House Humidity

Finally looked this up! I've been wondering what days allow us to open the windows. 

1. Normal House Humidity

   • Normal house humidity is between 30 and 50 percent. Lower and higher levels can cause various problems.
     

   Dry Houses

   • Humidity tends to fall below 30 percent in very dry climates, and in houses where a furnace or wood stove runs a lot during the winter. A portable or whole-house humidifier keeps humidity in the normal range.
     

   Low Humidity Problems

   • Houses that are too dry can cause people to have dry throats and noses, resulting in respiratory problems. Low humidity also causes dry skin. Wood can shrink, resulting in loose furniture joints. Additionally, you'll notice static electricity in clothing and carpeting giving you small shocks.
     

   Humid Houses

   • Humidity rises over 50 percent in humid climates, especially during warm temperatures. Central air conditioning is the best solution, but room air conditioners and dehumidifiers also can help.
     

   High Humidity Problems [being from Florida, I knew these well!]

   • High levels of humidity in a house can result in mold and mildew, problems with dust mites causing allergic reactions, infestation by other bugs, flaking paint and peeling wallpaper.