You could also be at risk for carbon monoxide poisening............
The first thing to always check if you have excess condensation in your home are your flues. A blocked furnace, hot water heater, gas fireplace's flue (etc.) could be the cause.
One of the first signs of a blocked chimney, is excessive condensation in your home. A flue can become blocked at anytime from dead birds, loose debris, etc.
If you do have a blocked chimney, you need to shut the applance off and correct it immediately. This is serious. Remember, you cannot see or smell carbon monoxide.
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