There's nothing you can do to predict how long an air conditioner will work. Yes, the air conditioner IS a mechanical device that uses electricity, has a bunch of wires, a few items of electronics, and every item is subject to failure. One unit may run for 30 years and another not even work correct when leaving the factory.
If you air conditioner is working, and working well right now, don't mess with it. There's nothing you can adjust, you cannot add coolant, (they are sealed), and about the only thing you can do is keep the fins sprayed out every year and clean the filters on your ceiling inside the coach.
They require air-flow and if they do not get the air flow, they will ice up. If that happens, all you have to do is turn it off for a couple hours so the ice will thaw and then turn it back on. Make sure there is no obstructions for air flow (on the roof, or on your ceiling vents inside).
There are many YouTube videos discussing RV air conditioner maintenance procedures. Watch a few of them and that is about the best you can do. Just remember, the more you fiddle with them, the more likely you'll break something. And that is what you are attempting to avoid.
I have done absolutely nothing except clean the filter on the coach ceiling, and spray down the fins on the coil on the roof. That's it. Nothing more. 4 campers and 25 years and not a single problem.
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2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually
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