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How long to cool a house from 90 to 70

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How long to cool a house from 90 to 70 Terry 07-01-2007
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Posted by Terry on July 1, 2007, 11:37 pm
I live alone. I use a window ac unit most of the time. I have had
family visit. I turned on the central ac and it has been on for about
8 hours and it is only 77.


Posted by BobK207 on July 2, 2007, 1:38 am
> I live alone. I use a window ac unit most of the time. I have had
> family visit. I turned on the central ac and it has been on for about
> 8 hours and it is only 77.

Come on Terry......give us a little more to work with.

Cooling a house from 90F to 70F means bringing all the contents of the
house (interior of the insulation, if there is any) from 90F to 70F

AND cooling & condensing the water vapor in the air as well.

BTW 70F is way too cold 74 to 76F with adequate humidity reduction
is a more reasonable temp.

How big is the house? How big is the AC? What's the temp & humidity
outside? Are talking Phoenix or Atlanta? What's the sun exposure of
the house? Shade trees?


Eight hours to go from 90F to 77F doesn't seem too unreasonable.

Bob

If you've owned this house for any length of time your should already
know the AC performance.

Bob


Posted by m on July 2, 2007, 3:35 am
If there is more than two hours from starting the A/C for the
temperature to go down to the required level you have either too weak
A/C or it requires reparing.


Posted by CJT on July 2, 2007, 5:38 pm
m wrote:

> If there is more than two hours from starting the A/C for the
> temperature to go down to the required level you have either too weak
> A/C or it requires reparing.
>
I disagree. 20 minutes per degree +/- seems reasonable to me. I'm
pretty sure our central A/C could accomplish that. Since he's trying
to get a 20 degree drop, six or seven hours wouldn't be out of line.

His system is apparently going a bit slower than that, but isn't out
of range if it's humid or if he has lots of windows and it's a sunny
day.

--
The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form che...@prodigy.net.

Posted by classicrock86@g-mail.com on July 2, 2007, 4:34 am
> I live alone. I use a window ac unit most of the time. I have had
> family visit. I turned on the central ac and it has been on for about
> 8 hours and it is only 77.
you want to look at leaking ducting and insulation issues..if there
has not been any additions to the house and the central system was
installed with the correct size for your house and its not leaking
freon.. then duct leak and insulation may be the problem


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