Here is the standard experience:
1) Day 1 - AC breaks - you call and initiate the service with the warranty company. This just logs it and starts routing it to a contractor who will contact you on a future day.
2) Day 2- The contractor they utilize may contact you to schedule the initial visit. They aren't coming out; this is just when you are praying for a call. This never happens on Day 1.
3) Day 3 - If you are lucky, this is when the contractor actually comes out to assess the issue. In peak times, it won't be day 3. You get charged the $100 service visit.
Insert weekend interruptions into all 3 days. Nothing is progressing on a weekend. Zero. 3 days turns into 5 very easily. And is the ideal scenario.
4) if anything isn't "up to code", that work isn't covered and they won't do the repair without it. Here you are charged hundreds more, maybe even approaching a thousand
Summary: So here we are, almost a week later (at best), your home warranty annual payment was $750ish + $100 for the service + cost of work to bring things up to code, and you are getting a patchwork repair for a bottom feeder contractor.
You are better off "self-insuring"