"Greg O" wrote in message
...

"Walter R." wrote in message
...
With the outside air at 90 and a RH of 50%, the inside temp at 80, with a
differential of 1.5 degrees, my A/C is on for 30 minutes and off for 40
minutes.

Is this 3t A/C sized correctly? I would like to know because the A/C is
getting old and I want to replace it with a new one. If this one is sized
correctly I will know what size to look for .

Thank you
--
Walter
www.rationality.net
-


Looks to me to be a bit over sized. A Manual J is the only accurate way to
know for sure, anything else is a guess!
My AC runs constantly at 95 degrees and it will maintain a indoor temp of 74.
Sized right on in my book!
Greg

This is Turtle.

I can keep 70ºF indoors with it 107ºF outdoors. Now it will run about 100% of
the time during the day lite hours. The Manual J said 3.25 tons and I upped to
3.5 tons. That 1/4 ton would make the difference at 107ºF outdoors these days.
Also that 1/4 ton hurts me on a 85ºF outdoor temp with not enough of run time. i
then installed a humidistat to override and keep a 55% RH or below.

TURTLE