How to Compare Room Humidifiers

Choose between tabletop and console units. Tabletop humidifiers are small and portable. They are easy to move and refill, but have a relatively low capacity. Console units are larger, but are still designed to be fairly portable. They provide large quantities of moist air, but may take up too much space for some homeowners.

Consider whether you want cool or warm moisture. Evaporative units blow air over a wet filter or wick, producing relatively cool, moisture rich air. According to Consumer Reports, they are also more affordable than warm mist units, which boil water internally before releasing cooled steam. If you choose a warm mist humidifier, look for one with anti-scald protection to reduce the risk of accidental burns.

Check filter options for each model. According to the EPA, using tap water in a humidifier can breed germs and bacteria. It may also leave a white dusty coating over surfaces in your home, especially if the water contains a high level of minerals. Look for units with built-in filters or demineralizing cartridges to reduce this effect.

Match the capacity of your humidifier to the size of the room. Humidifiers are rated by the manufacturer to work in a specific sized area. Choose a unit that is sized for a space slightly larger than your room to ensure you achieve the desired level of moisture.

Look for humidifiers with built-in humidity gauges, or humistats. Too much humidity can increase your risk of mold or dust mites, so it's important to keep a close eye on the amount of moisture in the air. A built-in gauge eliminates the need for a separate humistat.

Inquire about maintenance requirements for each model. Think carefully about the size of the tank. A larger tank needs refilling less often, but may be too heavy for some users. Smaller tanks require frequent filling, but are lighter and more manageable. Make sure the tank you choose will fit in your sink and under your faucet. For easy cleaning, look for humidifiers that can be disassembled and put in the dishwasher.