 Posted 12/16/2003 4:33:42 PM
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| I live in Madison, WI. Our home is 10 years old, 1400 sq ft. with a fully exposed basement. We have had a severe humidity problem. I just replaced all the windows, with Anderson 400 series casements. The condesation problem, though better is still there. We are running a smaller dehumidifier which helps a lot in the great room. Without the dehumidifier the relative humidity is over 55. Our bedrooms, and basement still have the greatest problem. They are colder than the rest of the house and the dehumidifier does not work that far. What do you recommend? I need to do something that will take care of the entire house. Thanks, JB
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Posted 1/2/2007 5:40:14 PM
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Controlling moisture on windows during the cold weather in
WI should be handled by increasing the fresh air
ventilation rate. The dewpoint of the inside air must be
lower than the window temperature, which is about 32^F when
it 0^F outside. This lower than a dehumidifier can
paractically achieve. In addition, part of your high
humidity problem is that your homes needs more fresh which
has a drying effect. The correct air change rate is 50-75
cubic feet per min.. This provides removal of indoor
pollutants, replacement of the oxygen we need, and removal
of excess moisture. Increasing or decreasing the air
change rate decreases or increases the moisture in the
indoor air. A high quality bath fan like our Panasonic is
the simplest method to deal with the winter moisture
control. The ideal solution is our Santa Fe with a duct
kit or an Ultra-Aire 100V. These units ventilate during
the winter and summer plus keep the entire home dry when
the fresh air is wet.
Try this, turn your dehumidifier off and partially open a
high and a low window. As the relative humdidity decreases
and the moisture clears from the windows, decrease the
opening in the window to the minimum necessary to keep the
windows dry. You will notice your home is much fresher
also. This proves the point of outdoor air drying the home
as needed. This usually cost about $20 per month more for
heat because of the overventilating that occurs. If this
was done by a finely adjusted fan like the Ultra-Aire, the
cost for heat is about $50 for the winter. Call us for
more details. 608 2225301 ext 7803 Thanks Ken
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