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Old 01-13-2009, 02:14 PM   #1
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Water on Windows-High Humidity


The humitity in my house is running around 50%. I have a Timber frame constructed home with SIP panels on roof and sides. I heat with hot water under the floor from a outside wood burner. My air exchanger is run manually, but when run does not have much of a effect on my humidity level. I recently installed a Dessicant dehumidifier. The air coming out of the dehumidifer is at 20 to 25%. After running it for 24 hours over the last two days (12 hrs. per/day) the level dropped to about 48%. I just cannot make much of a difference. If I could get my humidity to around 25% like other people that have houses in this area (Minnesota) I beleive the water would go away? Why am I so wet? I wipe the windows off several times aday. The south facing windows seem to dry up after the sun hits them.

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Old 01-13-2009, 02:38 PM   #2
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Water on Windows-High Humidity


Mechanical Dehumidifier maybe. They make them for ac air handlers.

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Old 01-13-2009, 07:17 PM   #3
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Water on Windows-High Humidity


Is it a HRV or an ERV. Is it clean/cells/filters/intake and exhaust hoods clean/ fan working properly?
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Old 01-15-2009, 11:00 AM   #4
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Water on Windows-High Humidity


The dehumidifier that I am using is capable of removing 4-5 pounds per hour. I installed ducting for it. After running it for 10 hours the humidity went from 52 to 45%. After turning it off overnight the humidity jumped back up to 52% (in 7 hours). My HRV seems to be in working order.

Where is the humidity coming from? In homes with forced air furnaces most people have to add water with a humdifier. Why do I have the opposite problem?
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Old 01-15-2009, 11:14 AM   #5
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Water on Windows-High Humidity


How new is the home is it still drying out? Also is your under the floor heat in cement or is it a wood floor? If wood are you on a crawl space or basement?
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Old 01-15-2009, 11:19 AM   #6
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Water on Windows-High Humidity


How new and how tightly constructed is your home? How much square footage? You mention radiant floor heat and an HRV, is the HRV tied into ducting that delivers air to the entire house along with AC air in the summer?

I am not familer with desicant dehumidifers but a quick google search leads me to believe they are more applicable in low humidity situations.

If your house is tightly sealed it will retain the moisture from all the usual sources, showers/cooking/etc.

As said in previous post you may need to step up to a mechanical dehimidifer to get the results you want. Most likely a whole house version tied into your air handling system. This would have the muscle needed to pull the moisture out.

Here is one link to whole house version:

http://www.aprilaire.com/index.php?z...tegory=dehumid
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Old 01-15-2009, 06:26 PM   #7
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Water on Windows-High Humidity


Check the HRV and make sure it is not stuck on defrost. Useless then.

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