A few days ago my AC stopped working; I noticed that the fuse had
blown, so I replaced it and it immediately blew again. Everytime I
turn the AC on the fuse blows (quite spectacularly; one time a spark
flew out into the air, but since the glass cover hadn't broken I don't
know how that happened), and since Not sure exactly what to do now.
Two of the fuses actually are breaking now, the one that handles the
cooling (not sure whether it's for the condenser or the evaporator) and
the one that handles the fan, though the fan's fuse doesn't blow every
time, just occasionally now.

I called the AC guy and he said I should call an electrician, which I
guess I'll do, but I wanted to consult the experts here and see what I
should expect them to do and how much it should cost. I live in Miami
so it has to be done (it's October and my apartment still gets to 95
degrees during the day without AC), but, I live in Miami, so there's a
great deal of shadiness here on the part of some contractors and I'm
worried I might get taken for a ride.

These are 30 amp S-type fuses, so as far as I can tell I can't really
go any higher. But since the fuse ran fine for about 2 years I'm
figuring this problem goes deeper than the fuse box itself.

So, any idea what could suddenly be causing this? Will an electrician
have to open up walls at all? Is there anything I can do to narrow
down the problem before I call?