A House Humidifier Can Improve Indoor Air Quality If your indoor air quality is suffering, you may be surprised what a humidifier can do. Many homes in the Boston, MA area are too dry; the optimal level of humidity for a home is between 30 and 50 percent. Share this: Share on Facebook (Opens in new window) Facebook Share on X (Opens in new window) X Share on LinkedIn (Opens in new window) LinkedIn Share on Pinterest (Opens in new window) Pinterest More Email a link to a friend (Opens in new window) Email Print (Opens in new window) Print Share on Reddit (Opens in new window) Reddit Share on Tumblr (Opens in new window) Tumblr Share on Telegram (Opens in new window) Telegram Share on WhatsApp (Opens in new window) WhatsApp