Humidifiers
The right humidifier keeps indoor humidity between 30% and 50%, the range EPA recommends, without over-wetting the room. Choose the type by how you want to deal with minerals and cleaning, then size it by daily output in gallons for your room.
How to choose a humidifier
- Type: ultrasonic units are quiet but can leave white mineral dust with tap water. Evaporative units self-limit humidity and use wicks. Warm mist units boil water but use more energy and run hot.
- Output: roughly 1 to 2 gallons per day suits a bedroom. Large rooms and open areas need 3 gallons or more.
- Tank size: a 1-gallon tank on a 1-gallon-per-day unit needs refilling daily.
- Built-in humidistat: lets the unit hold a target humidity instead of running nonstop.
- Cleaning: EPA advises emptying and drying tanks daily and cleaning every third day.
Shop by type: Ultrasonic Humidifiers, Evaporative Humidifiers, Warm Mist Humidifiers and Whole House Humidifiers that connect to your furnace.
FAQs
What humidity level should my house be?
EPA recommends keeping indoor relative humidity between 30% and 50%, and below 60% to limit mold and dust mites. In cold winters, aim for the lower end of that range to avoid condensation on windows. A digital hygrometer shows the actual level so you do not over-humidify.
Which type of humidifier is best?
It depends on priorities. Evaporative humidifiers are hard to over-humidify with and leave no white dust, but need wick changes. Ultrasonic models are quiet and efficient but should use distilled water to avoid mineral dust. Warm mist units emit less mineral dust but use more power and are a burn risk around children.
How often should I clean a humidifier?
EPA guidance is to empty the tank, wipe it dry and refill it daily, and to clean the unit every third day, following the manufacturer's directions, to prevent bacteria and mold growth. Descale with white vinegar when mineral crust builds up, and replace wicks or filters on schedule.
Is a humidifier good for dry skin and sinuses?
Raising very dry winter air toward the 30% to 50% range can make the air feel more comfortable and may ease dry skin, lips and nasal passages for some people. Keep humidity below 50% to 60% so you do not encourage mold and dust mites, and clean the humidifier regularly.