Best Cool Mist Humidifier for a Large Bedroom That Is Easy to Clean

The best cool mist humidifier for a large bedroom that is easy to clean, among these eight, is a top-fill model with a 6-liter class tank, and the listings that match best on paper are the DREO 6L HM524, the Levoit 6.2L smart model and the BREEZOME 6L, all of which list runtimes around 60 hours. The Lacidoll 8L is the biggest tank in the set with the largest coverage claim, and the 2.5-liter Levoit is the smallest and the most compact for smaller budgets.

Before relying on any of that, keep three caveats in mind. Coverage figures such as “800 sq ft” are seller claims. Noise numbers are seller claims. And nobody on our team has filled, run or cleaned any of these machines, so everything below is built from listing titles and general humidifier practice.

What “easy to clean” has to mean for a big-tank unit

Lacidoll 8L Large Humidifier for Bedroom Large Room Home 800 sq ft, Black | 48H Top Fill Cool Mist Humidifier for Baby Nursery, Humidity Control, Night Light, Essential Oil Tray, Safe for Plants & Pets

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Levoit Top Fill Humidifiers for Bedroom, 2.5L Tank for Large Room, 25dB | Easy to Fill & Clean, Quiet Cool Mist Air Humidifier for Home Baby Nursery & Plants, Auto Shut-off for Safety, 25H Lasting

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Homvana Cool Mist Humidifiers for Bedroom, Baby, Large Room (3.6L, Grey) | 23dB Quiet, 360° Rotatable, 36H Runtime, BPA Free, Top Fill, Easy Clean, 7 Color Night Light, Oil Diffuser for Aromatherapy

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BREEZOME 6L Humidifier for Bedroom Large Room Smart Humidistat Control | 60H Runtime, 25dB Quiet, Essential Oil Diffuser, Top Fill Ultrasonic Cool Mist Humidifiers for Baby, Plants, Nursery

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DREO 6L Humidifiers for Bedroom, 60H Runtime, 28 dB Quiet, HM524 | Precise Humidity Control, Easy to Refill & Clean, Nightlight, Cool Mist Humidifiers for Large Rooms, Baby Nurseries & Plants

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DREO 4L Humidifiers for Bedroom, 36H Runtime, 28 dB Quiet, HM311 | Easy to Refill & Clean, BPA-Free, Nightlight, Supersized Air Humidifiers for Large Room, Baby Nurseries, Plants, Indoor

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Levoit Humidifiers for Bedroom Large Room, 6.2L Tank, Smart App, Quiet 26dB | Top Fill Cool Mist Humidifier for Baby & Plants, Easy to Clean, 62H Runtime, Essential Oil, Precise Humidity Control

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Levoit Humidifiers for Bedroom 4.2L Top Fill for Large Room, NeoClassic 450 | 42H Runtime, Easy to Clean, 21dB Quiet Cool Mist for Baby, Plants, Night Light, Essential Oil Diffuser

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A bigger tank holds more water and therefore holds more to go wrong. Stagnant water in a warm, humid appliance is exactly where microbes and mineral scale like to settle, so cleaning access is not a luxury. Four design features make the job easier, and all of them can be checked in the photos or the manual before you buy.

• Top fill: you pour water into the top of the unit, with no tank to carry to the sink and flip. Every listing in this set says top fill or top-fill.
• Wide opening: if your hand does not fit into the tank, you will use a brush on a long handle, which is harder to keep clean.
• Few parts: fewer small removable pieces means less to wash and less to lose.
• A clear cleaning section in the manual: some manufacturers specify which cleaners are acceptable and which damage plastic or the mist element.

We cannot see inside any of these, so we describe what each title says and send you to the listing for the rest.

The eight at a glance

Tiers are relative to this group only. The Lacidoll and the Levoit 6.2L are the highest-priced pair, and four units sit in the lowest band. Check live prices on each page.

Water use math: what the numbers on the titles imply

Here is an original shortcut that works with the numbers in the titles: divide tank liters by listed runtime hours. The result is the water used per hour at whatever setting the runtime was measured on, which is usually the lowest mist setting. We are inferring that from how these figures are usually quoted, so confirm it in the manual.

