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Best Buy customers often prefer the following products when searching for large diffuser.

A diffuser is a device that uses water and a fan to create a cooling mist that circulates through the air. The mist helps keep your home or business cool and provides a soothing background ambiance. Browse the top-ranked list of large diffusers below along with associated reviews and opinions.

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  1. CRANE - 2 Gal. Tower Ultrasonic Cool Mist Humidifier with Remote - White - Front_Zoom
    Top comment

    "I love my new Crane tower humidifier because it doesn’t look like your traditional humidifier! I needed a large humidifier for my great room and I’m so pleased with this one! ...Easy to Use and Large Capacity"

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    Product Description

    The perfect humidifier and diffuser to keep your family healthy and happy. With its large 2 Gal. accessible tank and dishwasher safe parts, cleaning is so simple. Not to mention, its mist output runs for over 24-hours in a large size room and it works as a diffuser for essential oils and vapor liquids. It's optional color changing nightlight is also a great additional feature that gives off a soothing glow. Crane’s top fill ultrasonic cool mist humidifier and aromatherapy diffuser provides up to 500 sq. ft. of coverage and 24 hours of soothing moisture to help relieve the effects of dryness and congestion, helping you and your family to breathe easy and sleep through the night peacefully.
    See all Humidifiers
    Top comment

    "I love my new Crane tower humidifier because it doesn’t look like your traditional humidifier! I needed a large humidifier for my great room and I’m so pleased with this one! ...Easy to Use and Large Capacity"

    See all customer reviews

    Product Description

    The perfect humidifier and diffuser to keep your family healthy and happy. With its large 2 Gal. accessible tank and dishwasher safe parts, cleaning is so simple. Not to mention, its mist output runs for over 24-hours in a large size room and it works as a diffuser for essential oils and vapor liquids. It's optional color changing nightlight is also a great additional feature that gives off a soothing glow. Crane’s top fill ultrasonic cool mist humidifier and aromatherapy diffuser provides up to 500 sq. ft. of coverage and 24 hours of soothing moisture to help relieve the effects of dryness and congestion, helping you and your family to breathe easy and sleep through the night peacefully.
    See all Humidifiers
    See all Humidifiers
  2. CRANE - 1.2 Gal. Cool Mist Humidifier & Aroma Diffuser - White - Front_Zoom
    Top comment

    "It works amazingly and the aroma diffuser is the perfect touch! Would highly recommend....Coolest Diffuser"

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    Product Description

    The perfect humidifier and diffuser to keep your family healthy and happy. With its large 1.2 Gal. accessible tank and dishwasher safe parts, cleaning is so simple. Not to mention, its mist output runs for over 24-hours in a large size room and it works as a diffuser for essential oils and vapor liquids. It's optional color changing nightlight is also a great additional feature that gives off a soothing glow. Crane’s top fill ultrasonic cool mist humidifier and aromatherapy diffuser provides up to 500 sq. ft. of coverage and 24 hours of soothing moisture to help relieve the effects of dryness and congestion, helping you and your family to breathe easy and sleep through the night peacefully.
    See all Essential Oil Diffusers
    Top comment

    "It works amazingly and the aroma diffuser is the perfect touch! Would highly recommend....Coolest Diffuser"

    See all customer reviews

    Product Description

    The perfect humidifier and diffuser to keep your family healthy and happy. With its large 1.2 Gal. accessible tank and dishwasher safe parts, cleaning is so simple. Not to mention, its mist output runs for over 24-hours in a large size room and it works as a diffuser for essential oils and vapor liquids. It's optional color changing nightlight is also a great additional feature that gives off a soothing glow. Crane’s top fill ultrasonic cool mist humidifier and aromatherapy diffuser provides up to 500 sq. ft. of coverage and 24 hours of soothing moisture to help relieve the effects of dryness and congestion, helping you and your family to breathe easy and sleep through the night peacefully.
    See all Essential Oil Diffusers
    See all Essential Oil Diffusers
  3. Homedics - TotalComfort Plus Ultrasonic Humidifier-3.7L Top Fill - Black - Front_Zoom
    Top comment

    "The best feature is the large water capacity. My older unit required replacing water, daily, this unit once a week. ...It is nothing like the last one I had. It had 2 large tanks and had no restrictions of don't touch, only had to fill every 3 days. "

