t blowing as strongly as it usually had in the past. When I listened to it closely, it would make slight whistling sounds that made it seem as though our a/c was being plugged from blowing as much as possible. I check the air filter in our a/c, plus sure enough, it was a little dirty. I had a new filter on hand, so I swapped it out and then finally turned our a/c back on, and no harm, no foul. When you inspect as well as wash your a/cs as much as I do, you realize that you prevent major HVAC concerns that many people experience. The next time your a/c stops working, check the air filter first.