The pattern is striking: seven of the eight work out to roughly 0.1 liter per hour at their quoted runtime, which suggests those runtimes describe a low setting with a similar output. The Lacidoll, with a higher rate near 0.17 liters per hour, suggests a stronger output, consistent with its larger coverage claim. That is an inference, and it is the kind of difference worth confirming in the manual.

Now the practical consequence for a large bedroom. If you need more than the lowest setting, consumption rises. As an illustrative assumption, suppose a medium setting uses two to three times the low rate, around 0.2 to 0.3 liters per hour. Over a 10-hour night that is 2 to 3 liters, so a 2.5-liter tank may run dry before morning while a 6-liter tank still has water left. For a large bedroom, that makes tank size more than a convenience: it decides whether you refill at 3 a.m. These are estimates with assumed multipliers, not measurements.

Sizing for the room: a worked example

Suppose your bedroom is 16 feet by 20 feet with an 8-foot ceiling. That is 320 square feet and 2,560 cubic feet. A coverage claim like “800 square feet” on the Lacidoll title would be a seller figure for an open space under the manufacturer’s own conditions; it does not mean the unit will raise humidity evenly across your room, especially if the door is open to a hallway.

A more careful approach is to treat coverage claims as ceilings. A unit with a claim well above your room size has margin; one with no claim in the title needs a look at the spec sheet. If you have a high ceiling, a leaky older house, or a bedroom that opens to other rooms, assume you need more output, not less. A hygrometer, an inexpensive meter that reads relative humidity, is the way to check. Many sources suggest keeping indoor humidity roughly between 30 and 50 percent, and that higher levels can encourage condensation and mold, so avoid running a humidifier non-stop without monitoring.

The eight humidifiers, largest tank first

Lacidoll 8L Large Humidifier for Bedroom Large Room, 800 sq ft, Black

The Lacidoll has the largest tank in the group, 8 liters, and the biggest coverage claim, 800 square feet, plus a 48-hour runtime, top fill, humidity control, a night light and an essential oil tray. The title also says “safe for plants and pets” and “baby nursery,” both seller claims that you should treat as marketing, not as a safety guarantee.

Our water math gives about 0.17 liters per hour, higher than the others, which would mean it puts out more mist at its quoted setting. That is good news for a large room and a mild trade-off in noise, though no decibel figure is given in the title. If you are a light sleeper, check the spec sheet before relying on it in a bedroom.

An 8-liter tank is heavy when full. Eight liters of water weighs about 8 kilograms, or roughly 17.6 pounds, before the unit itself. With top fill you avoid carrying the tank, but you still need to lift a watering can or jug above the top, so consider where you will place it and how you will refill it without spilling.

The essential oil tray is a feature to use cautiously. Oils can irritate the airways, skin and eyes and can be harmful to some pets. Only use them if the manual allows, and ask a doctor or veterinarian if anyone in the home has a condition or a pet. It sits in the premium tier.

Placement deserves a thought with a unit this size: leave clearance on every side, keep it off carpet where a spill would soak in, and avoid pointing the mist at walls or curtains. Wipe up any water around the base each morning, since a persistent damp patch is a sign the output is too high for the spot.

Pros

• Largest tank and coverage claim in the set
• Top fill with humidity control named
• Night light and oil tray included

Cons

• No noise figure in the title
• Heavy when full
• Premium price tier

Who it’s for: large or open-plan bedrooms where output matters more than silence.

Levoit Humidifiers for Bedroom Large Room, 6.2L Tank, Smart App, Quiet 26dB

This Levoit pairs a 6.2-liter tank and a 62-hour runtime with a smart app, a 26 dB noise claim, “precise humidity control,” top fill, easy cleaning and an essential oil feature. Its water use works out to about 0.1 liters per hour, a typical low-setting rate for this group, with the largest runtime after the Lacidoll’s tank.

The app is the distinguishing feature. Apps can let you set a target humidity and schedule operation without getting up, but they also require your phone, your Wi-Fi and the manufacturer’s software, and they add one more thing that can fail or change. The title does not say whether the unit works without the app, so check the listing for manual controls and a display.

The noise figure of 26 dB is a claim; decibel numbers depend on how and where they are measured, so we treat 26 dB as a signal that the unit is intended to be quiet, nothing more. A hygrometer reading from the unit’s own sensor can be a few percentage points off, so a separate meter is a good cross-check.

