Central nouns leak freon? I have lived in my condo for over 3 years in a...

I have lived in my condo for over 3 years in a minute. The first year our central air worked a moment ago fine. The second summer it wasn't cooling our place at all, the third summer I had a company come out and restock the freon and it worked great until the end of the summer. This summer it isn't working again and the guy said if it happened again here was probably a leak within the walls. Is there a way I can try and find the dribble myself, or do they have a tool they can use so they don't have to rupture up my walls? Obviously once they find the leak they will have to cut a hole, but I don't want more than one. Also, do you meditate the condo association would cover this since it is in the walls?
Then tolerate me see you do it without tearing out a wall. If the soak is through a wall what are you goin to do? Some one has to tear up the wall. Right. Anyways is intensely rare, is like one contained by a thousand chances that the leak may be at hand. There is leak detectors that technicians use and is not necessary to cleave up the wall. Most leaks are found on fittings, flare nuts, couplers, and others. Meaning at the unit it self. Anyways angelic luck. With a Freon leak there is usually a pale oil film on the copper row or around the condensing unit (outside coil), sometimes the service valve cap leak, they should be tightened after charging...check there first. The service company does use a outflow detector. A line leak would be cause by the copper rubbing up against a rough surface like brick. Good luck.
I estimate he meant a leak contained by the actual unit itself, probably in the walls of the evaporator. They in general will need to replace the leaking subdivision of the system; you'll need an expert to find the leak and address it.

Edit: by expert I indicate an ACrepair person; any qualified tech should be able to do this. Also, depending on the segment that is leaking, this could be an expensive repair.
Answers:    HVAC Tech.: There are many reason for the refrigerant lines to leak IN THE WALLS. I have see this in new unit and 10 year old ones. I would run what is called a SYSTEM COMPONENTS check. This is a examination where the system is split into three separate units. Inside coil. outside coil next to compressor, and the refrigerant lines. In this test each of these is separated and weld shut. Pressure is charged into them and left for 24 hours,then checked for loss or transfer. Which ever component lost pressure is the one that needs repair or replacement. Sometimes the LINES can be replaced without tear out the walls. Some warranties cover workmanship, some have a 5 year some own 10 years. You will need to check with the association conceivably have them check with the builder or the provider/installer. Good LUCK!
There's nothing you can do. I would find it concrete to believe there is a leak contained by the walls. Most units are install with soft copper tubing that is to say pulled through the walls as one solid piece. If you do have a leak likelihood are its at the condensing unit or the evap coil. Try a different repairman. The leak is so small it take most the entire cooling season before it leaks down. True, grease is a good indicator but is not always ideal, it can get you close sometimes. You can spray leak detector on the piping and fittings near freon in the system but the pressure is not high plenty to show where the leak is. The freon have to be removed and the system filled with nitrogen and sprayed beside leak detector to pinpoint the leak. I would guess and hope for you the ooze is in a fairly accessible location. If it's not, this can be time consuming.