Buying Guide

Best Humidifiers and Dehumidifiers for Your Home

Before You Buy
humidifier releasing air
  • Adjustable humidistat: Standard control system that automatically turns unit on and off to maintain a preset humidity level.
  • Digital display: Digitally displays current relative humidity levels and settings.
  • Timer: Programmable control that lets you set the humidifier to run at certain times of day.
  • Automatic shutoff: Shuts off the humidifier when the tank is empty.
  • Medicine cup: Feature on steam humidifiers that evaporates vapor medication.
  • Filter sensor: System that alerts you when it’s time to replace the filter.
  • Dishwasher-safe tank: A tank designed for easy cleaning in the dishwasher.
  • Safety listing: A guarantee that an independent testing agency such as Underwriters Laboratories (UL mark), Intertek (ETL mark) or the CSA Group (CSA mark) has ensured the unit is safe for its rated use.
  • ENERGY STAR ®: A label indicating that the product meets stringent energy-efficiency guidelines as outlined by the U.S. Department of Energy and the Environmental Protection Agency.
Size
dual image of medium size and large size humidifers

To make the most of your humidifier, choose one based on the size of the room you’ll use it in.  


Small room humidifiers (aka "portable" or "compact" humidifiers) are recommended for spaces 400 square feet or smaller.

  • Can be used on for tabletops (check manufacturer's safety warnings)
  • Plug directly into wall
  • Use refillable water tank
  • Lightweight


Medium room humidifiers (sometimes called tower humidifiers) are recommended for spaces sized 400-1,000 square feet. 

  • Water tank requires less refilling than tabletop units


Large room humidifiers (aka console or tower humidifiers) are recommended for spaces more than 1,000 square feet. 

  • Use larger refillable water tank
  • Humidify several rooms
  • Not lightweight but can still be moved throughout home 


Whole house humidifiers (aka in-duct or online humidifiers): 

  • Introduce moisture directly into a forced air heating system
  • Carry moist air to every room
Buying the Best Humidifier for your Home
man enjoying humidifier in living room space

Before purchasing, be sure to understand your new unit’s tank capacity, run time and features. 

  • Output per day: Standard measure of a humidifier’s power, which determines how many rooms it can humidify. Some models may include a square footage or room number recommendation on the label.
  • Tank capacity: Amount of water the refillable tank can hold, listed in gallons. Typically, you need to refill larger tanks less frequently than smaller tanks. 
  • Run time: How long the humidifier can run on a full tank of water.


Compact Humidifier

Typical Output Range: 0.5-1.5 gallons per day

Suggested Application: Humidifying single, small room


Tabletop Humidifier

Typical Output Range: 2-4 gallons per day

Suggested Application: Humidifying single room


Tower Humidifier 

Typical Output Range: 2-4 gallons per day

Suggested Application: Humidifying single room


Small Console Humidifier

Typical Output Range: 6-8 gallons per day

Suggested Application: Humidifying 2-3 rooms


Large Console Humidifier

Typical Output Range: 9+ gallons per day

Suggested Application: Humidifying entire floor in a large house or all rooms in a small to medium size house (2,500- 3,000 square fee


Whole-house humidifier

Typical Output Range: 9+ gallons per day

Suggested Application: Humidifying all rooms in a medium size house (3,000-4,000 square feet)

Evaporative Humidifiers
tower height Evaporative humidifier

Evaporative humidifiers: 


  • A fan blows dry air through a wick, which absorbs water from a refillable tank or the household water supply
  • Cool water from the wick evaporates into the air, boosting the humidity level; wick filters impurities out of the water
  • Common design for tabletop, console and whole-house units
  • Must refill water tank 1-2 times a day and replace wick every 2 months
  • Relatively low power demands
Warm Mist / Steam Humidifiers
small Warm mist humidifier

Warm mist aka steam humidifiers:


  • Works like a tea kettle: Heating element boils water from a refillable tank or household water supply, generating steam that humidifies surrounding air
  • Removes impurities from the water, producing clean saturated air
  • Steam helps keep rooms warm
  • Quiet operation
  • Water tank must be filled periodically, but there’s no wick to replace
  • May be necessary to clean unit regularly, as impurities from water can build up in the tank

Tip: Vaporizers are small, low-output warm mist humidifiers. They have a built-in water reservoir, rather than a removable tank.

