Hi - we have a typical home AC system - ours is a Ruud - the model number on
the outside unit is UAKA- 037JAZ. It's been very hot here in Texas - over
100 all day long, but the system is working OK and cooling the house -
plenty of cool air coming out of all the vents - the AC runs a lot these
days, but it always has when it's very hot outside since we've lived here -
I guess that's because it's an older unit (1996) and not as efficient as
some of the newer units. The filter has always been changed regularly.

For several months now, I'm hearing a loud buzzing noise from the outside
unit when it's running - the fan spins OK and there's hot air coming off of
the unit - the noise is nothing that keeps us awake at night, but certainly
noiser than my neighbor's units - they were replaced within the past few
years and they're newer.

Is this kind of noise typical of the older units?? If not, what am I likely
to hear is the main problem from the AC repair guy if the unit goes out and
I need to make a repair call?

I had something on the outside unity replaced a few years ago - I think it
was the start capacitor.

Thanks!