Bought a house with a York LX 4 Ton unit. The unit is 6 years old based on the date on the box itself. The outdoor condensor is leaking the refrigerant really badly. Had an AC company spend 2 days looking for the leak. Found it and seems it would cost about as much to repair so might as well get a better, more efficient model. Wanted this to last 10 more years but didn't happen for us. And the unit is VERY loud so hoping the new model we are buying is quieter.