10 Best Air Purifier

The Philips Air Purifier 600 Series is a solid choice for cleansing indoor air in medium-sized rooms, effectively covering up to around 39 square metres. Its Clean Air Delivery Rate (CADR) of 170 m³/h means it can quickly reduce airborne particles such as dust, pollen, and even tiny viruses, thanks to its advanced NanoProtect HEPA filter that claims to trap 99.97% of pollutants down to 0.003 microns. This makes it especially suitable for allergy sufferers or anyone wanting cleaner air in their home.

One of the purifier’s standout features is its ultra-quiet operation; at just 19 decibels in sleep mode, it’s quieter than a whisper, making it ideal for bedrooms or quiet living spaces. It also shines in energy efficiency, consuming only up to 12 watts even at maximum performance, which is low compared to many similar devices, helping keep electricity bills down. The unit’s compact and sleek design allows it to fit neatly into most rooms without taking up much space or clashing with decor. The Philips Air+ app adds convenience by letting you control the purifier remotely, adjust settings, and monitor filter life, which is handy for keeping the device maintained properly.

It is worth noting that while the purifier covers close to 39 m², the official description mentions suitability for up to 44 m², so it may not be the best pick for very large rooms. The plastic build keeps it lightweight but might feel less premium compared to pricier models. This air purifier provides efficient, quiet, and energy-friendly performance with smart features, making it a great fit for most UK homes needing reliable air cleaning in medium-sized rooms.

The Levoit Core 400S air purifier is designed for large rooms up to about 83 square meters, making it a strong choice if you want clean air in bigger spaces like living rooms or bedrooms. It offers a high Clean Air Delivery Rate (CADR) of 400 m³/h, which means it can quickly filter the air, cycling through your room's air twice every hour. Its 3-stage HEPA filter is very effective at trapping tiny particles down to 0.3 microns, including dust, pollen, pet dander, and smoke, which is helpful for allergy sufferers. One standout feature is the smart PM2.5 sensor that monitors air quality in real time and adjusts the fan speed automatically—this “set it and forget it” mode helps maintain fresh air without manual changes.

It’s also quiet during operation, producing only 24 dB on the lowest setting, so it won't disturb your sleep or daily activities. The energy consumption is moderate at 38 watts, balancing performance and power use. Plus, you can control it conveniently via a smartphone app and even connect it with Alexa for voice commands.

On the downside, while it covers large rooms well, the device is relatively tall and weighs 5 kg, so it may require a dedicated spot and some effort to move around. Also, filter replacement is recommended yearly, which adds to maintenance costs over time. Considering these factors, the Levoit Core 400S is a reliable, smart air purifier with strong filtration and quiet operation for a large area, especially suited for allergy relief and managing indoor air quality effortlessly.

The LEVOIT Smart Air Purifier is designed to handle very large spaces, covering up to 294 square meters (about 3175 sq ft), making it a strong choice for big living rooms, open kitchens, or homes with high ceilings. Its Clean Air Delivery Rate (CADR) of 697 m³/h enables it to quickly and effectively clean the air, refreshing large volumes frequently. The three-stage filter system—pre-filter, HEPA filter, and activated carbon filter—works efficiently to remove common allergens such as dust, pollen, pet dander, smoke, and odors, supporting people with allergies or those sensitive to air quality.

It operates quietly, especially in sleep mode where noise levels can drop to 26 dB, ensuring it won’t disturb you while sleeping or working. While the energy consumption is consistent with purifiers designed for large areas, it may use more electricity than smaller models, which is typical given its capacity. A valuable feature is the real-time air quality monitor with a color display and an automatic mode that adjusts fan speed based on pollution levels, helping to maintain clean air efficiently without constant manual control.

Smart home integration through the VeSync app and compatibility with Alexa and Google Assistant add convenience by enabling remote control, scheduling, and filter life monitoring. Its user-friendly design includes handles for easy moving and safety features such as a child lock and a dimming display for nighttime use. Although its large size may be cumbersome for smaller rooms, and it does not include some advanced features like UV sterilization or ionization, it remains a strong option for robust, reliable air cleaning in large home environments, particularly where allergy relief and smart controls are important.