I would think ARI, IHACI, or another trade organization might have something. But this is something not easily defined. As quality of installation, frequency of maintenance, environment, type and amount of usage, system design, will all push the numbers in different directions.
You can probably get projected estimates from makers sites, and I would have said they'd generally be 10-12 yrs. But some warranties are getting a bit wild, so I'm not saying anything for certain. Like a lot of things, I've seen new ones fail, and ancient ones still running in the worst situations.