Step #1: Turn your AC to the desired temperature. (When it's super hot outside, we set ours to a nice 81, [or not so nice, depending on your preference] or 83, depending on the time of day, and crank up the fans.)
Step #2: Remove the faulty air filter from the AC vent. (When I bought this filter I didn't realize that it was going to filter so well that even air wouldn't get through.)
Step #3: Make sure the doors are closed. Not open.
Last Sunday I nearly blew a gasket in my brain, and it was going to be ugly. It was really hot outside, and was getting hotter. It was also warm in our house. 85 degrees warm, and it kept getting warmer and our AC kept running, and running, and running. After about two hours of the AC running and it not cooling our house down I decided there was a problem. I couldn't figure out why our house wasn't getting cooler, and it was making me nuts. I started to worry that our AC had gone out and we were going to bake to death in our house. It didn't help that the power kept going out that day because of some silly wind gusts. But I whipped out my gumshoe skills and set to work.
The first thing I did was realize that there wasn't much air coming out of the vents in the ceiling. Bummer. So I took the air filter out, realizing that it really wasn't letting any air through. Once that was out, the air was flowing nicely.
I thought all was well, but it was still really warm in our house, especially in the kitchen, where the AC usually blows most of the cold air. I may or may not have driven Matt nuts while I was pacing, probably rambling concerns and worst-case-scenarios of how we were going to have to get a whole new AC, because, after all, our neighbor next door just did.
But then I saw what may have been causing the problem. The door was open. The sliding glass door. It was open about six inches, and the curtain was covering up the opening. Hot air was pouring into our house, or the cold air was pouring out of our house, however you want to look at it. So I closed the door.
One point for the gumshoe.
And, if you are wondering, our house is nice and cool right now.