Air conditioning EV

I just bought a condo and am wondering whether or not to get a home warranty for it. Basically for $300/ year I can get any of my appliances repaired or replaced for $45. The big thing this comes into play for is if the AC unit goes out, since it costs several thousand for a new one. I tend to avoid insurance in most things since it’s usually –EV and I generally have a fair amount of cash readily available. However, I think it might be worth it in this instance since the unit was built in 1980 and still has the original AC unit. Thing is, I have no idea what the general life expectancy is of such a unit. Also, this is in Vegas where AC is obviously a bit thing in the summer.