I need to replace my Ruud Achiever 9 condenser. The unit was manufactured in 1990. I live in the San Francisco Bay area where the weather is quite nice. I don't really need a lot of A/C. My wife and I work and we would only use this on weekends and perhaps very hot days.
Do I really need to replace the existing coil? I understand that I may not get the efficiency that is advertised but I don't think that it an issue given my situation. Are there any other risks besides lower efficiency?
Any guidance would be appreciated.