CY: First thing to do, check the thermostat. Is the switch (or setting
on an electronic) set to "cool"? You say it's set to 75, which is
good.

CY: Freon is a brand name for refrigerant. Like Mobil is a brand for
gasoline. Refrigerants are known by number. Cars used to use R-12,
until about 1993. and then they were changed over to R-134A. Building
AC used R-22, and actually, that's still in use. There is a new stuff
called puron, and I can't remember the R number. Freon doesn't go bad
unless the compressor burns out, which is unlikely here. However, it
does sometimes leak out.

If this is the first time that the unit is being used this year, the
problem is more likely to be electrical.

Or it could be something simple like a
fuse or circuit breaker!  [my guess, too]

Make sure that the unit *is* actually coming on
when it's supposed to (not just the blower inside the house, but the
actual
A/C unit itself). What this means. Go outdoors and stand next to the
outdoor unit. Is air blowing out the top of the unit? Can you hear the
compressor running? Is there a buzzing noise? Or maybe a buzzing noise
and no fan, and no compressor?

If it is, then the coolant needs to be checked.  [possible, but more
likely electrical problem is what I'm thinking.]

Another
thing is, the line that carries the coolant from the A/C unit to the
blower
could freeze.  We had that happen at an apartment we lived in once,
the line
froze solid so the coolant couldn't get into the blower, therefore the
blower was blowing tepid air. [Actually, the "frozen solid" line still
carries refrigerant. The problem is that the coil over the furnace or
in the attic freezes solid. This prevents air flow through the coil,
sometimes a bit of air goes around the coil. But refrigerant is still
moving through the copper tubes.]

"Matthew aka NMR> wrote...

I assume this is a central a/c unit, not window or in-wall. Go outside,
where the "big square thing"is beside the house, the fan may be either
separate or attached to it. You'll probably see the fan going...but
look to see if the "big thing" (compressor) is doing its loud humming
noise (not just the fan). Newer units don't use same type freon
as older ones, last few years mandated different gas type for
cleaner air. Many things can go wrong out there. Once my unit
in FL wasn't working because the whole fan had fallen off its
little feet support and plunked down inside the housing; easily
fixed by a professional who knew what he was doing. In that
case, fan was immobile outside, compressor was chugging away
at its job. Let DH look at it all.

Matthew, what is your background in AC?

Could be a couple things  yes the Freon could have bleed out,
depending on
how new the system is the electronic air sensor could be bad.  You
need to
turn the system off reset it, let it sit for a bit  try again if it
still
does not cool.  Need to call an A/C tech

Yes if it was bad it was still run  jut not cool

Oh, thank you for the tip, but I wouldn't know what they were telling
me. I have about zero comprehension for all things mechanical.
I think I am just destined to sweat all weekend. The cats are gonna be
l-o-o-ng for sure. You know how they do when they're hot, how they
stretch out.
It's cooled off to 80 in here, which actually feels quite pleasant.
DH Is off on a fishing trip; I'm not even gonna tell him when he calls
because this is the first time in a couple of years he's gotten to go.
He'd end up coming home to sweat along with me. He's just that kinda
guy :-)

Sherry

I guess you didn't read my earlier post.

Freon is a (formerly copyrighted) brand name for a brand of
refrigerant.

Saying "freon" is like saying "DelMonte canned food". There are
several different kinds.

Yes (although they don't use Freon any more because of holes in the
ozone layer), yes and yes.

A visit from the air conditioner repair man seems to be in order.