It might seem overwhelming for someone who’s never purchased an air purifier – there are so many choices and not enough straightforward answers. HEPA filter, CADR rating, ionizer, and coverage areas – it’s all very technical!
But relax. This guide is designed for you, a first-time buyer, who wants to make a rational decision without getting bogged down in the details. By the end, you’ll have a handle on what matters, what to avoid, and how to choose the best air purifier for your home.
Let’s help you breathe a little easier, literally.
Do You Need an Air Purifier?
Air purifiers help clean the air inside your home by removing harmful particles. Although you may not always see these harmful particles in your home, they are typically there, especially in areas with heavy traffic, if you have pets, or if you use candles regularly (or simply open your windows often).
If you or any of the tenants in your home suffer from allergies, asthma, or other breathing issues, having an air purifier will make a real difference. Air purifiers can trap dust, pollen, mould spores, pet dander, and even smoke or harmful gases from cleaning products and paints.
Even if you are perfectly healthy, clean air is associated with better sleep, greater focus, and a decreased chance of committing to more serious breathing problems.
Understanding the Options
- HEPA Filters
A True HEPA filter is certified to remove at least 99.97% of small airborne particles such as pollen, dust, and pet dander. Choose a unit with a True HEPA filter rather than a “HEPA-type” or “HEPA-like” filter. - Activated Carbon Filters
These remove odors and gases, such as smoke and cooking smells. They’re not as effective at capturing dust or pollen, but they are good for chemical or odor concerns. - Ionizers & UV Purifiers
Ionizers emit charged ions to drop particles to the ground. UV purifiers claim to kill germs with light. Some may emit ozone, which can be harmful. They don’t work effectively on their own. - Hybrid Systems
These combine HEPA, carbon, and UV features. They offer increased protection but tend to cost more. Xiaomi purifiers belong to this category.
Features to Look For
- HEPA Filter – A must-have for capturing allergens.
- CADR Rating – Indicates how fast the purifier cleans the air. Higher is better. Look for CADR values for smoke, pollen, and dust.
- Room Size Compatibility – Ensure the unit is rated for your room’s square footage.
- Replacement Cost of Filters – Some purifiers are cheap upfront but costly in filter replacements.
- Noise – Choose units under 50 dB for quiet operation. Look for sleep/night mode options.
- Smart Features – Extras like smartphone control and auto-adjust sensors are nice but not essential.
- Air Quality Indicators – Some units show air quality levels in real-time using coloured lights.
Advice on Room Size and Placement
One of the major mistakes people make when buying a purifier is selecting one that is too small. A small unit won’t perform well in a big living room.
| Room Size (sq ft) | Recommended CADR (Minimum) |
|---|---|
| Up to 150 | 100+ |
| 150 to 300 | 150–200 |
| 300 to 500 | 200–300 |
| Over 500 | 300+ |
Place the unit in the room where you spend the most time. For better airflow, keep it away from walls and furniture.
Maintenance and Running Costs
- Check how often you need to replace the filter – typically every 6–12 months.
- Compare filter costs before purchasing.
- Look for a washable pre-filter to help extend the life of the HEPA filter.
- Choose energy-efficient models (e.g., Energy Star certified) if planning to run 24/7.
Safety Certifications to Look For
- AHAM Verified – Independently tested and verified.
- CARB-Compliant – Important for California residents, ensures low ozone emissions.
- UL or ETL – Basic safety certifications.
What to Expect at Different Price Levels
| Price Level | Expected Characteristics |
|---|---|
| Under $100 | Small room coverage, basic HEPA, and few features |
| $100–$200 | Medium room coverage, HEPA + charcoal filters, low noise |
| $200–$400 | Large room coverage, smart features, higher CADR |
| $400 and up | Premium build, multi-room use, app control, sensors |
You likely don’t need to spend more than $200 for bedrooms or offices.
Ready to Breathe in Clean Air?
Buying an air purifier is an excellent move for a healthier living space. Whether you want to sleep better, reduce sneezing, or enjoy peace of mind, a good purifier will improve your home’s air.
