Replies

1. 
   Clewless1 | Jan 12, 2009 04:31pm | #1

   Describe your AC unit more, please. Does it ventilate? All supply/return duct in attic? Are they new ducts? Were the ducts sealed?

   If running the fan reduces the humidity ... are we talking summer use here?

   In a closed system (supply and return, no ventilation) the humidity shouldn't change just from running the fan. The AC system is a dehumidifier by nature, so cooling use should reduce humidity.  Need more information.

1. 
   davejitsu | Jan 13, 2009 12:22am | #4

   AC is 3 ton And supply and return in attic. Customer says return located by bathroom All ducts run in attic I hope that helps going to send an ac guy there. cant say I know great deal about ac units Thank you

2. 
   DanH | Jan 12, 2009 06:15pm | #2

   Not clear. Is this a finished/occupied attic, or unoccupied? What area is the AC unit serving? Why is the AC unit running in the middle of winter?

   God is REAL, unless explicitly declared INTEGER
1. 
   davejitsu | Jan 13, 2009 12:07am | #3

   Ac unit runs in summer. attic unfinished. Not sure on ac system Ac serve 4 bedroom house. Soffits are closed off vynyl over plywood

1. 
   DanH | Jan 13, 2009 12:28am | #5

   Is it just the AHU in the attic, or the entire thing? If the AC condenser is in the attic, is the exhaust ducted to the gable or somewhere else, to keep it out of the attic? Where is the humidity high -- in the attic or in the house?Generally, when humidity is too high in an air-conditioned house, the problem is that the AC is oversized and doesn't run long enough.

   God is REAL, unless explicitly declared INTEGER

1. 
   davejitsu | Jan 13, 2009 07:23am | #6

   ac unit located in attic Humidty high in attic

   Edited 1/12/2009 11:24 pm ET by davejitsu

1. 
   DanH | Jan 13, 2009 02:31pm | #7

   How do you notice the high humidity?Is the drain from the AC properly routed to the outside?(Consider answering ALL the questions. They're asked for a reason.)
   God is REAL, unless explicitly declared INTEGER

2. 
   Sphere | Jan 13, 2009 03:44pm | #8

   I get the sense this poster is struggleing with english ( not a bad thing) and maybe we need to read from right to left?Spheramid Enterprises Architectural Woodworks

   Repairs, Remodeling, Restorations

    

   They kill Prophets, for Profits.

    

    

3. 
   davejitsu | Jan 13, 2009 05:14pm | #10

   I will revisit customer with list of questions and repost. And I do wish I paid attention in high school

4. 
   Clewless1 | Jan 13, 2009 04:24pm | #9

   Are all exhaust fans vented positively to the outside or do they vent to the attic?

   Is the A/C coil in the AHU draining to the outside?

   Have you checked the attic condition this winter? Checked for ice on the underside of the roof sheathing?

   We can help more if you help us fill in some of the blanks, here.