Shop
  • Deals
  • Deal checker
  • Black Friday
  • Buying guides
  • Brands
  • Stores
Travel
  • Flight deals
  • Hotel deals
Company
  • Research
  • Press
  • deal.ai apps
Black Friday 2026
  • Walmart
  • Best Buy
  • Target
  • TVs
  • Laptops
  • Headphones
  • Apple
  • Gaming
  • Vacuums
  • Kitchen
  • Toys
  • Smartwatches
  • Tablets
  • Furniture
  • Mattresses
© Deal.ai Inc.
TermsPrivacy
Deal.ai › Air Purifiers
Alen
Alen 25i HEPA Air Purifier

Alen 25i HEPA Air Purifier

4.3(3 ratings)

Best price now

$179.00at WalmartObserved at 10:42 PM

Compared across 6 stores. Prices are checked against each store and labelled with when.

Visit Walmart

Ask our agent about this product

It checks today's price at every store, compares the alternatives and answers in about a minute.

Enter to send, Shift+Enter for a new line

Our take on the Alen 25i HEPA Air Purifier

The Alen BreatheSmart 25i is a compact True HEPA air purifier rated to clean up to 800 sq ft once per hour, or 400 sq ft every 30 minutes. It runs at 20 dB on low and 40 dB on high, has four fan speeds with automatic adjustment, and pairs with the Alen Air app for scheduling and filter status. It uses no ionizer and produces 0 ppm ozone, and Alen backs it with a lifetime guarantee when you keep up filter replacements. At $165.00 at eBay as of November 7, 2026, it sits at the low end of its recent range across 7 stores.

Best forBedrooms, nurseries and dormsHome offices and small rooms up to 400 sq ftAllergy and dust sufferersBuyers who want app control and auto mode
Pros
  • True HEPA captures 99.9% of particles down to 0.1 micron
  • Very quiet at 20 dB on the lowest speed
  • Compact footprint suits bedrooms and small rooms
  • Auto mode with color rings shows air quality at a glance
  • No ionizer, 0 ppm ozone, ENERGY STAR certified
  • Lifetime guarantee with regular filter replacement
Cons
  • One owner found it noisy in a small bedroom and weak on dust and odors
  • App setup and device registration reported as difficult
  • App software update stalled for at least one buyer
  • Limited color choices and not offered in bundles
  • Coverage drops to 400 sq ft for a full air change in 30 minutes

Alen 25i HEPA Air Purifier prices at every store

  • Alen | StoreNew

    In stockReturn policy

    $179.00Observed at 10:42 PM
    Visit Alen | Store
  • WalmartNew

    In stockSold by AlenReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $179.00Free shippingObserved at 10:42 PM
    Visit Walmart
  • Lowe'sNew

    In stock

    $179.00Free shippingObserved at 10:42 PM
    Visit Lowe's
  • Ace Air PurifiersNew

    In stock

    $189.00Free shippingObserved at 10:42 PM
    Visit Ace Air Purifiers
  • SmartHomeValueHubNew

    In stockReturn policy

    $277.45Observed at 10:42 PM
    Visit SmartHomeValueHub
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $194.00Free shippingObserved at 10:42 PM
    Visit Amazon

Also available at

  • eBayCheck price at eBay
  • Aeris HumidityCheck price at Aeris Humidity

Store links may earn us a commission. Some prices via Klarna.

Alen 25i HEPA Air Purifier price history

Lowest price we've seen: $179.00 on Nov 8 at Lowe's. Tracked across 3 stores since Nov 8.

What reviewers say

Owners mostly describe the 25i as quiet, compact and effective at cutting dust, sneezing and odors. Complaints center on app setup and registration, with one reviewer finding it noisy and ineffective in a small bedroom.

What people mention
  • NoiseMixedMost owners call it whisper-quiet at 20 dB on low, but one found it noisy in a small bedroom.
  • App setupCriticisedRegistering the purifier and getting the Alen Air app working was described as a nightmare, and one update would not finish downloading.
  • Dust and allergiesPraisedOwners report less dust and fewer sneezing and allergy symptoms, though one reviewer saw no improvement.
  • OdorsPraisedBuyers say it cuts cooking smells and litter box odors.
  • SizePraisedThe compact body fits bedrooms, nurseries and small rooms.
  • Air quality displayPraisedThe color-changing ring makes current air quality easy to read.