Ultrasonic Humidifiers
blue and white Ultrasonic humidifier

Ultrasonic humidifiers: 


  • A metal diaphragm vibrates at ultrasonic frequencies to break up water into a cloud of tiny droplets
  • Does not filter water, but demineralization cartridges can be added, as can heating options
  • Used in many tabletop models
  • Very quiet with relatively low power demands
  • Tank must be refilled regularly, but there is no filter to replace
Cool Mist Impeller Humidifiers
humidifier with Cool mist impeller features

Cool mist impeller humidifiers:


  • A spinning disc generates a fine mist of cool water
  • Does not filter water, so distilled water is recommended
  • Quiet; doesn’t use much power
  • No need to be refilled, and no filters to replace; clean tank regularly
Buying the Best Dehumidifier for Your Home
a woman refilling the water in a dehumidifier
  • Capacity: Standard rating for dehumidifier power, which indicates the moisture level and room size the unit can handle.
  • Drain hose connection: A connection that allows you to bypass the bucket in a portable dehumidifier and empty water into a hose leading to a drain. 
  • Automatic defrost system: Saves energy by automatically shutting off the unit if frost forms on coils preventing proper operation. 
  • Multi-speed fan: A type of fan that runs at slower speeds in less humid conditions, reducing noise and energy consumption. 
  • Built-in pump: System allows you to run the drain hose up to a window, sink or elevated drain. 


Small Capacity Portable Dehumidifier

Typical Capacity Range: 25-35 pints per day 

Suggested Application: Damp Conditions in small rooms


Medium Capacity Portable Dehumidifier 

Typical Capacity Range: 40-50 pints per day 

Suggested Application: Damp conditions in medium and large rooms


Large Capacity Portable Dehumidifier 

Typical Capacity Range: 65-75 pints per day 

Suggested Application: Wet or damp conditions in large rooms


Whole-House Dehumidifier 

Typical Capacity Range: 90-140 pints per day 

Suggested Application: Wet or damp conditions in a small-to-medium size house

Portable Dehumidifiers
Portable dehumidifier

Portable dehumidifiers offer some of the best small dehumidifiers for your home and come in other sizes accordingly. 


  • Work the same basic way as a window air conditioning unit: Fan blows moist air from the room across cold refrigerant-filled coils, which cool the air, causing the moisture to condense into water droplets. The water collects in a bucket, which needs to be emptied periodically.
  • Many portable models have a hose attachment that lets you drain the water directly into a sink or basement drain making them the best dehumidifiers for bathroom use.
  • Includes a separate heating coil that warms the air again before expelling it into the room.
  • Commercial dehumidifiers are commonly portable as well.


Tip: Basements commonly need a dehumidifier because of potential mold growth and mildew. The best dehumidifier for a basement and garage dehumidifiers will keep the humidity in that space at below 50% relative humidity. 

Whole House Dehumidifiers
Whole house dehumidifier

Whole house dehumidifiers are good for use in spaces up to 3,000 square feet.


  • Empties collected water into a drain leading outside the house rather than a refillable bucket
  • Works the same basic way as portable models, but with extra power necessary to dehumidify several rooms at once
  • Some dehumidifier models connect to ductwork in a forced air heating system; others are self-contained systems


Tip: Crawl space is an area with limited height under a floor or roof that can gather moisture if standing water or outdoor invades the space. The best crawl space dehumidifiers monitor the RH level in the crawl space and are easier to maintain than portable dehumidifiers.

Humidifier Benefits and Dehumidifier Benefits
woman and child enjoying humidifier in home

HUMIDIFIERS 


Using a humidifier in your home is a good way to avoid common cold-weather illnesses as moisture helps to hinder the movement of germs. A humidifier may make it easier for babies or children with colds to sleep as it can help reduce coughing fits. In addition to the health benefits, using a humidifier in your home will make occupants feel a little warmer, thus reducing heating costs.


If you're already suffering from a cold, allergies or respiratory conditions, a humidifier will make the air easier to breathe. Adding moisture to the air also helps to reduce common conditions caused by dry weather, including:

  • Scratchy, dry throat, eyes and skin
  • Bloody noses
  • Chapped lips
  • Sinus headaches


Different types of humidifiers like cool mist, warm mist, vaporizers, ultrasonic and cool mist impeller humidifiers are all boost the humidity with various methods.


DEHUMIDIFIERS


Dehumidifiers have several benefits to combat allergy symptoms or poor ventilated areas in your home. These are the advantages to having a dehumidifier in a home that may be capturing mold, dust mites, mildew or other triggers:

  • Reduce humidity levels
  • Diminishes musty or rotting smells
  • Limits dust
  • Lowers energy costs and helps cool home
  • Eliminates quick corrosion of electronics and tools
  • Eases skin irritation from too much humidity


In multi-housing units and apartment buildings, mold and mildew can travel through vents or cause build-up in walls. A dehumidifier can help manage these allergens and keep them from harming your health when operated regularly.