OK, I'm going to start this thread and as I get more info I'll update.

I have 1100 sf house with (I believe) 2.5ton AC unit. When the outside
temp gets above 80 or so the AC unit will not shut off cause it can't
keep up, even thought the I have the thermostat set on 80.
I have only 6" of insulation in the attice and have two-by walls. I
had a professional come out to inspect the ac and he said my problem is
the units too big. If the unit was too big for the house wouldn't it
run for short periods of time and the shut down and I would end up with
a cold/damp house. Instead it runs constant.
Any clues as what really needs to be done.

V/R Greg

wedge40 wrote:

OK, I'm going to start this thread and as I get more info I'll update.

I have 1100 sf house with (I believe) 2.5ton AC unit. When the outside
temp gets above 80 or so the AC unit will not shut off cause it can't
keep up, even thought the I have the thermostat set on 80.
I have only 6" of insulation in the attice and have two-by walls. I
had a professional come out to inspect the ac and he said my problem is
the units too big. If the unit was too big for the house wouldn't it
run for short periods of time and the shut down and I would end up with
a cold/damp house. Instead it runs constant.
Any clues as what really needs to be done. V/R Greg


First, have a heat-gain heat-loss done and do more to lower both!
Then do another heat-gain, and check the ductwork for tightness and
insulation.
Also, check for hot air entering the return air stream.
Measure the heat rise off the outside condenser and tell all of use what
all those temp reading were.

Where located, what state and large city do you live near?
Two & half ton would normally be way too large, which indicates major
problems elsewhere.
If you are drawing hot air from the attic or outside the heat-rise will
be large and the condenser overworked.
If there is little temp-rise through the condenser either it is not
getting an adequate heatload on the indoor coil or there are other
system problems.

Measure temps everywhere you can and tell us the Relative Humidity if
possible. - udarrell

--
Air Conditioning's Affordable Path to the "Human Comfort Zone Goal"
http://www.udarrell.com/air-conditio...tent-heat.html
http://www.udarrell.com/ac-trouble-s...ubcooling.html

Amazing when a homeowner has more brains than the AC company. The OP
is correct. If the unit were simply too big, it would cool the house
too quickly and it might result in excess humidity making for a cold
damp house. How any AC guy could tell you that your house is 80 deg
because the AC is too big is beyond me.

You don't say where you are, but 6" of attic insulation isn't much for
most areas. I'd look at ways to get more attic insulation in there.
And I'd get another AC company that knows what they are doing. Also,
what is the history on this? Did you just buy it? Did it ever cool,
etc?

wedge40 wrote:
OK, I'm going to start this thread and as I get more info I'll update.

I have 1100 sf house with (I believe) 2.5ton AC unit. When the outside
temp gets above 80 or so the AC unit will not shut off cause it can't
keep up, even thought the I have the thermostat set on 80.
I have only 6" of insulation in the attice and have two-by walls. I
had a professional come out to inspect the ac and he said my problem is
the units too big. If the unit was too big for the house wouldn't it
run for short periods of time and the shut down and I would end up with
a cold/damp house. Instead it runs constant.
Any clues as what really needs to be done.

V/R Greg

You had a professional in your home ... a cheating and fooling
professional

This slackjaws only purpose was like at least 50 percent of all firms
who refer to themselves as "heating and air contractor"..... to sell
you something........

Talk to friends family coworkers etc.... and find someone known to do
reliable hvac work....but remember this....no matter how many glowing
recomendations you get you still only have a 50 percent chance of
getting a professional and not an outright theif who will take your
money and run...leaving you with an inefficient system that is probably
going to need a compressor in a year...possibly a little longer.

wrote:
wedge40 wrote:
OK, I'm going to start this thread and as I get more info I'll update.

I have 1100 sf house with (I believe) 2.5ton AC unit. When the outside
temp gets above 80 or so the AC unit will not shut off cause it can't
keep up, even thought the I have the thermostat set on 80.
I have only 6" of insulation in the attice and have two-by walls. I
had a professional come out to inspect the ac and he said my problem is
the units too big. If the unit was too big for the house wouldn't it
run for short periods of time and the shut down and I would end up with
a cold/damp house. Instead it runs constant.
Any clues as what really needs to be done.

V/R Greg

You had a professional in your home ... a cheating and fooling
professional

This slackjaws only purpose was like at least 50 percent of all firms
who refer to themselves as "heating and air contractor"..... to sell
you something........

I'm not so sure the guy was even competent enough to be trying to sell
something. If I walked into a house where the complaint was it's 80
degrees and the AC is running but can't get it any lower, the last
thing I'd tell them is the problem is the current system is too big. I
just makes no sense at all and would most likely result in the
homeowner calling another contractor. On the other hand, if they told
them it needed a new compressor, recharge, etc, that would be a lot
more likely to fly.









Talk to friends family coworkers etc.... and find someone known to do
reliable hvac work....but remember this....no matter how many glowing
recomendations you get you still only have a 50 percent chance of
getting a professional and not an outright theif who will take your
money and run...leaving you with an inefficient system that is probably
going to need a compressor in a year...possibly a little longer.

Call an AC guy out. He should clean the outdoor unit with chemicals
and a garden hose. He should check the freon, and also check the air
flow through the furnace.

--

Christopher A. Young
You can't shout down a troll.
You have to starve them.
..

"wedge40" wrote in message
oups.com...
OK, I'm going to start this thread and as I get more info I'll update.

I have 1100 sf house with (I believe) 2.5ton AC unit. When the
outside
temp gets above 80 or so the AC unit will not shut off cause it can't
keep up, even thought the I have the thermostat set on 80.
I have only 6" of insulation in the attice and have two-by walls. I
had a professional come out to inspect the ac and he said my problem
is
the units too big. If the unit was too big for the house wouldn't it
run for short periods of time and the shut down and I would end up
with
a cold/damp house. Instead it runs constant.
Any clues as what really needs to be done.

V/R Greg