Modern Castle is supported by readers. When you buy with our links, we may earn a commission. Learn more

Tenergy Renair Air Purifier Review

Derek Hales

Written By: Derek Hales

Updated on:

Budget Air Purifier


Tenergy Renair Air Purifier

The Tenergy Renair air purifier is a solid option for a medium-sized air purifier that is quiet, but also effective to clean the air. It offers 4-stage filtration and 7 LED color options, with a sleek white body and simple aestheticCheck Price


  • Has a quiet mode that can clean at only 28 decibels
  • 4-stage filtration removes up to 99.97% of particles in the air
  • Uses the natural power of negative ions help purify the air by bonding to airborne particles


  • Has a maximum area coverage around 210 square feet, may not be suitable for larger areas
  • Filter only lasts 6 months

Tenergy Renair Design

The Tenergy Renair air purifier doesn’t share many aesthetic similarities with traditional air purifiers, but it’s hardly a complaint. The Tenergy purifier has a matte white body with sleek rounded edges and a silver top.

Tenergy Renair air purifier
Tenergy Renair air purifier

The top houses all of the controls, making it easy to adjust and change the Tenergy as needed.

Tenergy Renair air purifier LED controls
Tenergy controls

There is a touch-control button for the following features:

  • Fan speed (3 speeds)
  • Night mode (on / off)
  • Night light (on / off)
  • Negative Ionizer (on / off)
  • Replacement filter notifier
  • Power (on / off)

There is a glowing LED that enables all of these buttons to be illuminated so they’re easy to see, even in the dark.

What’s on the bottom?

The bottom of this air purifier houses the air vents which allows the purifier completely treat its surroundings.

Tenergy air purifier air vents

RELATEDSee all the air purifiers we’ve tested here

Filtration Stages

The Tenergy Renair has a single filter, but one with four built-in stages. This filter uses the following process:

  • Preliminary pre-filter – captures larger debris like pet hair and dust
  • True HEPA – captures smaller particles including pollutants and allergens, like pollen
  • Activated charcoal – great for removing odors, like smoke, food, or other foul smells
  • Anti-bacterial layer – great for disinfecting airborne germs
Tenergy air purifier filter

Size and Dimensions

For an air purifier that can tackle rooms up to 210 sq. ft., it is relatively small.

The Tenergy Renair air purifier is:

  • Diameter: 8.6”
  • Height: 18”
  • Weight: 6.6 lbs.

This air purifier is lightweight and easy to move around as needed or to be taken into a different room. The smaller size allows it to sit comfortably on a tabletop, counter, or in a corner of your room.

Accessories & Parts

The Tenergy Renair air purifier doesn’t come with any fancy accessories or add-ons.

The original box includes the following:

  • Tenergy Renair air purifier
  • True HEPA filter
  • User manual

This purifier comes with a built-in night mode, LED color options, and 4-stage filtration.

Tenergy Features

The Tenergy Renair has a number of nice features that help it to stand out against other air purifiers.

Tenergy air purifier nightlight mode
Tenergy air purifier nightlight mode

Some of the most notable features include:

  • 4-Stage Filtration: The Tenergy Renair air purifier uses a filter with 4-stages that helps to treat particles of all sizes from the air. There is a preliminary pre-filter for larger debris like pet hair, a True HEPA filter, an activated charcoal filter for odors, and an anti-microbial filter to the most finite germs.
  • Night Mode: When in Night Mode, the Renair purifier will operate as low as 28 db.
  • Color Settings: The Tenergy Renair has two options; option 1 is to glow blue non-stop or option 2 is to rotate between 7 different colors for a changing aesthetic.
  • Negative Ion Generator: The Renair air purifier produces negative ions that bond to particles in the air when they meet. Once bonded, the negative helps to clear away airborne particles and drop the to the ground to be vacuumed up later.
  • 3 Fan Speeds: There are three fan speeds available with the Tenergy Renair purifier, allowing you to quickly clean a larger area or simply maintain clean air at a lower speed.

RELATEDDo air purifiers remove bad smells and odors?


Overall, the Tenergy Renair air purifier performed well. It was able to improve air quality by 50%, reducing PM2.5 particles from 3.6 down to 1.8 (within 1 hour).

Below is the full air quality improvements:

Starting Baseline

  • PM2.5: 3.6
  • PM10: 6.3
  • Particles: 139
  • AQI: 15

After 1 Hour

  • PM2.5: 1.8
  • PM10: 2.7
  • Particles: 89
  • AQI: 7

Testing Series

In order to test the Tenergy Renair air purifier, we placed the unit inside a closed bedroom (12′ x 12′).

  1. From there, we took the initial measurement of the air quality in the room
  2. Ran the Tenergy Renair for 1 hour
  3. Took a new measurement

Below, we’ve included information on the testing criteria and what defines good vs. bad air quality.

air quality index - PM 2.5 particulate matter index
Particulate Matter explained - air purifier reviews

What were the final results?

