I know we got some HVAC guys on here so maybe someone can shed some light or give me an idea what I might be getting into.

Our central A/C unit is about 25 yrs old (yes, I know), but I would like to try and get the most out of it before replacing. Our furnace unit, however, is only about 6-7 yrs old.

I've got the thermostat set to 77 right now and the house is only reading 79. The A/C is running constantly to try and keep the house cool.

I check the two lines coming in from the compressor and the big line is cool and has a little condensation around the insulation. The small brass line is warm to the touch.

I haven't checked out at the compressor yet but the air coming out of the top is usually warm to moderately hot. It seems like the unit is working but maybe just needs re-charged??

What all may be involved in getting in re-charged, or are there some other things I can check? HVAC is definitely not one of my fortes.

Thanks!

Dan