Clean Air Blog

Last updated: August 2025 This is our third year running this nationwide comparison, now updated for 2025. Over that time, we’ve seen plenty of air purifiers come and go - often from brands where air quality isn’t their main focus. Some even vanish entirely, leaving users without replacement filters. That’s why we refresh this guide each year: to show which models are properly supported in New Zealand, how they actually perform, and which ones deliver the best value for clean air. How We Compare Purifiers We focus on the two figures that matter most: Clean Air Delivery Rate (CADR) and noise (dB). 💨CADR measures how much clean air a purifier produces each hour. The higher the number, the faster it cleans and the larger the space it can handle. We use this figure because manufacturer recommended room sizes are often inaccurate. 🎶Noise tells you how comfortable it is to live with. We use maximum noise levels for fair comparison, rather than the quiet “sleep-mode” numbers that hide reduced airflow. As a guide: <50 dB - relatively quiet for daytime use, fine in living areas but still very noticeable at night 50–54 dB - modest background noise, upper limit for comfortable indoor environments 55–59 dB - similar to normal conversation, very noticeable if close by 60+ dB - loud and disruptive, best avoided for long periods Together, these two metrics give the clearest picture of real-world performance: how quickly a purifier cleans the air and how comfortably it does it. Comparison Analysis (2025): Our latest update shows a clear pattern: price doesn’t always equal performance.Some premium models look impressive but move surprisingly little air, while several affordable purifiers outperform nearly everything in their range. Let’s start with the best air purifiers under $300 - where quiet, efficient performance matters. Budget Air Purifiers Under $300 (for smaller spaces, up to ~40m²) This category is aimed at bedrooms, nurseries, and smaller living areas/apartments. This is for those wanting quiet, effective air cleaning without spending a fortune. We assessed 12 models from brands such as Breathing Better, Sunbeam, Breville, TruSens and more. 🏆 Best Overall: Smart Air Sqair Key Stats: CADR: 315 m³/h (>50% higher than competitors) Noise: 23–52dB (on low, whisper-quiet) Room coverage: Cleans a 43 m² room in just 20 minutes Price: $299.99 Why we like it: The Sqair delivers the most clean air for your dollar - more than any purifier under $300 in New Zealand. Its H12 HEPA filter has a large 1.5 m² surface area (around 22 A4 pages), giving excellent capture efficiency for smoke, dust, pollen, and pet dander. It’s also 7–12dB quieter than its nearest rivals, making it ideal for bedrooms or nurseries where silence matters. And because it relies purely on proven HEPA + Carbon filtration (no ionisers, no ozone), it’s a safe, science-based choice for households with respiratory concerns or young children. 🔍 How It Compares Brand Model Max CADR  Max Noise Price Smart Air The Sqair 315m³/hr 52dB $299.99 Sunbeam Fresh Protect 193m³/hr 59dB $248.00 Trusens Z2000 190m³/hr 64dB $229.00 Breville The Easy Connect 91m³/hr 60dB $270.00 Despite being similarly priced, most competitors clean 40–60 % less air and run significantly louder. The Sqair comfortably handles rooms up to 43 m², reaching that target in just 20 minutes - while others in this range top out around 26 m².  It’s a clear reminder that price doesn’t always equal performance. Graph 1: Air purifiers under $300 in NZ (price vs max noise vs CADR). Air Purifiers $300 to $500 in New Zealand (for medium spaces, up to ~60m²) This range suits medium-sized living rooms, apartments, and shared spaces where you want strong air cleaning without excess noise. We compared 14 models from brands like Daikin, Shark, Winix, Breville, Xiaomi, TruSens and more. 🏆 Best Overall: Smart Air SA600 Key Stats: CADR: 500 m³/h, equal to the highest in this bracket Room coverage: Cleans a 60 m² room in just 18 minutes Noise: 24 – 53dB (quietest in class) Price: $439.99 Why we like it: The Smart Air SA600 packs big-room performance into a compact, low-noise design. Its dual-inlet setup and twin H13 HEPA + carbon filters deliver clean air more efficiently than purifiers twice its price. It matches the top CADR of the Xiaomi Pro 4 but runs up to 11dB quieter, making it much more comfortable for everyday use. Unlike many competitors that rely on ionisers or plasma features, the SA600 uses straightforward science. That's a powerful fan and real filters for reliable, safe air cleaning. Add its “Do Not Disturb” mode to avoid lights and child lock, and you get a purifier built for homes, offices and schools alike. 