Buying an air purifier in 2026 offers a variety of options, from budget models to advanced technology that blocks PM 2.5 dust. The key is to choose a unit that "covers your room area" to ensure prompt air purification.
Here is a summary of updated buying guidelines for 2026:
You should select a device with a CADR (Clean Air Delivery Rate) or coverage area about 10-20% larger than your actual room size to prevent overworking the unit and reduce noise.
Room Size (sq.m.) | Recommended Unit Size (Coverage) | Usage Example |
15 - 25 sq.m. | 20 - 30 sq.m. | Small bedroom, dormitory, studio condo |
30 - 50 sq.m. | 45 - 60 sq.m. | Large bedroom, medium-sized living room |
60 sq.m. and above | 80 - 100+ sq.m. | Single-storey house lower floor, office, open space |
Focus on value with standard PM 2.5 filtration
Xiaomi Smart Air Purifier 4 Compact: Small, stylish design suitable for desk or small bedroom (approx. 2,7xx THB)
Sharp FP-J30TA: Popular durable model with plasma cluster technology to kill germs (approx. 2,9xx THB)
Philips AC0650/10 (Series 600i): New 2026 model, compact but fast purification, app connectivity (approx. 3,1xx THB)
Accurate sensors with improved odor and allergen filtration
Xiaomi Smart Air Purifier 4 Pro: Suitable for 35-60 sq.m. living rooms, fine filtration and quiet operation (approx. 8,7xx THB)
Samsung AX32: Modern design, precise control via SmartThings app (approx. 7,9xx THB)
Levoit Core 400S: Popular US model with triple-layer filtration, ideal for allergy sufferers (approx. 5,9xx THB)
Advanced technology filters viruses, formaldehyde, with luxury design
Dyson Purifier Cool PC2 (TP12): Both fan and purifier, filters NO2 gases and dust at 99.95% (approx. 29,9xx THB)
Dyson Big+Quiet BP03: For large spaces up to 100 sq.m., operates silently even at high power (approx. 37,9xx THB)
IQAir Atem X: Medical-grade highest standard for those demanding the purest air (approx. 67,xxx THB)