3500 Sq.Ft Smart Scent Diffuser - HVAC System | Whole House Aroma & Hotel Collection Diffuser, Waterless Diffuser for Home Large Room, Cold Air Tech, 600mL (White)

I usually don’t do product reviews, but I really wanted to do one for this product. Last week we purchased the U5 and decided to use it as a standalone unit in the middle of our house, not plugged into the HVAC system. What an amazing machine this diffuser is! Our house is nearly 4000 ft. and now we have amazing fragrance pretty much wall wall, and the best part is the amount of oil consumption is so low that I think our small 4 ounce bottle is going to last a month or more. That’s pretty efficient! Anyway, we’ve tried everything for fragrance in this house, including plug-ins, Reed diffusers, traditional diffusers, and anything else we could think of, and nothing really worked or smelled the way we wanted. This machine does everything we need to do and it’s simply pleasant to have around. If you want a machine that’s easy to set up, low cost to operate, an extremely good at what it does. I recommend this one. And I want to emphasize that you don’t have to plug it in to your HVAC in order to feel it’s full value.

I love this! I had 4 expensive oil diffusers I bought from a retailer. They worked great until they don’t. I was great about cleaning them but they are all beyond hope. I saw this diffuser covered more sq footage and was a lot less expensive. This is very easy to set up and start using. I haven’t had it long enough to need to clean it, but all of the parts are bigger and the tubing carrying the oil is wide so it will be a lot easier to clean. I did not hook it up to my HVAC system because it’s in the attic and I did not register and download the app. You can still use the diffuser just fine using the remote and not having to set up a user ID and passcode through the app. So far it’s worked great and has kept my large living room/kitchen/entry smelling great. It is also very quiet and does not distract.

I don't write reviews often but this one is a game changer! I have a two storied house.That is roughly 2,400 sq ft. I typically keep my house very clean. But I have two dogs that are constantly running in and out of the house. So they tend to bring in grass, and they tend to smell somewhat musky when playing in the heat. I have installed this in the attic to my air handler which was very easy. At the lowest setting you can smell it the second you walk through the door. I get constant comments on how good it smells. Its always working in the background and I never have to touch it. I love it and would buy it again. I recommend this product to all my friends already. Its cheaper than having all those ugly plug in air freshener around the house which only smells when u are close to them. This item evenly distributes it among all the rooms so there are no dead zones. I highly recommend this to be installed in the air handler of the ac. Its the only true way to unlock its full potential. The casing is almost like metal and it's very sturdy and durable. The casing and the parts appear to have alot of longevity. They didn't cut corners when they made this. Best of all when I have guests coming over I can open my app up and boost up the scent a hour or 2 before guest to arrive to smell even better. It has a bright nice led screen with significant lighting for manual setting adjustments. Fyi.... to get the most out of this set your AC fan to "ON" instead of AUTO that way the oils are constantly getting pushed by the ac so you aren't wasting any fragrance. I got the white color although I don't see it because it's in my attic i do love the casing colors as well as the black. If u have candle or air freshener in ur house go ahead and trash them and get this today! Also one bottle of oil has lasted me 2 1/2 months so far. Already paying itself off in the money I've spent on candles and stuff.

Bought this scent machine really just to try something new and it has honestly exceeded my expectations. Right out of the box it looks solid and way nicer than a lot of basic diffusers I have seen. Setup was not confusing at all and honestly pretty quick once I downloaded the app and paired it. The Bluetooth controls make it easy to adjust schedules and intensity without having to stand next to it every time I want to change something. The coverage is insane. I run it in my whole main living area and it fills the space with a nice scent that actually lasts. I was worried it would be weak or too subtle, but it definitely shows up without being overpowering. I even hooked it up to the HVAC system in my house and it spreads the aroma really evenly, which is awesome. Another thing I like is that it does not leave a mess or make the room feel humid like some other diffusers I have used. It feels like I stepped into a high-end hotel lobby rather than just turning on a plug-in air freshener. Overall this has been a great upgrade to my home and I would totally recommend it to anyone who wants a sleek and powerful scent solution for big rooms.

