When cool outdoor air enters a home it tends to dry out as it warms up,
which increases the static electricity in the home and causes sinus
problems. Adding a humidifier with help to add moisture back into the
air and limit sinus problems. In the summer, even with outdoor relative
humidity hovering around the single digits, the humidity in your home
tends to be around 40%. The average comfort range for relative humidity
in a home is from 35 to 45%.