Check and replace the filter(s).

Ok, since I first posted this I've done 3 things.
I've taken the filter completly out. It wasn't real dirty though.
I've turned the unit off. Just in case the lines were frozen.
And, I've cleared out a clog in the condensation drain. It was totally full of water and I think this may be the cause of the problem.

Any other ideas?

guess again. A clog in the condensate drain will keep water in the condensate pan and therefore add moisture to the air stream but will not affect air flow.

You need someone to check/clean the A coil. This might be dirty and will block air flow. Also, if the coil iced up, the air flow would be much less. After you restarted the a/c did the airflow increase at first then lessen?

You probably should have a service call and have everything checked out.

"After you restarted the a/c did the airflow increase at first then lessen?"

Yes, then this morning I noticed that it had lessened again.
I turned it off and asked the wife to leave it off till about lunch time.

Also, what is the A coil?
Is that the grill like area behind the big fan?
If so, that part is clean.

Well, I think the AC is freezing up.
I looked into the unit and saw several of the copper pipes in there and they were all frosted over.

Would that be because it needs more coolent?

2 reasons for evap coil freezing:

- low on freon
- reduced air flow across the evap coil from a dirty filter or dirty coil.

You have to look at the part of the coil where the air enters it to see if it is dirty. This is the side of the coil closest to the filter. If you have an "A" coil (shaped like an A), you have to look inside the coil - not on top or the outside, and there is usually a metal plate on the side of the A-coil that has to be removed first. If you have a slant coil, you should see the dirty side of the coil as soon as you open up the access door and remove the filter.

Well, it's all fixed.
He cleaned the fins behind the big fan, and I was amazed at the amount of dirt that came off. I had sprayed them down just last night and thought that I had cleaned them pretty well, but he put some kind of chemical on it and they are spotless now.
He also added about 2 pounds of freon.
It's now blowing colder than it ever has.
He only charged me $110.
I will definitely be recommending him to the neighbors