Central Air Unit Not Cooling House

[BrendanMowgli]

I have 2 units- one upstairs and one downstairs-

The upstairs is blowing- I feel the air blowing- the thingamabob outside (can't think of the name) is operating, but no cold air. I did notice that there's no water being pumped out.

I hear its the compressor, but hopefully it's something else. Is there a few other checks I can do before I call the rapis- I mean the HVAC guy?

Thanks!

[unther]

If your AC is sized correctly and running correctly there should be about 20 degrees difference between return air temp and supply air temp on a "design" day. "Design" day outside temperature varies by location but 96 is pretty good for most of the US.