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www.reference.com/home-garden/good-indoor-humidity-level-9...

Indoor humidity levels should be kept at 50 percent or lower. Keeping humidity down helps to keep mold and spores at bay, and helps to cool the home.

www.startribune.com/...the-ideal-winter-indoor-humidity-level/11468916

What is the ideal winter indoor humidity level? • If outside temperature is 20-below to 10-below, humidity indoors should not be more than 20 percent.

www.doityourself.com/stry/moisturehumidifier

It's important to maintain the proper humidity levels in your home and workplace to keep a comfortable, healthy space. Indoor humidity levels should be between 30 to 50 percent, with the ideal level being about 45 percent.

www.handymanusa.com/articles/properhumidity.html

Skin irritation, difficulty breathing and static electricity are among common problems that develop when indoor humidity is too low. Low indoor humidity is more likely a problem in some houses in winter months, when heaters and cooler temperatures combine to lower the moisture levels in the air.

www.dougtarryhomes.com/...winter-humidity...of-humidity-is-appropriate

Controlling Winter Humidity: What Level of Humidity is Appropriate If you are trying to maintain an indoor humidity level over 40% in your home during the cold winter months, there is a high probability that you are going to have indoor air quality and moisture issues.

www.hunker.com/.../what-is-a-good-humidity-level-in-a-house

According to the Environmental Protection Agency, indoor humidity should be in a range from 30 to 60 percent.

www.davidgrayheatingandair.com/articles/what-is-a-good...

Low humidity conditions can also be unpleasant, leading to excessively dry skin and other ailments. This will lead homeowners and business owners contemplating their heating, ventilation and air conditioning or HVAC system to wonder what is a good indoor humidity level.

www.reference.com/home-garden/ideal-indoor-humidity-level...

The ideal indoor humidity level for a home falls in the range of 35 to 50 percent. This range provides the optimal comfort and health. Keeping the humidity level below 50 percent in a home helps to prevent the population growth of mold and dust mites, both of which are common indoor allergens.

www.humidifierinformation.com/optimum-humidity-levels.php

Optimum Indoor Relative Humidity Levels - Do You Need a Humidifier? ... A relative humidity level between 40% and 50% is generally considered to be the most comfortable. Anywhere from 30% to 60% is acceptable, but ideally you want to avoid the extremes of that range. ... but require you to turn them on and off at the appropriate times so you ...

www.brighthubengineering.com/hvac/81719-best-indoor...

Best Indoor Humidity Range. The ideal humidity range is one that takes into account all of a home's inhabitants, both living and inanimate. Humans, books, and electronics all have their own particular ideal humidity range; fortunately, these ranges overlap. The best humidity range is the area where all three overlap.