The air conditioning compressor is making this horrible screeching noise. So I make a call to my home warranty company. For $60, they send out an A/C technician, who diagnoses the problem as the fan going bad (bearings shot). Tomorrow he will install a new fan, at no additional cost.
Update: the fan was installed after requiring another replacement part - the fan blades. The tech told me that this repair job woudl have cost upwards of $800+ if I did not have the home warranty! This repair alone would have cost more than the price of the warranty!
Older story - just after moving in, the downstairs bathroom toliet and shower drain back up up and overflowed when the washing machine drained after running. The problem was that the drain running to the street was clogged. For $60, a plumber came out and cleared the clog with a snake. He said it normally would have costed close to $200.
Side Note: The repair man warned me about one nuance of my current warranty company (One Guard). He said that, regarding a/c compressors, they will only repair parts, never do a replacement. That "should" suffice over a long life, but will end up with lots of repair calls down the line.
He said that GE Home Warranty would cover the replacement of the unit if necessary. However, online reviews show that GE does not rate very highly.