Buying an air purifier? Here are 3 things to look for
Match the air purifier's capacity to your room size for effective cleaning.
Choose a HEPA filter and consider a carbon layer for better air quality.
Check filter replacement costs and long-term maintenance before buying.
Air purifiers are everywhere now, and it is easy to get lost in specs, filters, and fancy names. But you do not need to be an expert to pick the right one. Think of it like buying a pair of shoes. It has to fit your space, do its job well, and not cost you a fortune to keep using. Before you look at a brand or design, focus on three simple things: whether the air purifier you are buying matches your room size, what kind of filter it uses, and how much it will cost you to maintain over time. If you get these things right, then the rest will fall into place.
SurveyTip 1: Size of the room
Every air purifier has his own capacity and is built for different room sizes. If you place a machine that is built for a small bedroom in a large living room, then it will struggle no matter how good the brand is. If you want to avoid that, then the easiest option is to check the CADR rating of the device. The rating allows you to understand how much air the machine can clean in an hour; you can match it to your room’s square footage.
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Tip 2: Type of filter

Another thing you should consider before purchasing an air purifier is the filter installed in the air purifier. The filter is the heart of the purifier, and different filters are built to serve different needs. For a normal household a HEPA filter is standard, as it can trap fine dust, pollen, and even smoke particles. Some purifiers also add a carbon layer, which helps with smells from cooking or pets.
While the abovementioned were the things you should look for in an air purifier, if you see a device claiming ionic or electrostatic cleaning without a proper HEPA filter, then you should avoid buying such devices. These devices reportedly underperform when compared to what has been marketed.
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Tip 3: Maintenance and price
Lastly, when you’re planning to purchase a new air purifier, check the maintenance cost of the device, as the filters of the air purifiers need to be replaced every few months, and this cost adds up over the years. While some replacement filters cost as little as Rs 1,500, others can go up to Rs 5,000.
The price of an air purifier depends on the features offered with the device, and you can buy a basic model for around Rs 5,000, while a more advanced model can cost Rs 20,000 or even more.
Bhaskar is a Senior Copy Editor at Digit India who keeps a close watch on everything shaping the world of technology from smartphones and home appliances to AI, government tech initiatives, digital safety, and the latest industry developments. Whether it's breaking news, in-depth features, hands-on reviews, practical how-to guides, or exclusive scoops, he translates complex tech into stories that are easy to understand and worth reading. His work has been featured in iGeeksBlog, GuidingTech, and other leading publications. Before joining Digit India, he served as an assistant editor at TechBloat. A B.Tech graduate and full-time tech journalist, he is driven by just one goal, which is to help readers stay informed, stay secure, and stay ahead in an ever-changing digital world. View Full Profile