“Easy to clean” is another claim to verify in the photos. Look for a wide opening and removable parts. It sits in the premium tier next to the Lacidoll, so it is the pricier smart option, and the question is whether the app features justify the cost.

Before choosing it, open the listing and check whether the app is optional, whether the unit has a physical dial or buttons, and how the tank and cover come apart. Those three details tell you more about daily ownership than the headline features do.

Pros

• 6.2 L tank with a 62H runtime named
• Smart app and humidity control
• 26 dB quiet claim

Cons

• Premium price tier
• App dependence may not suit everyone
• Cleaning ease is a seller claim

Who it’s for: shoppers who want scheduling and humidity targets from a phone.

BREEZOME 6L Humidifier for Bedroom Large Room Smart Humidistat Control

The BREEZOME is the budget-tier entry with a 6-liter tank, 60-hour runtime, 25 dB claim and a smart humidistat, which is a sensor that holds a humidity setting. The title calls it ultrasonic cool mist, with top fill and an essential oil diffuser. It is the only title that states “ultrasonic,” which tells you how the mist is produced: a vibrating element breaks water into fine droplets.

That matters for cleaning and for dust. Ultrasonic units disperse whatever is in the water, so hard water can leave a fine white powder on nearby surfaces. The manufacturer may recommend distilled or demineralized water; read the manual. Mineral scale can also build on the mist element, so descaling per the instructions is a regular task.

The price tier is budget, yet the tank size matches the DREO 6L and the runtime matches too. That makes it the value pick on paper, though value depends on how the unit holds up and how easy it is to clean, and neither can be judged from a title. Look at photos of the tank opening and the base for places where scale and film could gather.

A humidistat is useful because it cycles the unit to hold a target, which can help avoid over-humidifying. Still, place a separate hygrometer in the room to check it.

Because the title specifies ultrasonic, find out what water the maker recommends and how often the mist element should be descaled. Buyers who skip that step often blame the humidifier for the dust that tap water causes, so settle the water question before the first fill.

Pros

• 6 L tank and 60H runtime in the budget tier
• Humidistat control named
• Top fill with an oil diffuser

Cons

• Ultrasonic mist can leave white dust with hard water
• Cleaning ease is not detailed in the title
• Oil diffuser needs careful use

Who it’s for: budget-minded buyers who want a large tank and will use water as the manual recommends.

DREO 6L Humidifiers for Bedroom, 60H Runtime, 28 dB Quiet, HM524

The DREO HM524 matches the BREEZOME on tank and runtime, with a 28 dB claim, precise humidity control, easy refill and clean wording, a nightlight and suitability claims for large rooms, nurseries and plants. The model number is useful: HM524 lets you find the exact manual and spec sheet instead of relying on the title.

The 28 dB figure is slightly higher than the Levoit and BREEZOME claims, but the differences between 21 and 28 dB are small on paper and depend on how they were measured. If noise matters, read independent reports or the manufacturer’s test conditions rather than assuming the lowest number wins.

It is in the mid-range tier, between the budget BREEZOME and the premium Levoit. The extra cost over the BREEZOME buys whatever brand support and design the page describes. Compare the two product pages for the tank opening width, the handle and the number of parts.

“Precise humidity control” implies a sensor-based mode. As with every unit here, the sensor sits near the machine, so the reading is not the same as the humidity at your bed. A separate meter on the nightstand is a better guide.

Because the model number is in the title, it is also the easiest to look up for a downloadable manual and cleaning guidance.

A good habit with any large tank is to mark your own fill line in your head and avoid topping up old water with fresh. Empty what is left, rinse the tank and refill each time, because adding to leftover water keeps stale water in circulation.

Pros

• 6 L tank and 60H runtime
• Model number makes manuals easy to find
• Humidity control and nightlight named

Cons

• Noise claim is higher than some rivals
• Mid-range price tier
• Cleaning ease is a seller claim

Who it’s for: buyers who want a 6-liter unit and prefer a model with a clear model number for support.

Levoit Humidifiers for Bedroom 4.2L Top Fill for Large Room, NeoClassic 450

The NeoClassic 450 has a 4.2-liter tank, 42-hour runtime and the lowest noise claim in the group at 21 dB, with top fill, easy-clean wording, a night light and an essential oil diffuser. The model name is another handle for finding the manual. Its water use works out to about 0.1 liters per hour.

