If your home warranty ever assigns "Schaffer and Sons" to fix your AC, immediately ask for a different referral. Trust me. Awful customer service. Awful follow through (they NEVER call you back or call ahead) and apparently their service techs suck too as they've been out 4 times attempting to fix a simple freon leak in my AC unit. The ineptitude of this company honestly can't be understated.
Even today, I called 3 times throughout the day wanting an update having to leave a message each time without a return call. So at 5:00 I try one more time but have to leave a message. Feeling that they are purposefully avoiding my calls, I pick up my wife's phone and dial them. And of course, they answer right away...