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Old 11-17-2009, 01:15 PM   #1
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Humidity and hvac


Ok this is my problem, I am in Minnesota, I have had a mold problem in a couple of bedrooms I removed the sheetrock and replaced it, the rh is at 62%, I have bad condensation on the windows, there are 6 people living in the house. What is the best way to remove the humidity from the house, bear in mind I don't have the money for a whole house dehumidifier, will running the furnace fan all the time help, would installing something like the Skuttle 216 make up air help, would increasing the heat in the house help dry out the humidity it is currently set at 68 degrees in the evening and 60 degrees overnight and daytime I say this because normally people complain of low humidity in the winter. I have started running a portable dehumidifier but it has not made a difference yet. As a side note the 2 bedrooms that have had the mold are normally colder than the rest of the house.

Any help will be much appreciated.
Andrew


Last edited by andrewward; 11-17-2009 at 01:17 PM.
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Old 11-17-2009, 03:30 PM   #2
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Yep. Bringing in fresh air should lower it a lot.

An HRV may be what you need. Instead of just a fresh air intake.
An HRV will allow you to run it any time the humidity is high. And not remove all teh heat from your house.

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Old 11-17-2009, 06:10 PM   #3
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Not being negative but poorly insulated walls/houses and a lack of air circulation by those walls causes mold issues. If the wall is not properly insulated you get cold spots/lack of air movement causes the air temp on the wall to drop to the dewpoint/sweats and you get mold. A HRV helps a lot but is expensive to install for some people $2-3,000. No easy simple fix.
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Old 11-17-2009, 08:50 PM   #4
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Quote:
Originally Posted by yuri View Post
If the wall is not properly insulated you get cold spots/lack of air movement causes the air temp on the wall to drop to the dewpoint/sweats and you get mold.
To check, if a $60 IR meter shows cold spots on walls that correspond with mold spots on walls, very likely the OP needs insulation as a first try for a cheaper fix that is likely to work?

How 'bout trying elec. room heaters as a diagnostic aid?

Re: 6 people; "Over a day, the human body can put out as much as two or three gallons of sweat"

Last edited by Yoyizit; 11-17-2009 at 08:56 PM.
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Old 11-18-2009, 01:31 AM   #5
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The walls are insulated to r11 which is normal, the reason I know this is that I had to remove the sheetrock to replace it and I checked. The portable dehumidifier that I have been running today has dropped the rh from 62 to 58 degrees. Circulation could be a problem in the closet but not on the ceiling, I have checked in the attic and the insulation looks good but at the point where the surface mold was I drilled a small hole and injected some expanding foam just in case. Where I replaced the sheetrock the moisture had penetrated through it and stopped at the vapor barrier, so the insulation and studs were dry, thank goodness.

Andrew
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Old 11-18-2009, 03:59 AM   #6
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putting your furnace fan to on position to circulate air. and turning your exhaust fans on will bring down your humidity. bathroom' kitchen exhaust fans.
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Old 11-18-2009, 05:45 AM   #7
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R-11 and Minnesota. Nope! You need more insulation, sealing of all air leaks, and an air exchanger or hrv.
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Old 11-18-2009, 05:51 AM   #8
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One more thing. Are you close to the lake.
What is your outdoor humidity, when the indoor is so high.
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Old 11-18-2009, 10:00 AM   #9
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My mistake insulation is r19 (2x6 wall). I just checked weatherunderground and it says humidity is 76%, I am not very close to a lake maybe a mile. The wife complained like crazy last night because of the noise of the dehumidifier, but as I explained to her I can not have mold in the house we have to do all we can to reduce that, its the utility bill I am going to be worried about now lol.

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Old 11-18-2009, 10:06 AM   #10
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76%, at what outdoor temp? I forgot to ask that in the other post.
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Old 11-18-2009, 10:26 AM   #11
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41 fahrenheit

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Old 11-18-2009, 11:57 AM   #12
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Ok.

Introducing fresh air into the home, will lower your humidity, even at that high of an outdoor humidity.
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Old 11-20-2009, 02:01 PM   #13
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What do you think of the aprilaire 8126, it is $140 and I could install it myself

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Old 11-20-2009, 04:35 PM   #14
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Its a nice unit. I recomend it to many people.
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Old 11-20-2009, 05:18 PM   #15
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Will not work below 0 degF according to their specs.
http://www.aprilaire.com/index.php?z...y=16&item=8126
You need it to work much lower than that. Sorry
A HRV is probably your best bet and will reclaim a lot of $$ in heat.

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