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    Product Description

    The HoMedics TotalComfort Plus Ultrasonic Humidifier produces a visible warm or cool mist for up to 65 hours of runtime. The warm mist setting kills up to 99.9% of bacteria so you can breathe easier knowing you’re helping to protect against germs. A night-light, essential oil tray, and auto-off timer ensure ambiance and premium air quality control in large rooms up to 547 sq. ft. The 1.4-gallon tank features Clean Tank Technology that helps protect the tank from mold and mildew.
    See all HoMedics Air Purifiers and Humidifiers
    Top comment

    "The best feature is the large water capacity. My older unit required replacing water, daily, this unit once a week. ...It is nothing like the last one I had. It had 2 large tanks and had no restrictions of don't touch, only had to fill every 3 days. "

    See all customer reviews

    Product Description

    The HoMedics TotalComfort Plus Ultrasonic Humidifier produces a visible warm or cool mist for up to 65 hours of runtime. The warm mist setting kills up to 99.9% of bacteria so you can breathe easier knowing you’re helping to protect against germs. A night-light, essential oil tray, and auto-off timer ensure ambiance and premium air quality control in large rooms up to 547 sq. ft. The 1.4-gallon tank features Clean Tank Technology that helps protect the tank from mold and mildew.
    See all HoMedics Air Purifiers and Humidifiers
    See all HoMedics Air Purifiers and Humidifiers
  4. CRANE - 1.2 Gal. UV Light Warm & Cool Mist Humidifier with Remote - Gray - Front_Zoom
    Top comment

    "It also comes with a remote so no need to get up to change the settings. It’s large in capacity, and is an easy top fill humidifier. ...There are endless amazing features! I really like the diffuser feature and that it has a remote. This has improved my sleep as I no longer wake up due to a dry throat. "

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    Product Description

    The perfect warm and cool mist humidifier to keep your family healthy and happy. With its large 1.2 Gal. accessible tank cleaning is so simple. Not to mention, its mist output runs for over 24-hours in a large size room and it includes an easy to use remote and humidistat. It's built in aroma try make it usable with any essential oils. Crane’s premium top fill ultrasonic cool mist humidifier provides up to 500 sq. ft. of coverage and 24 hours of soothing moisture to help relieve the effects of dryness and congestion, helping you and your family to breathe easy and sleep through the night peacefully.
    See all Humidifiers
    Top comment

    "It also comes with a remote so no need to get up to change the settings. It’s large in capacity, and is an easy top fill humidifier. ...There are endless amazing features! I really like the diffuser feature and that it has a remote. This has improved my sleep as I no longer wake up due to a dry throat. "

    See all customer reviews

    Product Description

    The perfect warm and cool mist humidifier to keep your family healthy and happy. With its large 1.2 Gal. accessible tank cleaning is so simple. Not to mention, its mist output runs for over 24-hours in a large size room and it includes an easy to use remote and humidistat. It's built in aroma try make it usable with any essential oils. Crane’s premium top fill ultrasonic cool mist humidifier provides up to 500 sq. ft. of coverage and 24 hours of soothing moisture to help relieve the effects of dryness and congestion, helping you and your family to breathe easy and sleep through the night peacefully.
    See all Humidifiers
    See all Humidifiers
  5. Homedics - Top Fill Cool Mist Ultrasonic Humidifier - Large - Front_Zoom
    Top comment

    "I haven't tried the essential oil diffuser tray, but it is a good addition to the capabilities of what is already an excellent appliance. ...I love all the functions and how much water it can hold. I enjoy the oil diffuser part. I struggle with a really bad dry skin especially during the winter and I can’t wait to see how this works"

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    Product Description

    The HoMedics Top Fill Cool Mist Ultrasonic Humidifier. Breathe easier, sleep better. Ultrasonic, high-frequency technology converts water into a cool, fine mist that effectively adds moisture to the air. The easy-to-fill, easy-to-clean, top-fill tank holds 1.47 gallons of water, offers a runtime of up to 70 hours, offers whisper-quiet technology, and is ideal for family rooms and bedrooms up to 426 sq. ft.*. With all its bells and whistles, the Total Comfort Deluxe is a great addition to any home.
    See all Humidifiers
    Top comment

    "I haven't tried the essential oil diffuser tray, but it is a good addition to the capabilities of what is already an excellent appliance. ...I love all the functions and how much water it can hold. I enjoy the oil diffuser part. I struggle with a really bad dry skin especially during the winter and I can’t wait to see how this works"

