 then I think you get a chance of getting it fixed. The fact that it's using Freon over a more modern refrigerant is not a problem. Most older systems do. And, yeah, we are changing over to better refrigerants now, but it's not a reason in and of itself to replace the entire system. If you can't identify the source of the leak, then you've got to make a decision as to whether or not you do want to replace it because I don't see any other sort of half measure that you could take. I hope that makes sense. Thanks so much for giving us a call at The Money Pit.