It is unlikely with the age of the unit that the unit had been upgraded to the new freon. KT Management is an ac company in the area with a good reputation. They do not charge was 2nd opinions. The problem is if the the line is leaking under the house the only way to correct is bring the lines out of the condenser unit(outside unit) run them up the outside, which they cover, into the attic, then over and down to the evaporator(air handler). This is the only way the lines can be run now. Sounds big, but any ac company can do it. Don't know much about Sun Kool except for they do all of Home Depots work. Have not heard good or bad about them, but would get a 2nd opinion and price anyway. Good Luck
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