The size is the compromise. Four liters is generous for a normal bedroom but is smaller than the 6-liter units, so on a higher setting in a big room it may run dry before morning. If your bedroom is over about 300 square feet, as in our worked example, plan to size up or accept a mid-night refill.

The 21 dB claim is intriguing for light sleepers. Treat it as an aim, and remember that the sound of water gurgling or a fan pulling air is part of the experience. Placement also matters: setting the unit on a hard table can amplify vibration, so a mat or a stable shelf helps.

It sits in the mid-range tier. If you are weighing it against the DREO 6L, you are trading tank size for a lower noise claim.

Cleaning is a seller claim; look for how many parts need to be separated and whether the base can be wiped without removing electronic parts. Never immerse the base.

If you are torn between this and a 6-liter unit, think about how you will use it. A quiet, mid-sized tank that you refill every evening can be less hassle than a giant one you forget to empty, so be honest about your habits.

Pros

• Lowest noise claim in the set
• Top fill with night light and oil diffuser
• Mid-range price tier

Cons

• 4.2 L tank may be tight for a large bedroom
• Noise figure is an unverified claim
• Cleaning ease is not detailed in the title

Who it’s for: light sleepers with a mid-large bedroom who value a low noise claim.

DREO 4L Humidifiers for Bedroom, 36H Runtime, 28 dB Quiet, HM311

The DREO HM311 is a 4-liter, 36-hour unit with a 28 dB claim, BPA-free wording, a nightlight and “supersized” large-room language. Its water use works out to about 0.11 liters per hour. The title’s mention of BPA-free plastic is a seller statement about the materials; check the listing if that matters to you.

It lands in the budget tier, undercutting the 6-liter DREO. For a bedroom of ordinary size, the lower price and smaller tank may be adequate. For a very large bedroom, the 36-hour figure at the lowest setting becomes a shorter night on a higher setting. Using our earlier assumption of two to three times the low rate, a 4-liter tank could last roughly 13 to 20 hours at the medium rate, which still covers a night, though it depends on the actual output.

This is a useful reminder that tank size and runtime are not the only things to compare. If you plan to use the humidifier daily, the cleaning routine matters as much: a smaller tank is lighter to carry and quicker to rinse, which makes the daily empty-and-dry habit easier to keep.

The model number HM311 helps you find the manual for cleaning guidance and replacement parts.

As with any model, confirm in the manual what the nightlight does when the unit is off or when the tank is empty, and whether the mist output can be adjusted in steps. Small controls like these decide whether you can leave the machine alone overnight.

Pros

• Budget price tier with a 4 L tank
• Model number for manuals
• BPA-free wording and nightlight

Cons

• Smaller than the 6 L options for big rooms
• 28 dB claim is on the higher side
• Cleaning ease is a seller claim

Who it’s for: shoppers with a medium to large bedroom who want a lighter, cheaper tank.

Homvana Cool Mist Humidifiers for Bedroom, Baby, Large Room (3.6L, Grey)

The Homvana lists a 3.6-liter tank, 36-hour runtime, a 23 dB claim, a 360-degree rotatable nozzle, BPA-free plastic, top fill, easy clean, a seven-color night light and an oil diffuser. The rotatable nozzle lets you aim the mist, which can help when the unit sits near a wall or bedside table.

At 3.6 liters, it is one of the smaller tanks, and the “large room” language in the title is a stretch for a very big bedroom. Our estimate of about 0.1 liters per hour suggests it can run through the night on a low setting, but a higher setting will shorten that. Place it a few feet from the bed on a stable, water-resistant surface, and keep it out of reach of children and pets.

A seven-color night light is a matter of taste. If you sleep with dim light, check whether the light can be turned off completely, as some units leave a glowing display on. The 23 dB figure is a seller claim in the lower part of this range.

It is in the budget tier. For small to mid-size bedrooms where cost and quiet matter more than capacity, it is a reasonable candidate on paper. Check the product photos for the tank opening width and the number of removable parts to judge how easy it will be to clean.

Because the title mentions a baby, remember that no humidifier is a substitute for safe placement. Keep it well away from the crib, keep the cord out of reach, and ask a pediatrician about humidity levels for an infant instead of relying on listing language.

