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Old 12-28-2009, 01:27 AM   #1
Salty O'Shen
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Evaporation causing humidity problems inside my house


Okay, so this is my fist winter with the new setup and the evaporation that i'm getting from the tank is causing me problems around the house. all of my double pane windows are getting heavy condensation on them and it's causing me to have water pool up at the bottom of the larger ones, especially the sliding glass door.

what do you guys do to combat humidty/condensation during the cold months?
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Old 12-28-2009, 05:13 AM   #2
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how big is your house, and how much evaporation do you have? If it's at the windows, I dare say this is a common place for condensation and it may not be from the tank.
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Old 12-28-2009, 05:34 AM   #3
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I ran over 900 gallons of water in my basement in Kansas all year long and never really saw any real problems with the humidity. We never had to do anything.
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Old 12-28-2009, 07:54 AM   #4
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I left my problem too long before I did something about it and ended up replacing all my windows and doors and have a lot of drywall damage yet to be repaired.
It started off with window moisture as the only evident sign but after a couple of years, mold formed on the drywall at the ceiling along the edges and in the corners.
Some are able to take care of minor situations with dehumidifiers but in my case, I ended up installing a Lifebreath double cored HRV, the largest I could get without getting one designed for commerce.
An HRV brings in lower moisture colder outdoor air and exchanges the temperatures with the indoor outgoing air with moisture that evaporates, going to the drain.





Mine has two of the exchanger cores for more efficient transfer.
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Old 12-28-2009, 09:48 AM   #5
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A commercial dehumidifier can help. A simple ceiling fan can also have it condense less in one area and spread it throughout the house.
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Old 12-28-2009, 10:04 AM   #6
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i have to agree with chris and vinnie i dont think 75 gal. is enough to cause problems. i have my 75 and 14 in an apartment and have no problems with humidity but the landlord just replaced all the windows to double pane glass it could be a window problem.
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Old 12-28-2009, 03:20 PM   #7
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i'm evaporating around a gallon a day. i bought my house 10 years ago and never even had fog on the windows...this winter i've got water running down the windows on the coldest nights. the only difference is the tank. i've also noticed it's only happening on the windows that are in the two closest rooms to the tank, living room & kitchen. i'm virtually certain it's related to the tank.

not sure if i can drop the dough on the air exchanger, although it sure looks like a great concept. can anyone point me toward a quality dehumidifier?
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Old 12-28-2009, 04:31 PM   #8
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The tank is the likely source; especially if your main form of cooling is evaporation.

My 75 adds around 6% RH when the door is closed to the room it's in during the winter, based on the average of the rest of the house. With the door open, the RH in the house raises approx 2%. The house is around 1800 sq feet and an average of a week's worth of readings.

I went through the trouble of collecting my data so I could design a system to efficiently control the temp and humidity that will be put off by my current build without using a chiller, dehumidifier, or increasing air conditioner run time.
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Old 12-28-2009, 05:13 PM   #9
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you know... nothing has worked better for me than simply getting a good glass/acrylic cover for the tank. if you can get a tight fitting glass cover for the tank and cover as much of the sump as possible you should see a reduction. all of my evap stays in the tank.
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Old 12-28-2009, 05:15 PM   #10
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Quote:
Originally Posted by wharyat View Post
I could design a system to efficiently control the temp and humidity that will be put off by my current build without using a chiller, dehumidifier, or increasing air conditioner run time.
So what's the secret? Otherwise I guess I'm dumping a couple hundo into a dehumidifier...
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Old 12-28-2009, 05:23 PM   #11
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Quote:
Originally Posted by Salty O'Shen View Post
So what's the secret? Otherwise I guess I'm dumping a couple hundo into a dehumidifier...
Tightly sealed canopy & covered sump then venting the canopy (and maybe the stand) to the outside. The trick is making sure not to vent too much heated air in the winter or to much cooled air in the summer. I'll basically be using the tank as a space heater in the winter.
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Old 12-28-2009, 05:39 PM   #12
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after the slick drawing of your return line idea, i'd expect nothing less from the build you're doing...thanks for the input!
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Old 12-28-2009, 11:47 PM   #13
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It may be cheaper to get a tighter fitting hood, so no water escapes..
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Old 12-29-2009, 08:04 AM   #14
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You have to be careful in covering your tanks unless you are providing alternative fresh air sources (as wharyat suggested to the outdoors) or you will end up with virtually no gas exchange at the water's surface.
Every winter there are threads with people having pH problems and don't even have their tanks covered and it's due to high CO2 levels in the home because the home is "shut up" for winter. The same can apply in summer when A/C is turned on.
If those people then close off their tanks, the problem is made worse.
Others not having a problem, can then start to have one because pre capping off the tank the situation may have just been OK but any reduction in gas exchange can lead to the lowering of the pH.
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Old 12-29-2009, 09:57 AM   #15
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I've got a 75 in my apartment and without my dehumidifier, we have wet walls doors and windows. Then again my place hasn't been updated since the 70's when it was built.
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