Air Conditioning - Signs I need more freon?

On the conderser, discharge line is cool (not cold) to touch.
Suction line (thick) is cold to touch. Is this an indication I need to call for a little more freon? I remember discharge line needs to be warm to touch?

2 ton Rheem. 10 seer. 10 years old. Indoor air temperature is 84 in (suction vent), 68 out (out vent) at 50% RH.

Was this temp reading at the air handler, or at a vent away from the unit?

I am going to day you are fine, 15˚ to 20˚ temp drop is ideal.

Is the unit falling behind or can't bring the temp down?

ice will start working its way out of the air handler suction line all the way out to the compressor,if fully charged you should read 10F rise on the exiting air on the condenser.the line out of the condenser section is the liquid line and should be warm on an 80F day.

If your temperature readings are accurate you should be fine although it is a little warm in your house. If your liquid line is cool it would be a sign of possibly too much refrigerant or a restriction but at this time of year depending on where you are it will not be very warm anyway. (example outside temp 80 liquid line temp approx.95)

Since the unit was installed about 10 years ago I haven't added freon. It is unlikely it has too much refrigerant.

Temperature readings were at indoor vents, not at the air handler. I took the temperatures shortly after AC started working. Temp was still going down. Outside was about 85 F and humid.

The discharge line at the condenser was at the outdoor air temperature. It had no heat at all, but not chill either. Freon pressure was 62 and 240 psi.
Thanks.

Because it is unlawfull to work on sealed refrigeration/ac sytems without proper certification we do not support or offer advice in this area.

Charging your own a/c. (http://forum.doityourself.com/showthread.php?t=315401)