Best Seller Developed by allergists
 4.8 | 140,000+ Happy Customers
Product Title

Heimly™ Cat Allergen Neutralizing Diffuser

check Science-backed Diffuser that neutralizes airborne Cat allergens.

check 92% of users feel relief within 48 hours

check Drug-free and non-toxic. Safe around pets, adults, and kids.

check Just Plug it in and let it do the work

check Not satisfied? Our product is backed by a 90 Day Money Back Guarantee

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90-Day Money Back Guarantee

Thousands of 5 Star Reviews

Allergen-Free Home Guaranteed

We offer free tracked shipping on all orders.

All orders are processed by our fulfilment team within 24  hours.

We are currently experiencing high volume of orders so delivery times, depending on your location, range from 3-5 days.

We've made returning products super easy. Simply contact us support@heimly.co and we'll handle everything

Heimly uses proprietary AeroShield technology that releases proteins that bind to airborne cat allergens and neutralize them 24/7, ensuring your home is allergen-free around the clock.

Most Heimly users notice a clear reduction in allergy symptoms within 24–48 hours. For best results, keep it plugged in.

One Heimly device covers one room up to 400 sq ft. One refill lasts 32 days with continuous use.

Our allergen neutralizing solution contains: 

Distilled water, Sodium Chloride, Glycine, Leucine, Sodium Benzoate, Potassium Sorbate, Silica 

it's odorless and safe around cats, dogs and kids

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Trusted by 140,000+ Customers

  • I love my cat, but the allergies were killing me. Within a couple of days of plugging in Heimly, I wasn’t constantly sneezing anymore. Now I can actually relax at home without feeling congested. I even ordered more units to cover the other rooms, huge difference.

    Barbara Catherine, Texas

  • I didn't want to tell anyone that I had cat allergies because I was embarrassed by my constant sniffling around felines. I ordered Heimly because I was desperate. It came quickly, was easy to use, silent and no weird smell at all. No more nighttime congestion after a week. I haven't had a stuffy nose in 6 weeks now, even when my friends bring their cats over. A lifesaver!

    Christina Johnson,, Illinois

  • I was waking up every morning with congestion and couldn't figure out what was going on until I realized it was cat dander from my neighbor's cats coming through the vents. We tried air purifiers and allergy pills that didn't work, but Heimly made a difference in just a few days. Not a single morning sneeze after 4 days. I can finally breathe soundly again!

    Roy Donaldson New York

    Put an end to cat allergies once and for all.

    Traditional allergy treatments only mask the symptoms you feel, not the cat dander hiding deep inside your carpets, upholstery, or air vents.

    Doctors prescribe expensive medications for temporary relief and rely on recurring visits to keep making money.

    Heimly works differently. Using advanced allergen neutralization technology, it continuously disperses protective compounds that are 100% safe for humans and pets but neutralize 100% of airborne cat allergens at the molecular level, transforming your entire home into an environment where cat allergies simply can't thrive.

    End Cat Allergies Today

    Cat Allergens Are Always There Even When You Can't See Them

    Cat dander isn't just pet hair. It's made of microscopic particles like skin flakes, saliva proteins, and allergen waste that circulate through your home every day.

    Even in clean spaces, these particles settle into your bedding, furniture, and carpets — constantly getting released back into the air.

    That's why symptoms like sneezing, congestion, and irritation never fully go away.

    A Smarter Way to Handle Cat Allergies

    You've tried air purifiers, allergy pills, and expensive treatments. They all do the same thing - treat symptoms while cat allergens keep circulating.

    Heimly is different. It neutralizes cat allergens at the molecular level before they trigger your reactions. No more morning congestion. No more avoiding cats.

    It works automatically and invisibly - giving you back the comfort you deserve in your own home.

    Over 214,000 customers have discovered what it feels like to breathe freely around cats again. Many wish they'd found Heimly years ago.