🔍 How It Compares Brand Model Max CADR  Max Noise Price Smart Air SA600 500m³/hr 53dB $439.99 Xiaomi Pro 4 Smart Air 500m³/hr 64dB $400.00 Xiaomi 4 Smart Air 400m³/hr 63dB $325.00 Shark NeverChage 5 165m³/hr 55dB* $350.00 * Noise level reported between 55–65 dB depending on the source. The SA600 offers a rare balance of high airflow and low noise, outperforming most competitors in both areas. It delivers top-tier cleaning power while remaining comfortable to live or work beside, even on full speed. By contrast, the Shark NeverChange 5 is heavily marketed, but falls short in performance. With a CADR of just ~165 m³/h, it moves a third of the clean air of the SA600, yet operates at 55dB or more. The SA600 achieves almost the same airflow at only 24dB on low speed, virtually silent! It’s a clear example of why transparent CADR data matters more than marketing labels, and why the SA600 stands out as the most capable and honest performer under $500. Graph 2: Air Purifiers $300- $500 in NZ (Price vs max noise vs CADR). Air Purifiers for larger spaces under $1000 in New Zealand (Up to ~85m²) When you’re dealing with large living areas, classrooms, clinics, or open-plan apartments, you need serious airflow without the jet-engine noise. We assessed 15 models in 2025 from brands like Sharp, Daikin, Oransi, Winix, Mitsubishi, Breville and Dyson. Performance varied dramatically - some delivered genuine whole-room cleaning, others struggled despite premium pricing. 🏆 Best Overall: Smart Air Blast Mini Mk II Key Stats: CADR: 740 m³/h highest in its class Room coverage: Cleans 85 m² in just 17 minutes Noise: 49dB max, quietest among large-space units Price: $799.99 Why we like it: The Blast Mini Mk II is built for genuinely big rooms. Its massive airflow and large H13 HEPA + optional carbon filter give it the power to handle living rooms, classrooms, or open offices with ease, all while staying impressively quiet. At just 49dB on high, it’s quieter than many smaller purifiers running on medium. Smart Air’s “fan + filter, no gimmicks” approach means there are no ionisers, plasma emitters, or inflated “air quality modes” - just straightforward, high-volume HEPA filtration that works. 🔍 How It Compares Brand Model Max CADR  Max Noise Price Smart Air Blast Mini Mk II 740m³/hr 49dB $799.99 Oransi Mod Hepa 574m³/hr 49dB $850.00 Mitsubishi ElitePure 508m³/hr 55dB $520.00 Dyson Pure Hot+Cool HP03 113m³/hr 62dB $899.00 The Blast Mini Mk II delivers both the highest CADR and lowest noise in its category, making it a standout for large spaces. The Oransi Mod HEPA is a solid performer but still trails well behind in airflow. Meanwhile, Mitsubishi’s ElitePure offers less than 70 % of the Blast Mini’s output, and Dyson’s HP03 barely registers for its price tag. Dyson’s independently tested CADR of just 113 m³/h, and at a noisy 62dB, shows how marketing can mask poor real-world performance. The Blast Mini, by contrast, backs its claims with transparent data and measurable results. Graph 3: Air purifiers $500 - $999 in New Zealand (price vs max noise vs CADR). Large & Commercial Air Purifiers over $1000 in New Zealand (Up to ~130m²) This category covers large homes, gyms, clinics, classrooms, and shared spaces - anywhere serious clean-air output is needed. We tested 15 models from brands such as IQAir, Trusens, Dyson, Breathing Better and Fellowes. Prices vary widely, and as with smaller categories, cost doesn’t always equal performance or quietness. 🏆 Best Overall: Smart Air Blast Mk II Key Stats: CADR: 950 m³/h, highest in New Zealand Room coverage: Cleans 130 m² in 21 minutes Noise: Just 43 dB, the quietest large unit around Price: $1,100 Why we like it: The Blast Mk II delivers industrial-level performance in a package that’s surprisingly quiet.At 950 m³/h CADR, it outperforms or matches high-end purifiers costing several times more - while running at only 43 dB, about the sound of a quiet conversation. It’s built around Smart Air’s no-nonsense principle: massive HEPA surface area, high airflow, and zero gimmicks With H13 HEPA and optional carbon filtration, it’s ideal for schools, fitness studios, or any environment where dependable, high-volume clean air is needed without the distraction of fan noise. 