    See all customer reviews

    Product Description

    The HoMedics Top Fill Cool Mist Ultrasonic Humidifier. Breathe easier, sleep better. Ultrasonic, high-frequency technology converts water into a cool, fine mist that effectively adds moisture to the air. The easy-to-fill, easy-to-clean, top-fill tank holds 1.47 gallons of water, offers a runtime of up to 70 hours, offers whisper-quiet technology, and is ideal for family rooms and bedrooms up to 426 sq. ft.*. With all its bells and whistles, the Total Comfort Deluxe is a great addition to any home.
    See all Humidifiers
    See all Humidifiers
  6. SPT - Ultrasonic 0.6 Gal. Cool Mist Humidifier - Royal Blue - Front_Zoom
    Top comment

    "Humidifier & Diffuser in One!...Good product. Diffuser works really well. Night lamp is nice"

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    Product Description

    Breathe easier and sleep more comfortably with this SPT Ultrasonic SU-2550B humidifier that uses a cool mist to increase the amount of moisture in the air. An integral fragrance diffuser lets you simultaneously dispense your favorite scent.
    See all Essential Oil Diffusers
    Top comment

    "Humidifier & Diffuser in One!...Good product. Diffuser works really well. Night lamp is nice"

    See all customer reviews

    Product Description

    Breathe easier and sleep more comfortably with this SPT Ultrasonic SU-2550B humidifier that uses a cool mist to increase the amount of moisture in the air. An integral fragrance diffuser lets you simultaneously dispense your favorite scent.
    See all Essential Oil Diffusers
    See all Essential Oil Diffusers
  7. Vornado - Lucerna 2 Alchemy 1 gallon Ultrasonic Humidifier - Black - Front_Zoom
    Top comment

    "Diffuser...Love diffuser! work's great very sensitive to touch...Very quiet. Large humidity output. Night light a nice touch. "

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    Product Description

    Experience humidification, illuminated. The Lucerna 2 is an ultrasonic humidifier in the Vornado Alchemy lineup that creates a majestic display of mist and light unlike any other humidifier. At 24 hours of runtime on low and 12 hours on high, the Lucerna 2’s 1-gallon water tank has the endurance to maintain a comfortable environment. The inspiring tank design and ambient light creates an illuminating experience independent from the humidity with 3 brightness settings to elevate any surrounding. Backed by a 5-year warranty to give you comfort and peace of mind. LUCERNA – Humidification doesn’t have to be humble.
    See all Humidifiers
    Top comment

    "Diffuser...Love diffuser! work's great very sensitive to touch...Very quiet. Large humidity output. Night light a nice touch. "

    See all customer reviews

    Product Description

    Experience humidification, illuminated. The Lucerna 2 is an ultrasonic humidifier in the Vornado Alchemy lineup that creates a majestic display of mist and light unlike any other humidifier. At 24 hours of runtime on low and 12 hours on high, the Lucerna 2’s 1-gallon water tank has the endurance to maintain a comfortable environment. The inspiring tank design and ambient light creates an illuminating experience independent from the humidity with 3 brightness settings to elevate any surrounding. Backed by a 5-year warranty to give you comfort and peace of mind. LUCERNA – Humidification doesn’t have to be humble.
    See all Humidifiers
    See all Humidifiers
  8. Honeywell Top Fill 1.25 gallon Ultrasonic Cool Mist Humidifier - Black - Left_Zoom
    Top comment

    "Large tank is really a plus. Relatively easy cleaning. ...The strength of the humidifier can also be adjusted and I find the max level is pretty strong compared to my smaller diffusers at home. This product works well but the essential oil part doesn't really work? "

    See all customer reviews

    Product Description

    The Honeywell Top Fill Ultrasonic Cool Mist Humidifier provides a cool, soothing mist that helps maintain proper humidity levels in your living spaces. This compact, quiet humidifier is perfect for use throughout your home and can be helpful year-round to provide relief from dry air caused by furnaces and air conditioners, putting nourishing moisture back into the air to naturally hydrate skin.
    See all Humidifiers
    Top comment

    "Large tank is really a plus. Relatively easy cleaning. ...The strength of the humidifier can also be adjusted and I find the max level is pretty strong compared to my smaller diffusers at home. This product works well but the essential oil part doesn't really work? "

