For want of a fuse

Remember our air conditioner problem? The fine folks at Ultra Heating and Cooling told us that our compressor had failed and that we’d need a new compressor– say, $900 or so– and that given the age of our unit, we’d be better off buying a new one (oh, $2800 or so).
The home warranty company required me to call a company that they have a contract with, so I did: Oasis Heating and Cooling. Their guy came out, puzzled over the unit for about 10 minutes, and brought in a dead fuse. After it was fixed, voila! 61° air from the air vents.
I don’t know whether to ascribe Ultra’s diagnosis as incompetence or malice on the part of their tech. Either way, a) I won’t be calling them again; b) you shouldn’t either; and c) their pres is going to get a letter from me in the near future.