Before turning the Tenergy Renair on, our initial baseline measurements were as follows:

  • PM2.5 – 3.6
  • PM10 – 6.3
  • Particles per liter – 139
  • AQI – 15

We took these measurements using the Temtop LKC-1000S+ professional air quality detector. With this device we have the ability to get detailed measurements before and after using the Tenergy air purifier.

After running the Tenergy air purifier for 1 hour we saw a marked improvement in air quality.

  • PM2.5 – 1.8
  • PM10 – 2.7
  • Particles per liter – 89
  • AQI – 7

Setup & Usability

The setup and usability of the Tenergy Renair air purifier is simple.

How to setup the Tenergy air purifier?

It is a corded purifier so you just unbox it, remove the plastic bag from the filter, plug it in, and turn it on.

Tenergy Renair air purifier filter interior

How to use the Tenergy air purifier?

There is no setting on this unit for it to detect air quality so you’ll need to use the Renair as you see fit. You can use the touch controls to easily turn the purifier to a higher or lower fan speed.

Tenergy Renair air purifier internal fan
Internal fan that drives air across the filters

If real time air quality monitoring is important please see our Rabbit Air MinusA2 review or Rabbit Air BioGS 2.0 review.

For most homes, simply running on medium fan speed 24/7 is the best way to ensure air is always being cleaned and well circulated.

Tenergy Renair Air Purifier Maintenance

The Tenergy air purifier has minimal maintenance, mainly because the 4-stage filter is compressed into one compact filter. This filter needs to be replaced every 6 months for the best performance, but luckily it’s not too expensive.

Tenergy Renair HEPA filter
Tenergy Renair HEPA filter

You can usually find the filter for around $22 / each. With the cost of replacing this part twice a year, you can expect an annual cost of around $44 / annually.

How loud is the Tenergy?

Based on our in-home tests, at maximum airflow the Tenergy Renair air purifier is around 50 decibels of noise at high speed. At low speed, the decibel count was closer to 39 dB of noise.

Ambient noise in the room without the Tenergy running at all came in at 39 dB.

RELATEDHow to smoke in your room without smelling it

Is the Tenergy air purifier a good value?

In general, I think the Tenergy Renair air purifier is a good value.

Tenergy Renair Air purifier

The Renair was able to remove particles from the air and improve air quality.

It’s not quite as powerful as other more expensive air purifiers we’ve tested. However, given the price point, I think it still does a reasonable job.

If you have a small or medium sized bedroom it can be a great fit. Additionally, the nightlight and quiet operation are other notable features that help improve the value.

Tenergy Renair Air Purifier Specifications

Below you’ll find a complete table listing the important facts and features about the Tenergy Renair air purifier:

Width (inches)8.6" diameter
Weight6.6 lbs.
Filters4-stage filtration
Wifi CompatibleNo
Air Quality DetectionNo
Area Coverage210 sq ft.
Filter Costs$46 / annually
Returns30 Days via
Warranty2 Years (must register)
PriceCheck Price

Who Should Buy the Tenergy Air Purifier?

The Tenergy Renair is a mid-size purifier that had good performance in a medium sized room, a simple user interface, and also doubles as an air ionizer for optimal performance.

I would recommend the Tenergy Renair if you’re looking for the following in an air purifier:

  • Doubles as a negative ion generator: The Renair produces up to 6 million negative ions per second that then are distributed into the air to join with airborne particles, and pull them to the ground. Once on the ground, these particles can be vacuumed up and are no longer airborne.
  • Ultra-quiet purifier: If you’re concerned about the noise output, the Tenergy Renair outputs around 28 db when on Night Mode. This is extremely quiet for a powerful machine. By comparison, the sound of breathing would be rated at about 10 decibels, a whisper is around 20 dB.
  • Color-changing LED: The Renair has color-changing LEDs which provide a nice contracting aesthetic to the all white matte and silver body. When in Night Mode, this purifier will glow with a soft blue light and when in standard mode, it will rotate from 7 pre-selected colors.

For more information or to buy the Tenergy Renair air purifier, click here.

Good Performer, Reasonable Price
  • Design - 93%
  • Performance - 93%
  • Quality - 94%
  • Usability - 95%
  • Value - 95%


The Tenergy Renair is a budget air purifier designed for small to medium sized rooms. In our tests, it was able to improve air quality markedly within 1 hour. Controls are simple and intuitive. While the performance is not ground breaking, it’s pretty good considering the price.

About Derek Hales

Derek HalesDerek Hales is the Founder and Editor-in-Chief of He has been featured in Fast Company, Reader's Digest, Business Insider,, She Knows, and other major publications. Derek has a Bachelor's Degree in Business Administration from Kansas State University. Hales has been testing and reviewing products for the home since 2014.

Need Help? Ask Your Question Below.

2 Comments on “Tenergy Renair Air Purifier Review”

  1. I just bought this air purifier and just started using it in my bedroom.
    I like the low sound, but turn it up when I go out of room for a little more kick.
    The night mode is terrific and the lights are very soothing.
    Will be interested in seeing filter after 6 months, as there is a lot of dust and cat fur flying around my room…

    • Nice! Glad to hear you’re enjoying the Renair so far.

      You’ll be surprised at how much stuff is floating in your home.