    Start Breathing Easy Today

    Relief From Cat Allergies in 3 Simple Steps

    Heimly works quietly in the background to help reduce cat allergen exposure — so your home feels comfortable, peaceful, and easier to breathe in.

    1

    Plug it in

    Place Heimly in the room where cat allergens bother you most. It starts working immediately — no setup, no noise, and nothing to manage day to day.

    2

    Cat allergen protection fills the room

    Heimly continuously disperses its formula throughout the space, helping neutralize airborne cat dander and feline allergens before they keep circulating.

    3

    Breathe easier every day

    As allergen exposure drops, your space feels more comfortable. Replace the refill every 30 days to maintain protection.

    Continuous cat allergen protection. Zero daily effort. Designed for homes with cats or frequent feline visitors.

    Customer satisfaction is our #1 priority

    We make sure you are happy with your new product, you will love it, but in case you don't, you can simply return it within 90 days and we will give you a full refund its that simple.

    Try Heimly Risk-Free

    Frequently Asked Questions

    Heimly uses advanced allergen neutralization technology that continuously works throughout your space. These compounds help reduce cat allergens primarily proteins like Fel d 1 found in dander and saliva—supporting a cleaner, more comfortable home environment where you can breathe easier.

    Most customers notice improvements within the first 24 hours - fewer sneezes and less eye irritation. By day 3, congestion starts easing and sleep improves. Full benefits typically develop over 5 days of continuous use.

    Heimly is completely odorless during normal operation. The neutralizing compounds are undetectable to humans and pets. If you notice any unusual smell, please contact our support team for assistance.

    No! Keep Heimly running 24/7 for continuous protection. Cat allergens (like dander) stay in the air and on surfaces all day, especially if you have a cat at home. Running the device continuously helps reduce these allergens and keeps your air cleaner. It’s especially important at night, when you’re in close contact with bedding where allergens can build up. The device is designed for continuous use and consumes minimal energy.

    Replace the neutralizing compound refill every 30 days for optimal effectiveness. We recommend setting up a subscription to ensure you never run out of protection.

    Yes, Heimly is completely safe for families. The neutralizing compounds are non-toxic, drug-free, and specifically designed to only target dust allergens - not humans or pets.

    Air purifiers try to capture particles after they're already airborne. Heimly neutralizes allergens at the source, making them harmless even if they remain in your space. Plus, there are no filters to replace or loud fans running constantly.

    Absolutely! Many customers use multiple units - one per room where they spend significant time. Each unit treats approximately 300 square feet effectively

    • 5 stars: 14 (82%)
    • 4 stars: 3 (18%)
    • 3 stars: 0 (0%)
    • 2 stars: 0 (0%)
    • 1 star: 0 (0%)
    T
    Tracy B

    My mother-in-law has two Persian cats and expects family dinners at her house every Sunday. My allergies made these visits torture - I'd be sneezing and congested for days afterward. Started bringing a portable Heimly unit and setting it up when we arrive. Now I can actually enjoy family time instead of counting minutes until I can leave

    D
    Derek S

    Moved into a rental house and discovered the previous tenants had multiple cats. Despite professional cleaning, the dander embedded in carpets and vents was triggering daily reactions. Landlord wouldn't replace carpeting but agreed to let us try solutions. Three Heimly units strategically placed have made this house livable. Lease renewal is no longer a question

    L
    Linda P.

    My teenage daughter's best friend has cats and she was missing out on so many social activities because of her allergies. Sleepovers were impossible, study sessions had to be at our house only. We tried Heimly in her bedroom first, then got a portable one for visits. Now she's back to having a normal teenage social life without constant medication

    C
    Carmen L.

    Started a new job at an animal shelter and didn't realize how much cat exposure I'd have daily. Within a week I was miserable - constant sneezing, red eyes, couldn't focus on training. My supervisor suggested Heimly for the cat room and break area. It's been three months and I've gone from barely surviving my shifts to actually looking forward to working with the cats

    J
    Jake M.

