What is the average lifespan of a rooftop A/C unit?

Two 25-year-old Dometics still working fine.

2005 Dometic ran fine until sold in 2013. New 2013 Dometic lasted 1 1/2 years--replacement lasted 8 months but was only run 4 of those months. I'm sure China has nothing to do with the last 2 quick failures. Next replacement was an old Elkhart made Dometic unit that had been on the shelf since before Chinese manufacturing started--running strong when shut down last fall. I watch voltage levels--don't think that was an issue for me with the 2 failures. More likely that leaking evaporator was the problem.

If it lasts more than the first 6 months, I suspect being connected to bad power is the likely culprit on most failures.

They were working fine on our prior coach when we sold it , 14 years old.
Our new coach has had all 3 roof units replaced in the first 4 years.

Three Dometic Durotherm15K heat pumps 14 years old...one capacitor and some shims to raise the fan motor up so the fan would not hit/drag. 100-150 days/year usage. Fortunately I bought a new old style spare unit before they were all gone to the "NEW" and improved style.

Anyone else notice a trend here? Older units working great, newer units being replaced. Pretty much indicative of where the industry is going. You could probably draw a line in time where Dometic took over the roof top AC industry.

Just for giggles, include your AC mfg. Mine are Duotherm.

2007 coach, replaced all 3 at 5 years, and have replaced one of those again. We do full time and run the AC whenever necessary, but not a good track record.

17 years....still going.....

Rear heat pump is 13 years old, front heat pump is 1.5 years old and it's the 4th one since the Rv was new.

Both of mine still working good, not bad for 20 & 24 yrs old.