Pros

• Rotatable nozzle lets you aim the mist
• Low noise claim of 23 dB
• Budget price tier

Cons

• 3.6 L tank is on the small side for a large bedroom
• Colored light may disturb some sleepers
• Cleaning ease is not detailed in the title

Who it’s for: smaller to mid-size bedrooms where cost and a low noise claim matter most.

Levoit Top Fill Humidifiers for Bedroom, 2.5L Tank for Large Room, 25dB

This is the smallest tank in the set, 2.5 liters with a 25-hour runtime, a 25 dB claim and auto shut-off for safety. The title says “for large room,” which we want to flag: a 2.5-liter tank is a better fit for a small to medium bedroom, and large-room use means a higher setting and more frequent refills. We read it as a smaller-room unit in a large-room-friendly design.

Applying our math, at 0.1 liters per hour the tank lasts 25 hours on the lowest setting, but at 0.25 liters per hour it would last only 10 hours, barely a night. Those are assumptions, not measurements, but they show why this is the unit most likely to run dry in a big bedroom.

The auto shut-off is a useful safety feature in principle: it stops the unit when the water runs out. Still, it does not remove the need to unplug the unit before cleaning, to keep cords away from water and to place it out of reach of children. Check the manual for how the shut-off works.

It is in the budget tier, tied with a few others, and is the most compact and easiest to carry to a sink. For a spare room or a small nursery, it could be a reasonable fit. For a true large bedroom, one of the 6-liter models is a better match on paper.

One reasonable role for this unit is a second humidifier: a compact one for a home office or a nursery while a larger unit handles the main bedroom. Compact tanks are also simpler to rinse in a sink, which helps the daily cleaning habit.

Pros

• Smallest and lightest to carry and rinse
• Auto shut-off named in the title
• Budget price tier

Cons

• 2.5 L tank is small for a large bedroom
• Would likely need refills on higher settings
• “Large room” wording is optimistic

Who it’s for: small to medium rooms and buyers who want the lightest tank.

How we picked these

Nobody on the team used or measured these units. The shortlist comes from published specifications, manufacturer documentation and buyer reviews, as well as a close reading of every listing title. A product qualified if it is a cool mist humidifier with top fill and either large-room wording or a tank of 2.5 liters or more.

We did not rank the eight by a score. Instead we compare tank sizes, runtimes, noise claims and price tiers, and we calculate the water-use shortcut from the titles. Anything beyond the title is “check the listing.” Because cleaning ease is the heart of the keyword, we also explain what features to look for in the photos and the manual.

The cleaning routine: a time budget

Easy to clean is partly about the routine. The table below is a planning example that assumes a typical top-fill unit, and the manual always overrides it.

Using those numbers, a daily 3-minute task plus a weekly 20-minute clean comes to about 41 minutes a week, or roughly 36 hours over a year if you run the unit all year (assuming 52 weeks). If you run it only in the dry months, the total drops accordingly. These are our planning assumptions. The point is that a machine that takes twice as long to clean will cost you extra hours, which is why cleaning access matters more than a small price difference.

Always use only the cleaning agents the manufacturer approves; mixing household chemicals can create harmful fumes, and some agents damage plastic or the mist element. Unplug the unit before cleaning, never immerse the base, and rinse well so no residue goes into the air.

Safety and hygiene basics

Electricity and water are a combination that calls for care. Place the humidifier on a stable, level surface that water will not damage, keep the cord away from where liquid could drip and plug it into an outlet that suits the manufacturer’s instructions. Keep the unit and cord out of reach of children and pets. A unit that leaks, sparks, smells of burning or overheats should be unplugged and checked by the manufacturer or a qualified professional.

Humidity itself can cause problems if it is too high. Condensation on windows, damp walls and a musty smell can signal over-humidifying. A hygrometer helps you stop before the room gets too damp. If anyone in the home has asthma, allergies or other respiratory conditions, ask a doctor about humidity levels and humidifier use, because we make no medical claims here.

For babies, the same principles apply with extra care: keep the unit out of reach, follow the manufacturer’s placement guidance and ask your pediatrician about nursery humidity. Our guide to cool mist options for nursery comfort covers that setting in more detail.

Noise, light and placement

Noise claims range from 21 to 28 dB in these titles. For context, a quiet bedroom may measure in the low 30s dB, so a unit at the low end may be hard to notice, but the claim is the maker’s number, and gurgling sounds or fan noise can differ from a steady decibel reading. Place the humidifier on a hard, level surface a few feet from the bed, at roughly knee-to-waist height, not directly on a pillow-side table where mist can land on bedding.

