AC is getting condo VERY Humid!

Old 06-05-11, 10:15 AM
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AC is getting condo VERY Humid!

I know that AC is supposed to take humidity out of the air but mine produces humidity. When I run it I get to about 70-75% HUMIDITY. WHATS GOING ON? It seems the drain is draining and all is working. I had a guy here last year he cleaned and changed the filter. The actual unit is on the roof of the building and is 5 yrs old. American standard is the furnace I am not sure if the AC is the same. It has been this way since I moved in and I run a dehumidifier stand alone unit that is a pain in the ass to empty 2x a day. Let me know your thoughts on this. Thanks All!!
Old 06-05-11, 10:38 AM
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What is the outside temp? Does the unit turn off on the hottest of days what's that temp. Is the fan on on or auto.
Old 06-05-11, 10:58 AM
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You are not adding humidity to the air.

Relative humidity is just that, relative.
It is based on the air's ability to hold moisture at a given temperature.
The higher the temp the more moisture it will hold so when a space is cooled it will hold less moisture giving you a higher percentage reading.
The more accurate humidity measurement is gr/lb (grains of moisture/pound of air).

The idea with comfort cooling is that as the air is cooled the a/c unit in time will remove moisture and lower the humidity.
If your a/c unit were properly sized and you have a relatively well sealed house you will remove enough humidity to be comfortable.
Once your temperature in the house is stabilized take a humidity reading and if it doesn't go down as much as it should it is possible you may have an oversize a/c or isn't working properly.

A hygrometer can be a frustrating device if you are unsure about how it works.
Old 06-05-11, 12:15 PM
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check the ductwork, make sure nothing is opened or pulling air from outside.
Old 06-05-11, 12:20 PM
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As mentioned earlier, to understand humidity you have to know two things:
One is the temperature at the moment.
Two is the humidity at the moment.

You put them together and you have Relative Humidity.
This is something other people can (sometimes) understand.

If you are writing about Relative Humidity's then you may have high humidity and it may be warm and wet.

On the other hand....if the temperature is below 40F
it may be cold and dry!

Once you have a temperature below 40F, you have less than one teaspoon full of water in about 32 cubic feet of air.

If on the other hand you have a temperature of 86F and above, then you have five teaspoons full of water and it is hot, humid, nasty.

So! Which is it?

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