Outdoor units reward maintenance more than any other Sub-Zero, because the environment is relentless. Keeping the condenser clean and the seal sound is what prevents the corrosion-driven failures that are genuinely hard to reverse.
When corrosion has gone far on an older outdoor unit, we'll be honest about whether a repair will hold or whether the environment has simply won — but most outdoor calls, caught in time, are straightforward.
The honest framing for an outdoor unit is that you're maintaining against the weather, not just fixing a machine. A unit kept clean and sealed in a coastal SoCal yard can serve for many years; one left to the salt air will ask for more, sooner — and we'll tell you frankly where yours sits on that curve.