I understand and it could be a lot of variables. The manufacturer may let the contractor make the determination that it's covered by warranty vs a tech having to go out, diagnose it, submit the details to the company and wait for approval (or denial). They may pay a perfectly acceptable rate. It could be a really simple repair / swap.Some years back, when our AC/heat pump unit went out, the installer was more than happy to replace the compressor for us under warranty. Some work is better than none. Maybe not always the case, though.