🔍 How It Compares Brand Model Max CADR  Max Noise Price Smart Air Blast Mk II 950m³/hr 43dB $1100 Trusens Z7000 930m³/hr 66dB $1830 Trusens Z6000 880m³/hr 63dB $1700 IQAir CleanZone SL 820m³/hr 56dB $11,500 Breathing Better X-Large Room Purifier 800m³/hr 70dB $1499 I-Air Pro Air Healer 600m³/hr 61dB $12,883 Dyson Purifier Hot + Cool 311m³/hr 62dB $1099 The Smart Air Blast Mk II pairs immense airflow with unmatched quietness, achieving what most large-space purifiers can’t: power and comfort in the same package. The Trusens Z7000 comes close in airflow but runs over 20 dB louder, while the IQAir focuses on the high end with specialised carbon filtration and an big price tags. At the opposite end, Dyson’s premium Hot + Cool series delivers less than a third of the airflow at very high noise levels - proof that sleek design doesn’t equal clean air. Graph 4: Air Purifiers $1000+ in New Zealand (price vs max noise vs CADR). Summary: What We Learned From the Comparisons After analysing nearly every purifier available in New Zealand, one trend is clear: the best-performing units aren’t always the most expensive. Across all categories, CADR and noise tell the real story. Some premium models look sleek but move little air, while smaller specialist brands often deliver far higher performance for their price. The purifiers that consistently stand out combine: High CADR – lots of clean air, fast Low noise – quiet enough for daily use Reliable filter support – parts readily available in NZ How We Source and Verify the Data We’ve made every effort to ensure the numbers here are accurate and up to date, but air purifier data can be patchy. Some brands don’t publish CADR or noise levels at all (we’re looking at you Dyson and Shark), or publish only partial figures. Here’s the approach we use, for all purifiers we find available in New Zealand: Manufacturer or retailer specs - when CADR and noise levels are published clearly. EnergyStar database - where CADR is independently verified. Independent tester reviews (e.g. Housefresh, Rtings) when official data isn’t available. If no reliable CADR data can be found, we exclude the model. That’s why this guide shows every purifier in NZ with verifiable performance data. While we’ve double-checked everything, there may still be small differences between sources. Why You Can Trust This guide? The internet is full of “Top 10 Air Purifiers” and “Best Purifiers for Dust” lists - even from well-known outlets. Unfortunately, many are built to generate commission, not to give you the best advice. We want to be upfront: yes, we are selling some of the purifiers in this guide. But unlike affiliate-driven lists, our business depends on you being satisfied years down the track. That means filters being available, performance matching the claims, and you getting genuine value. That's why we aren't just telling you which are the best, we're showing you the data so you can make an informed decision. Why you can’t trust every “Best Of” list To show what we mean: in 2024, the NZ Herald published their “Best Air Purifiers in New Zealand” picks. The problems? Many. It was clear this was written by someone (or AI) with no knowledge of air purifiers. They included models with poor clean air performance, no filters available and unsupported models drop shipped from overseas. Their reason for publishing isn’t to inform you, it’s to earn commission on the products they list. We broke this down in detail here: It's a good reminder that while these lists look authoritative, they don't hold up when you check the numbers. Our aim is different: to compare all models where data exists, show how they stack up, and make it transparent why certain units come out ahead. Features That Don't Add Real Value When shopping around you’ll see lots of air purifiers with added bells and whistles. Some of these aren’t just unnecessary, they can be unhelpful or even harmful: Ionisers / Negative ion generators - can create ozone and just push particles onto surfaces instead of removing them. These are used to improve CADR figures, without filtering out particulates. UV lights - sound impressive, but don’t get enough contact time to work in fast-moving air. HEPA filters already capture these particles. Auto sensors - often cheap, inaccurate and misleading. We recommend a separate, accurate monitor if you want to track your indoor air properly. 👉 For a full breakdown, see our article: What features matter when choosing an air purifier. Final Thoughts This guide compares nearly every purifier currently sold in New Zealand, from compact bedroom models to large commercial systems. Whatever your space, the same principles apply: Focus on CADR and noise, not gimmicks Make sure filters are available locally Choose a model that matches your room size and how you’ll use it 👉 Still not sure which model fits your space? Take our 60-second quiz or browse our full range to find the best value purifiers available in New Zealand today.

