One of my two A/C units quit on me. Compressor seized up (it was 10 yrs. old). I had a guy come out and replace it and he also did some work on the dryer. Next problem is that the system has no coolent, which suggests a leak. The guy who replaced the compressor gave me two options: 1) $60/hr. until the leak is found and the $200 to install the coolant; or 2) a flat $750 to find & fix any and all leaks, replace the coolant and guarantee the copmpressor & coolant parts of the system for one year. What do you think? Does it take 6 hours to find a leak? Is there usually more than one leak when a system goes dry? I'm on a budget, but I need to get this unit repaired.