upon arrival the system was cooling but not keeping up. I did a leak search and found a leak in evaporater coil. I noticed that it was a mismatched system. The AIRHANDLER was a R410A and the older condenser was R22. I explained everything to homeowner that it was mismatched and that Bay Area could not guarantee a coil replacement with mismatched units. I quoted new coil and several new complete matched systems. I could do nothing for unit today.