Waking up to a stuffy nose, feeling congested, or experiencing exacerbated asthma symptoms can be early signs that the air quality in your bedroom needs improvement. Air purifiers are a proven way to enhance the air we breathe as we snooze. However, while on the search for cleaner air, the last thing anyone wants is a noisy machine buzzing through the night. This piece dives into the essential factors that contribute to making an air purifier both effective in purifying the air and quiet enough to ensure a peaceful night's sleep. Top considerations for your bedroom air purifier: Noise Concerns: A loud air purifier can be a deal-breaker for restful sleep. It's important to find a balance between effective air purification (CADR values) and low noise levels, especially on lower speed settings. Transparency in Performance Metrics: Many manufacturers may not provide clear CADR values at quieter settings or may overestimate the recommended room sizes. Transparency in noise level and CADR metrics is key to make an informed choice. What Does 'Quiet' Really Mean? For undisturbed sleep, experts recommend air purifiers with noise levels below 30dB. Some models, like The Sqair (23dB), SA600 (24dB), and Blast (29dB), fall within this quiet spectrum. Don’t Let the Lights Disturb You: The display lights on air purifiers can be disturbing in a dark room. Opt for simple models with no lights or displays which can switch off to maintain a dark, sleep-conducive environment. The Balancing Act: Noise Levels and Air Purification Efficiency The Noise Factor The tranquility of your bedroom is paramount. While some air purifiers may sound like mini-tornadoes on their max settings, finding a quieter option that doesn't compromise on air purification is key. CADR Values at Quieter Settings Lower settings often equate to quieter operation but may also mean decreased CADR (Clean Air Delivery Rate). It's a tad challenging since many manufacturers often skirt around providing CADR values at these quieter settings. Manufacturers can also be a bit too optimistic with their recommended room sizes. In reality, on lower speed settings, a few of these units might just about manage the air in your wardrobe! Transparency in Performance Metrics We believe in transparency and provide the noise level and CADR of all our products to help you make an informed choice: Model Speed CADR Space cleaned in 20mins Noise The Sqair High 315m³ 42m² 52dB Medium 180m³ 24m² 43dB Low 65m³ 9m² 23dB SA600 High 500m³ 67m² 53dB Medium 260m³ 35m² 39dB Low 135m³ 18m² 24dB Blast Mini High 740m³ 99m² 49dB Medium 450m³ 60m² 43dB Low 340m³ 45m² 36dB Blast High 950m³ 127m² 43dB Medium 680m³ 91m² 37dB Low 450m³ 60m² 29dB  So, How Quiet is 'Quiet'? For peaceful sleep, experts generally recommend noise levels below 30dB. To give you a helping hand: Model Noise level (low) The Sqair 23dB SA600 24dB Blast 29dB However, if you’re a fan of white noise (pun intended) and find it soothing, then you can afford to crank your air purifier up a notch without compromising on sleep quality. Lights Out for Better Sleep One often overlooked aspect of air purifiers in bedrooms is their displays. While many air purifiers come with display lights that can disrupt your sleep, our models are designed with simplicity and effectiveness in mind, devoid of any light-up displays. This ensures nothing comes between you and a peaceful night's sleep, maintaining a dark, serene environment perfect for rest. Wrapping it Up Selecting the right air purifier for your bedroom might take a bit of research, but the rewards — in the form of undisturbed, rejuvenating sleep — are well worth the effort. Ensure you consider noise levels, CADR values at those levels, and the option to have a light-free night. Here’s to breathing easy and sleeping even easier! For sleep friendly options, make sure to check out our range!