Why Is My House So Humid?

Written by lexa w. lee Google
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A comfortable level of humidity ranges between 20 and 60 per cent. Although weather conditions determine humidity outdoors, human activities can add to higher humidity within a home.

Home Construction

A house with vapour barriers, windows and doors that fit tightly will hold in more heat and prevent the release of indoor moisture to the outside. Air conditioning, dehumidifiers, and fresh air intake ducts can reduce indoor humidity.


The heat from cooking produces a lot of water vapour and adds to indoor humidity levels. According to the Minnesota Blue Flame Gas Association, cooking for four people produces about 5 pints of water over a 24-hour period. Dishwashers also increase humidity.


A bath generates about 1/8 pint of water vapour, and showering releases about 1/2 pint. The Minnesota Blue Flame Gas Association reports that an extra 4 to 6 pints of water vapour can increase humidity within a 1,000-square-foot area up to 60 per cent.


Moisture from a washing machine and clothes dryer also raises humidity levels. Proper venting with ducts that open to the outside, the use of exhaust fans, and opening windows will help moisture escape outside.

Other Causes

All houseplants produce water vapour. Indoor furnishings, which typically absorb some of that moisture, will release it into the air in drier weather.

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