Night lights and displays can disturb sleep. Look for a unit with a light you can switch off. If mist forms a puddle around the unit, move it or lower the setting, since moisture on furniture can warp finishes.

For more on what to look for in a unit that works well overnight, see our roundup of quiet overnight cool mist humidifiers, and for bigger spaces, the guide to cool mist humidifiers for large rooms.

Water type and mineral buildup

Tap water contains minerals. In an ultrasonic unit, those minerals can come out as a white dust, and in any unit they can leave scale on the tank and the mist element. Distilled or demineralized water reduces buildup but costs more and may not be what the manufacturer recommends, so read the manual. Some units use filters or cartridges; if so, replacement is part of the running cost.

Scale is easier to remove when it is fresh. A quick rinse and wipe daily prevents it from hardening. If you see pink or slimy film, clean thoroughly and consider whether the unit is being emptied often enough.

When comparing the cost of ownership, add the water: a unit that uses roughly 1 liter a night means about 30 liters a month. If you buy distilled water in gallons at some price, you can estimate the monthly cost from your own local price, which we do not quote here.

Mistakes buyers make

• Trusting coverage numbers. A coverage claim is a ceiling, not a promise for your room.
• Buying the smallest tank for a big room. It will run dry on higher settings.
• Skipping the cleaning routine. Stagnant water is the main hygiene risk.
• Using unapproved cleaners or oils. Both can damage the unit and may irritate people or pets.
• Running without a hygrometer. You may over-humidify without noticing.
• Ignoring the app dependence. Smart features are convenient until the app changes.

If budget is your main constraint, our list of inexpensive cool mist humidifiers compares cheaper units, and our guide to easy-to-clean top-fill humidifiers goes deeper on cleaning design.

Verdict

For a large bedroom, the 6-liter class is where this set makes the most sense: the BREEZOME for the lowest price tier, the DREO HM524 for a mid-range option with a model number you can look up, and the Levoit 6.2L for app control at the premium tier. The Lacidoll 8L suits very large or open rooms if you accept a heavier tank and no noise figure in the title. The Levoit NeoClassic 450 is the quiet-claim pick for a mid-large room, and the 2.5-liter Levoit and 3.6-liter Homvana are better suited to smaller bedrooms than the “large room” wording suggests.

Whichever you choose, read the manual’s cleaning section before buying and plan a daily empty-and-dry routine.

Frequently asked questions

How big a humidifier tank do I need for a large bedroom?

Tank size alone does not decide coverage, because output per hour varies by model. A practical approach is to look at the listed runtime and the tank volume together: dividing liters by hours gives the water used per hour at the lowest setting, and higher settings use more. For a large bedroom you usually want a tank that lasts a full night on a medium setting, and a coverage claim you have checked against the manufacturer’s manual.

Why does a top-fill humidifier count as easier to clean?

Top-fill designs let you pour water in without flipping the tank, which reduces spills and lets you rinse the tank more easily. Easy cleaning also depends on a wide tank opening, few small crevices, and parts you can reach by hand. Top fill helps with refills, but cleaning access still varies, so look at the photos and the manual for how wide the opening is and which parts come apart.

How often should I clean a humidifier?

Follow the manufacturer’s instructions, which commonly call for emptying and drying the tank daily, rinsing parts regularly and doing a deeper clean about weekly, using only cleaning agents the manual allows. Standing water can grow microbes, so do not leave water sitting for days. If the manual is unclear, ask the seller or choose a model with clear cleaning guidance.

Is it safe to use essential oils in these humidifiers?

Several titles mention an essential oil tray or diffuser feature, but safety depends on the oil, the amount, and who is in the room. Oils can irritate lungs, skin or eyes and can be harmful to some pets and young children. Use oils only if the manufacturer allows it, keep to the tray if one is provided and ask your doctor or veterinarian if anyone in the home has a respiratory condition or a pet.

Do cool mist humidifiers leave white dust?

Ultrasonic models can spread minerals from hard water as a fine white dust on nearby surfaces. Using the water type the manufacturer recommends, such as distilled or demineralized water if they suggest it, and cleaning scale from the tank can reduce this. A hygrometer helps you avoid over-humidifying the room, which can cause condensation on windows and walls.