Delhi NCR's air quality drops sharply every winter, and for many families an air purifier is no longer a luxury — it is a daily need for bedrooms, children's rooms and homes with elderly family members. But buying one without checking a few basics can leave you with a machine that is too small for your room or too costly to maintain. This guide explains what actually matters before you shortlist a model.

Start with room size. Every air purifier has a coverage area, usually mentioned in square feet. Choose a model rated slightly above your room size so it can clean the air effectively without running at full speed all the time. Next, check the CADR (Clean Air Delivery Rate) — a higher CADR means faster cleaning, which matters most during high-pollution days.

Look at the filter system. A true HEPA filter is the heart of the purifier because it traps fine dust, pollen and PM2.5 particles. A pre-filter catches larger dust and extends the life of the HEPA filter, while an activated carbon filter helps reduce smoke and cooking odours. Before buying, also check how often the filters need replacement and what they cost — running cost matters as much as the purchase price.

Noise level is important for bedrooms, especially at night. Most good purifiers have a sleep mode that runs quietly while keeping the air clean. Extra features like a real-time AQI display, auto mode, child lock and app control are useful, but they should come after room size, CADR and filter quality — not before them.

Browse the air purifier collection at Aarav Electronics and shortlist models around your room size and budget. Compare the product details, then confirm availability and the complete purchase cost. Aarav Electronics, based at Sarojini Nagar Main Market in New Delhi, offers genuine products with brand warranty and fast delivery across Delhi NCR.