Heating the basement in the summer to lower humidity would be very ineffective and costly. ENERGY STAR certified models remove the same amount of moisture from the air as non-certified models, but use 28 percent less energy! Here’s why: During the humid summer season, outside air enters through leaks in the top of the house (attic) and pushes cooler, air conditioned air out through the cracks in the basement or bottom story of your home. The key is, you say dry in winter and humid in summer. Oversized Air Conditioner I am using a dehumidifier to lower the humidity. There are several reasons. To my surprise, though, I found out that Seattle is actually one of the most humid cities in the US. Condensation is the change in the state of water vapor to liquid water when it comes into contact with any service. They absorb the moisture from the air and Reed Palms also do well in low light conditions. This is because the Relative Humidity (RH) of air goes up 2.2% for every one-degree you cool it. In the summer my home sits at 85% humidity in the basement unless I do something about it. This is because the basement is the most humid place in your house. Not only does a damp basement create a musty smell throughout a home, but it can also create problems with mold. When warm humid air from outside comes into contact with the cold concrete the air rapidly cools and condenses on the surface causing the wetness. First and the most obvious is that you are in a very humid climate. When this humidity gets into the basement, some of the moisture in the air condenses out onto cool surfaces. The humid summer months are more than uncomfortable. The dehumidification process converts latent heat in water to sensible … When basement windows are open in the summer, more warm and humid air is able to penetrate the basement which will cause condensation and make the problems even worse. If you wash your clothes in the basement, then always air out the basement again quickly and vigorously. With the salts I can get it down to 70-65% within a week or so. This little weather-related fact surprised me so much because the weather here never feels humid – at least to me. Basement condensation occurs when warm, moist air comes in contact with your cool basement walls and floor. In addition to Joe's comments a significant amount of your moisture problems are probably coming from outside air. Optimal humidity lies somewhere between 40% and 50%. Investigate the area under the home where the floors are damp and not in the basement. Follow these 4 steps to cure the problem and the odor. The basement humidity level in summer can be high so opening the basement windows is not ideal. It is to set your dehumidifier to 50 percent to make sure the basement humidity level in summer is not too low or too high. A musty smell in the basement that comes from mold and mildew presents potential harm to your home. Seasonal Issues: The volume of vapor in the warmer air is much more than colder air. Shop For Reed Palms’s on Amazon. In summer, the temperature is going to be high and hence the moisture content will be high. The basement in my house seems to be always damp and kind of smells moldy in the spring/summer/fall. Know what factors foster basement humidity then take immediate action to rectify them. In fact, according to one online publication, Seattle is ranked as the 38th most humid city in the United States. It may be a little difficult to reach 50%, but with the right device, you will surely get at this number. Then poor insulation may be what’s causing your upstairs to feel more humid. Homeowners dread moisture in their basement. To clarify - basement is humid. Basements have a knack for getting damp over time but mostly in summer. Summer humidity levels tend to stay closer to the 50% range, while winter humidity usually dips lower.