    My cat-obsessed girlfriend and I were at an impasse. She had four cats and I couldn't spend more than an hour at her place without my eyes swelling shut. We were talking about breaking up because neither of us wanted to compromise. Found Heimly online and figured it was worth a shot before ending a great relationship. Two months later I'm practically living there and the cats have accepted me as part of their family

    M
    Maria R

    I'm a professional pet sitter specializing in cats, but developed severe allergies in my 30s that threatened my entire career. I was spending more on allergy medications than I was earning some months. Clients were understanding, but I could see their concern when I'd arrive already sneezing from previous appointments.
    My allergist suggested immunotherapy, but that would take years and cost thousands I didn't have. I was seriously considering changing careers when I found Heimly. The science made sense - neutralize the allergens at the source instead of just treating my body's reaction.
    I started by using it in my own apartment to create a recovery space between client visits. Within two weeks, I noticed I wasn't coming home completely miserable every day. Then I invested in a second unit that I bring to longer sitting assignments.
    It's been eight months now and I'm back to loving my work. I can spend full days with multiple cats without needing breaks every few hours. My clients have noticed I'm more relaxed and engaged with their pets. Some have even asked what changed because their cats seem more comfortable around me too.
    This device literally saved my career and my passion. I've recommended it to every pet professional I know, and several have had similar success stories. Worth every penny for anyone whose livelihood depends on being around cats

    B
    Brian K.

    Inherited my grandmother's house along with her two cats. Couldn't bear to rehome them but my allergies made living there miserable. Three Heimly units throughout the house have made it possible to honor her memory by caring for her beloved pets while actually enjoying my inheritance

    N
    Nicole S.

    Dating was complicated because I'd have to ask if people had cats before going to their place. Embarrassing and limited my social life. Since getting Heimly for my apartment, I have a safe space to return to after cat exposure, and the reactions are much milder now. I can actually date cat owners

    R
    Robert K

    My son desperately wanted a cat but his allergies were severe. Doctors said it was impossible. We got Heimly first, let it run for a month, then brought home a kitten. He had minor reactions the first week but now they're best friends. Watching him play with Mittens without constantly sneezing brings tears to my eyes

    A
    Amanda F.

    Apartment building allows pets and there are cats everywhere in the hallways and courtyard. My allergies made it impossible to enjoy common areas or even walk to my car without reactions. Heimly in my apartment has created a safe haven where I can recover from exposure and sleep peacefull

    T
    Thomas H.

    My elderly mother loves cats but developed allergies in her 70s. She was heartbroken about giving up her companion of 10 years. We tried Heimly in her apartment and within a month she could cuddle Whiskers again without wheezing. The joy on her face when she realized she could keep her cat was priceless

    D
    Dr. Michelle C

    Work at a veterinary clinic where cat dander is everywhere. Was taking antihistamines daily just to do my job. Got Heimly for the break room and my office. Now I can examine cats without immediately reaching for tissues. My productivity has improved dramatically and I actually enjoy working with felines again

    J
    Jessica L

    I've been allergic to cats since childhood - watery eyes, sneezing, the whole nightmare. My boyfriend has two Persian cats and I could barely visit his apartment. We tried everything: air purifiers, allergy pills, even considered rehoming the cats. Heimly was our last hope before that drastic step. Within 3 weeks I could stay overnight without reactions. Six months later, I moved in and we're planning to get married!

    D
    Danielle F

    My daughter can finally have sleepovers at friends' houses with cats. Life-changing

    C
    Chris D.

    No more avoiding cat cafes. This thing actually works. Silent and effective

    D
    David R

    My cat allergies disappeared after 2 weeks. I can actually pet my neighbor's cats now!

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    Jennifer M.

    Finally can visit my sister who has 3 cats! No more itchy eyes or sneezing fits

    Try Heimly Risk-Free