My home is located in Long Beach, CA about 4 miles from the ocean. The home is over 50 years old. Since I bought the house 3 years ago, I have been remodeling and upgrading every room. I have installed exhaust fans in the bathroom that vent out the roof.
Since I have lived here I have noticed that the humidity level in the house is higher then outside. I purchased a humidity gauge and times the outdoors are at 20%, the indoors will be over 70%.
I have purchased a dehumidifier and in the fall and winter months I have been dumping about 3 gallons of water from it daily. With the dehumidifier, I have been able to lower the level to 50% in the house.
I have checked all of the obvious areas for water leakage, eg. kitchen sink, bathroom sinks, water lines for the ice maker and laundry.
The previous owner had problems with slight mold on walls behind furniture and in closets. Since I have installed the dehumidifier, the musty smell has almost gone away. But, if the dehumidifier is turned off, the humidity level rises to over 70%.
Is there some other things I should be looking for? Other areas that cause high moisture?
mold does not like warm temperatures, in a typical closet is best to close the air cond. vent and leave the light on. This is to give you an idea of what I am talking about. If you have a basement with a furnace increase the ambient air temperature in the basement (dry bulb temp) Eliminate cold surfaces, and check your floor, it looks like your humidity might be sipping from your ground, since you said that the outside air humidity is lower than inside the home.
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