    See all customer reviews

    Product Description

    The Honeywell Top Fill Ultrasonic Cool Mist Humidifier provides a cool, soothing mist that helps maintain proper humidity levels in your living spaces. This compact, quiet humidifier is perfect for use throughout your home and can be helpful year-round to provide relief from dry air caused by furnaces and air conditioners, putting nourishing moisture back into the air to naturally hydrate skin.
    See all Humidifiers
    See all Humidifiers
  9. CRANE - 1 Gal. Drop Cool Mist Humidifier with Sound Machine - Grey - Front_Zoom
    Top comment

    "Instead of having to keep track of separate electronics (humidifier, sound machine, nightlight, & oil diffuser), this one product houses all of them. It’s easy to move from room to room and is compact enough to take with us when we travel. ...Bonus for lights that turn off after your choose your settings, which was distracting no matter your age. Additional diffuser included if you want to add that without needing a separate machine. "

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    Product Description

    Get relief from cold and flu symptoms and bring wellness to your entire family in style with a Crane top fill Drop humidifier with sound machine. With an award winning design & top rated performance, Crane’s 1.0 Gal. top fill Drop ultrasonic cool mist humidifiers provide up to 500 sq. ft. of coverage and 24-hours of soothing moisture to help relieve the effects of dryness and congestion. Use with Crane’s vapor pads (HS-1950 & HS-1950L) for an elevated experience to help you and your family breathe easy and sleep through the night peacefully.
    See all Humidifiers
    Top comment

    "Instead of having to keep track of separate electronics (humidifier, sound machine, nightlight, & oil diffuser), this one product houses all of them. It’s easy to move from room to room and is compact enough to take with us when we travel. ...Bonus for lights that turn off after your choose your settings, which was distracting no matter your age. Additional diffuser included if you want to add that without needing a separate machine. "

    See all customer reviews

    Product Description

    Get relief from cold and flu symptoms and bring wellness to your entire family in style with a Crane top fill Drop humidifier with sound machine. With an award winning design & top rated performance, Crane’s 1.0 Gal. top fill Drop ultrasonic cool mist humidifiers provide up to 500 sq. ft. of coverage and 24-hours of soothing moisture to help relieve the effects of dryness and congestion. Use with Crane’s vapor pads (HS-1950 & HS-1950L) for an elevated experience to help you and your family breathe easy and sleep through the night peacefully.
    See all Humidifiers
    See all Humidifiers
  10. CRANE - 1 Gal. Drop Cool Mist Humidifier with Sound Machine - Clear/White - Front_Zoom
    Top comment

    "Not only is it a humidifier but it’s also an essential oil diffuser which is so nice. This has replaced my nightly essential oil diffuser altogether. ...We had so many electronics plugged in between the sound machine, night light, diffuser, and humidifier. This took over the job for everything and now his dresser looks so much better! "

    See all customer reviews

    Product Description

    Get relief from cold and flu symptoms and bring wellness to your entire family in style with a Crane top fill Drop humidifier with sound machine. With an award winning design & top rated performance, Crane’s 1.0 Gal. top fill Drop ultrasonic cool mist humidifiers provide up to 500 sq. ft. of coverage and 24-hours of soothing moisture to help relieve the effects of dryness and congestion. Use with Crane’s vapor pads (HS-1950 & HS-1950L) for an elevated experience to help you and your family breathe easy and sleep through the night peacefully.
    See all Humidifiers
    Top comment

    "Not only is it a humidifier but it’s also an essential oil diffuser which is so nice. This has replaced my nightly essential oil diffuser altogether. ...We had so many electronics plugged in between the sound machine, night light, diffuser, and humidifier. This took over the job for everything and now his dresser looks so much better! "

    See all customer reviews

    Product Description

    Get relief from cold and flu symptoms and bring wellness to your entire family in style with a Crane top fill Drop humidifier with sound machine. With an award winning design & top rated performance, Crane’s 1.0 Gal. top fill Drop ultrasonic cool mist humidifiers provide up to 500 sq. ft. of coverage and 24-hours of soothing moisture to help relieve the effects of dryness and congestion. Use with Crane’s vapor pads (HS-1950 & HS-1950L) for an elevated experience to help you and your family breathe easy and sleep through the night peacefully.
    See all Humidifiers
    See all Humidifiers
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