central air condition system

alex

Need help with central air condition system.

I have a raise ranch type house with a force hot water heating system with copper baseboard, and a separate air condition system. For several years at this time of heating season with the air condition registers closed and heating system on eventually some of the ceiling room registers start to drip from condensation build up in duck work in the attic.

Duck work is metal from the air handler to registers and it’s well insulated. Ceiling joyce well insulated. Attic has a hip roof with perforated drip edge and ridge vent.
The only way I can keep it from building up is to keep registers open and run a/c fan for several hours per day.
Please Help!
p.s. if you cannot help please suggest help lines.

Thank you

Unknown

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SteveT

Drips

The warm moist air is riseing up into the ducts in the unconditioned attic space. The air is then cooling below the dew point and condensing in the ducts. The best way to fix this is to close the supply registers, and install a piece of rigid polystyrine insulation in place of the air filter. This will stop the convective air currents in the duct system and stop the drips.
Steve

frank s

what you have.......

Is a humidity problem in that house, usually the biggest culprit is the register in the bathroom....all that moisture will rise up into the grill while people are showering, but if your saying ALL the grilles are sweating and they are closed you got somethin else cookin in that house, especially if the duct is lined on the inside, and there is flex duct connecting the registers to the trunk line. Feel free to email me, I've been installing central air for over 25 years and I've never heard or saw anything like you've described. Sumpin ain't right as my old friend FfP (Frank from philly) would say

Dave Flood

Hi Alex,
Follow Steve Taylor's advice. Allthough this is not a hugh problem in the industry, it is a problem. Steve is right on with the cause of the problem. If you can seal the ducts above, you'll eliminate the warm moist air entering the ducts and condensing.

Dave Flood
Dir of Tech Ed
ICPA
Wallingford, Ct