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Levoit is a big name in the air purifier universe, with a dedication to 3-stage, true-HEPA filtration, and various modern features. For safe, clean air at home or work, Levoit is a great place to begin. We have reviewed the H133 model, a highly-rated air purifier with excellent user features and impressive certifications for clean air in 2020.

Our review covers every detail from the filtration system to the sound level, complete with a comparison with other Levoit models we have reviewed in the same family, the H131 and H132.

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What is the Levoit H133 Air Purifier Best For?

Asthma and allergies: the Levoit H133 is excellent for relieving asthma and allergy symptoms thanks to the true-HEPA filtration. What’s more, it is completely ozone-free, an excellent feature for asthmatics who are triggered by ozone emissions from ionizers. Plus, the Auto mode senses when extra allergens are present in the air, and increases the fan speed to get rid of them more quickly. Check out our review of the best air purifiers for allergies (opens in a new tab). 

Bedrooms: this is an excellent bedroom air purifier because the LED lights can be turned off, and “sleep” mode uses the quietest fan speed. Even light sleepers can rest undisturbed while the air purifier keeps their environment clear of allergens. 

Household and pet odors: the activated carbon filter along with the Auto mode ensures pet-related and household odors are heavily reduced for a fresh environment. Many customer reviews praise the H133 for reducing cat litter, cigarette smoke, and cooking odors effectively.

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Size, Weight, Coverage, and Ratings

CADR: The LV-H133 has an overall CADR rating of 235 cubic feet per meter, but does not offer individual CADR ratings for particular allergens.

CADR refers to “clean air delivery rate” and indicates how fast the air purifier takes to clear a certain room size.

Size: 25.4 x 15 x 14.5 inches 
Weight: 20.4 pounds 
Coverage: up to 538 square feet (large rooms)
Energy-Star certified? Yes

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Filtration System

The H133 features a standard 3-stage filtration system with nothing fancy or out of the ordinary. However, it is a thorough and effective system with a true-HEPA filter (catches 99.97% of particles as small as 0.3 microns), pre-filter, and activated carbon filter. The filters are cylindrical and sit neatly inside the casing, with the air intake directly outside toward the bottom of the unit (the air outlet is at the top of the unit).

Pre-filter: catches the larger particles such as dust and pet hair so the true-HEPA filter can remain cleaner and more effective for longer

True-HEPA filter: catches the smaller particles such as mold spores, dander, and pollen 

Activated carbon filter: neutralizes pet, cooking, and smoke smells 

Does the Levoit H133 have an Ionizer?

No, the LV-H133 does not have an ionizer or a UV-C light, making it 100% ozone-free. This is excellent for asthmatics and people who have small pets at home who may be seriously harmed by ozone in their environment. 

Style, Operation, Modes, & Features 

The LV-H133 is a cylindrical unit with a control panel situated at the top, with clearly-marked symbols and indicator lights. The LED ring surrounding the controls is an air quality indicator light that changes color according to how contaminated the air is at the time. It’s an easy unit to operate, with simple one-touch buttons.

Air Quality Indicator and Auto Mode: Auto mode senses the level of contamination in the air and changes the fan speed (low, medium, or high) accordingly. You can also opt to change the fan speeds manually instead.

Timer: program the unit to run for anywhere between 1 and 12 hours before switching off automatically to save power

Sleep Mode: uses the lowest fan speed to reduce noise at night 

Dimmer light: this is one of the best user features, as it allows you to turn off the LED lights on the display panel so your bedroom isn’t flooded with sleep-disturbing light 

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Maintenance & Filter Requirements 

The LV-H133 doesn’t come with many out-of-the-ordinary maintenance requirements, but it does require that you clean the dust sensor. This is easy and involves no more than a quick wipe with a damp cotton bud.

How often do the filters need to be changed?

The filter is one single unit comprising of the three stages, which makes things easier (and cheaper) when it comes to replacing it. The filter should be replaced every 6-8 months but this may vary depending on how contaminated the air is. If you notice that the unit isn’t clearing odors as efficiently as it usually does, the operation is louder, or the filter looks very dirty and clogged up, it’s time to switch it out for a fresh filter.

Can the filters be cleaned or washed?

You can’t wash the filter, but you can give the exterior (the pre-filter) a gentle clean with your vacuum cleaner brush attachment. This will help to lengthen the filter’s lifespan by getting rid of large dust and pet hair clumps.

Where can I get replacement filters for the H133 and how much are they?

You can find filter replacement packs for the lowest price on Amazon here.

Noise and Light

Levoit has done well to create a discreet air purifier, with a low noise and light profile to please even the most sensitive of users. The overall noise level is less than 54 decibels, which is equivalent to moderate rainfall, and even quieter when on the lowest fan speed during Sleep mode. The LED lights on the control panel can be switched off with a simple press of a button, great for people who need total darkness at night.

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H133 Air Purifier vs. LV-PUR131 & LV-H132

Levoit LV-PUR131

The LV-PUR131 is a rectangular-shaped unit that caters to rooms up to 360 square feet compared to the H133’s 538 square foot rating. It has the same 3-stage filtration unit, sleep mode, auto mode, LED off function, air quality indicator, and timer.

The filter replacement requirements are the same (every 6 months, approximately), but the LV-PURE131 filters are ever so slightly cheaper. Note that you can also opt for a WiFi-enabled LV-PUR131 option if you like to control the unit from afar.

The LV-PUR131 is better suited to smaller rooms and slightly smaller budgets (only by a marginal price difference).

Levoit LV-H132

The LV-H132 is similar in shape (cylindrical) and overall design, with the control panel at the top of the unit. However, it caters to a much smaller room size of 129 square feet (about four times smaller than the H133’s max. space) and boasts a far smaller price tag as a result.

However, this is a much simpler model in terms of controls, as it doesn’t have an auto mode, sleep mode, or timer as the H133 has. It has 3 fan speeds, a filter change indicator light, and a nightlight on/off button to control the blue feature light. The filtration system is the same as the H133 (pre, true-HEPA and carbon filters), and it has the same filter change requirements (6-8 months).

The LV-H132 is best suited to small rooms, smaller budgets, and those with simple needs when it comes to features. 

Levoit H133 Pros & Cons

Pros 👍
✔ True-HEPA, ozone-free filter
✔ Clears asthma allergens effectively
✔ Reduces odors effectively

Cons 👎
✘ Reports of strange odor emitting from the unit
✘ Reports of a high-pitched noise

Review Verdict

As many customer reviews agree, the Levoit H133 is a great air purifier for asthmatics, allergy sufferers, and homes that need a little help in the deodorizing department. If after reading our Levoit H133 review you’d like to know more, check it out on Amazon in this link.

Frequently Asked Questions

Why is there a strange smell coming from the unit?

A few lower-star reviews mention that an odd odor emitted from their H133 unit. According to Levoit, this might be due to the filters being dirty and in need of replacing, or as a result of mildew growing on the filters.

What is causing the high-pitched noise?

A few customers who reviewed the Levoit H133 found that there was an annoying high-pitched noise coming from the unit. Levoit states that this could be due to a dirty filter, something stuck in the unit, or the filters not being positioned properly in the casing.

Can the H133 remove mold spores?

Yes, since mold spores are between 3-100 microns in size, and this unit captures particles as small as 0.3 microns. However, if you have a serious mold issue, an air purifier will not solve the problem as you have to solve the mold issue at the source.

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