From Alen | Store

  • Purifies up to 800 sq ft every hour or 400 sq ft every 30 minutes
  • Captures 99.9% of airborne particles as small as 0.1 micron
  • Quiet operation: 20 dB on lowest speed, 40 dB on highest
  • Four fan speeds with automatic speed adjustment and 5 color rings
  • Smart sensors and Alen Air app for real-time air quality monitoring and control
  • ENERGY STAR certified; 0 PPM ozone; no ionizer
Guarantee
Lifetime Warranty; Forever Guarantee with product registration and active air filter subscription; lifetime guarantee policy requires use of Alen filters
Returns
60-Day Trial
Shipping
FREE 2-Day Shipping
In the box
BreatheSmart 25i Air Purifier, Long-Lasting HEPA Filter, Power Adapter, Quick start guide, User Manual

About the Alen 25i HEPA Air Purifier

The whisper-quiet Alen BreatheSmart 25i packs all the power and smart features you need into our most compact size. Perfect for purifying a small living space or amplifying your current purifier setup, the 25i is sized to give you ultimate flexibility.

Advanced Filtration: Choose between Essential, Advanced and Ultimate filters with True HEPA efficiency to capture 99.9% of particles, perfect for tackling dust, allergens, and other pollutants.

Optimized for Bedrooms, nursery, and dorms: Purpose-built for focused work, the 25i purifies up to 800 sq ft every hour or 400 sq ft every 30 minutes, keeping your home office clean and quiet.

App Control: The Alen Air app offers remote control, scheduling, and filter status updates, while Auto Light Mode dims panel lights in low-light environments.

Built to Last: Backed by Alen’s Forever Guarantee with regular filter replacement, this purifier offers reliable performance and lifetime peace of mind.

What buyers say

Buyers like
  • Very quiet operation
  • Compact size, good for bedrooms and small rooms
  • Reduced dust and helped with allergies and sneezing
  • Color-changing rings indicate air quality
  • Easy filter subscription
  • Cut down on odors, including litter room and cooking smells
Buyers complain about
  • One reviewer found it noisy in a small bedroom and felt it didn't clean dust and odors well
  • Registering the machines and the app described as a nightmare
  • Wishes the 25i were included in bundles and offered in more colors
  • App software update would not finish downloading

Specifications

color
OtherSource
configuration
AdvancedSource
actual_color
AdvancedSource
Actual Color
EssentialSource

Questions and answers

Is the Alen 25i worth it?
At $165.00 at eBay as of November 7, 2026, it is a low-cost entry to a True HEPA purifier with app control and a lifetime guarantee. It suits a bedroom or small room better than a large open space.
How large a room can the 25i clean?
Alen rates it for 800 sq ft with one air change per hour, or 400 sq ft every 30 minutes. For allergy relief, treat 400 sq ft as the realistic limit.
How loud is it?
Alen lists 20 dB on the lowest speed and 40 dB on the highest. Most owners call it quiet, but one found it noisy in a small bedroom.
Does it produce ozone?
No. It has no ionizer and Alen lists 0 ppm ozone, and it is ENERGY STAR certified.
What comes in the box?
The purifier, a long-lasting HEPA filter, a power adapter, a quick start guide and a user manual.
Which filter should I choose?
Alen offers Essential, Advanced and Ultimate True HEPA filters. All capture 99.9% of particles; the upgrades add more carbon for odors and gases.
Where is the Alen 25i HEPA Air Purifier cheapest?
At Walmart, for $179.00, as of our latest check.
What do buyers say about the Alen 25i HEPA Air Purifier?
Rated 4.3 out of 5 from 3 ratings. Buyers like: Very quiet operation; Compact size, good for bedrooms and small rooms; Reduced dust and helped with allergies and sneezing. Common complaints: One reviewer found it noisy in a small bedroom and felt it didn't clean dust and odors well; Registering the machines and the app described as a nightmare.
Where can I buy the Alen 25i HEPA Air Purifier?
8 stores we checked sell it, including Alen | Store, SmartHomeValueHub, Walmart, Lowe's, Ace Air Purifiers.

Shoppers also compared

  • 2
    25i HEPA Air Purifier
    25i HEPA Air Purifier
  • L
    Levoit Core Mini Air Purifier with Night Light
    Levoit Core Mini Air Purifier with Night Light
  • C
    Coway Airmega 150
    Coway Airmega 150
  • H
    Honeywell HPA060
    Honeywell HPA060
  • S
    Smartmi Air Purifier P1 with HEPA Filter
    Smartmi Air Purifier P1 with HEPA Filter
  • C
    Clorox Tabletop Air Purifier with HEPA Filter
    Clorox Tabletop Air Purifier with HEPA Filter
  • D
    DH Lifelabs Sciaire Essential Air Purifier with HEPA Filter
    DH Lifelabs Sciaire Essential Air Purifier with HEPA Filter
  • B
    Blueair Blue Pure 211i Max HEPASilent Air Purifier
    Blueair Blue Pure 211i Max HEPASilent Air Purifier

Stores we've priced the Alen 25i HEPA Air Purifier at

  • Lowe's deals and prices