I’ve been using this smart scent machine in my home, and overall it works very well. One of the first things I noticed is that people immediately comment on how good the house smells when they walk in. The scent coverage is strong and consistent without being overwhelming. The automatic function is a big plus. Once it’s set up, it’s pretty much set it and forget it. It runs on a schedule without needing constant adjustments, which makes it easy to live with day to day. Installation was also fairly simple and didn’t take much time. The app does its job, but it feels a bit unrefined, and the connection to the device can be temperamental at times. That said, this isn’t a huge deal because once you’ve set your schedule and scent strength, you rarely need to open the app again. There is one thing worth keeping in mind, especially if you live somewhere with cold seasons. This is unverified, but based on my experience: if you run the diffuser regularly while not using your AC and then switch over to heat in the winter, you may notice some “smoke” the first time the furnace kicks on. When I turned on my heat for the first time this season, my home filled with a noticeable amount of diffuser-oil-scented smoke. My assumption is that the oil either coated the ductwork over time or possibly made its way into the furnace, and then burned off when the heat was first used. After that initial occurrence, things returned to normal, but it’s definitely something to be aware of if you plan to leave the diffuser running year-round without HVAC airflow. Pros: • Works very well and distributes scent evenly • Guests notice and compliment the scent when entering the home • Automatic mode makes it mostly set and forget • Easy installation • Large capacity, doesn’t need constant refilling Cons: • App feels a bit unpolished • Device connection can be temperamental • Potential oil buildup in ductwork or HVAC system (unverified) • Possible scented smoke when turning on heat for the first time in winter Overall, this is a great scent machine that does exactly what it’s supposed to do and makes the house smell great. Just be mindful of how and when you’re running it if it’s connected to or near your HVAC system, especially during seasonal changes.

What is there to say about this machine that needs to be said? It is by far one of the most effective solutions I've used for aromatizing my home. As a long-time fan of incense, candles, and essential oils, the U5 quickly became my daily driver for its clean, cold-air diffusion, quiet operation in the background, and the 600mL tank, which means I'm not constantly refilling like with cheaper units. App scheduling and intensity control are dialed in. Coverage easily floods my space and then some. But honestly, what pushed this from a 4-star product to a 5-star experience was the support team, specifically, Cindy. After almost a year of daily use, my unit ran into a power issue. I reached out expecting the usual Amazon-seller runaround: slow replies, scripted responses, and possibly being ghosted eventually. Instead, Cindy responded within a day, treated me like an actual human being, and walked me through troubleshooting with real technical knowledge instead of a copy-paste FAQ. She followed up proactively, made sure I had everything I needed, and resolved the issue faster than I thought possible. In a category full of faceless overseas brands, Cindy is the kind of rep who turns a one-time buyer into a lifelong customer. Aromadd, if you're reading this, promote her, raise her, clone her. She's the reason I'll keep recommending this brand to friends and family for years. Premium product. Elite service. Highly recommend.

**I was not bribed to leave a review nor do I get anything in return for providing one. I straight up just love this machine** If you’re on the fence about buying this, do yourself a favor and make the purchase. You only get to make a first impression once and it’s truly shocking how many guests have commented on my house’s pleasant scent as soon as they walk in. It’s the same sensation as walking into a luxury hotel, which is exactly the vibe I was going for. The unit itself feels quality as the exterior panels are made of glass. No issues with loose fixtures, leaks, etc. Anyone who left a bad review claiming that the machine is “loud” is being dramatic. It’s not at all. Hooking the unit up to my HVAC was a breeze, especially because all of the conversion pieces are included in the kit. It took less than 5 minutes. Like others have said, the app could use some updating but it’s overall very easy to operate. I inquired with customer service about making an adjustment so the scent gets dispersed only when the HVAC fan kicks on — Bella was quick to respond with a video showing the setup process and even threw in a free bottle of oil to try out when I told her I was on the fence about choosing a scent. Genuinely good customer service is hard to come by these days (especially because they don’t ask for tips like every other place now) and this company’s efforts are worth noting. Thank you for actually caring. Once you have your strength settings set to your liking there isn’t much looking back. For reference, I have a 3,500 square foot house. I set my unit to disperse for 15 seconds with 300 second pauses in between. It runs daily from 9am-11pm. A 500ml bottle of oil lasts me around 4 months. I’ve had it since June 2025 and there is no residual buildup in my vent system, which was something I was worried about. I wasted so much money on candles in the past it’s not even funny. I wish I would’ve purchased it sooner. Realistically, I think Aromadd should charge more for this product because of what you’re getting in return, but I admire that they’re not in it for the money. If you look at the price history tracker you’ll see that the cost hasn’t budged at all over the course of several months, holidays included. That’s honorable. This product is great. This company is great. I convinced my nail salon to buy one (lol). You should buy one too.

WOW this unit works amazing!!! I originally purchased one unit and decided to try this unit. The updated 2025 version that covers 3,500 sq ft. This one works so good. It has a built in fan so it helps disperse the fragrance better and that’s great for me as I didn’t hook it up to my HVAC. the fan helps to move the fragrance farther and scenting our entire home. Even the rooms that are not in the main part but are off of the hallway. I also have it turned down to a lighter scenting vs the other ones that we tried. I also purchased one for a friend because she had been looking at them as well. I highly recommend this one and it’s at a great price vs others that you see online. Our house has never smelled so good! I would buy again and give as gifts for the holidays. I noticed I put my review under a different product so adding one here under the model we just bought.

A year later and my machine is working amazing I couldn’t love it more. I’m in Canada FYI. Much cheaper than buying from Aroma 360 and same result. Also Cindy was fantastic answering all of my questions and needs. The customer service is top tier. Thanks again Cindy;)

Works perfectly and my entire house smells great