Heil AC compressor dead after 4 years -- questions about labor warranties

So, our Heil NXA442 unit, recommended and installed by a local company with a good reputation, has failed after only four years. Although the compressor is covered under warranty, the labor and refrigerant charges are almost half of what the unit cost in the first place. The installers have no interest in helping, beyond discounting it by the amount of the two service calls it took to figure out why the unit kept blowing the main circuit breaker.

We'd be left with a new Heil unit which already proved unreliable, and of course a four year old coil. And a contractor that we no longer trust.

So, off shopping for a new unit, and wondering if an extended labor warranty is a good idea. Does "10 year labor" typically imply all labor and refrigerant costs, for warranty coverage?

The units we've been quoted:

Contractor 1:
American Standard Silver 13, 10 year parts and warranty
American Standard Silver 14, 10 year parts and warranty

Contractor 2:
Rheem SA13, 10 year parts, 2 year labor warranty
Trane XR13, 10 year parts, 2 year labor warranty

The Rheem and Trane are almost the same price, and both significantly less than the AS-- I presume due to the labor warranty. So we're tending towards the Trane, which seems to be pretty highly ranked across the board.

source https://hvac-talk.com/vbb/threads/2244152-Heil-AC-compressor-dead-after-4-years-questions-about-labor-warranties?goto=newpost