The IQAir HealthPro air purifier is expensive, but according to reviews, it is the best option for people with severe allergies. This air purifier is designed for rooms up to 900-square feet and is the brand chosen by the Hong Kong Hospital Authority as the only room air cleaner powerful enough to be used during the SARS outbreak. The IQAir has a filter change alert and a five-year warranty. This product got the highest rating in its category by both the Allergy Buyers Club and Consumer Search.
Retail price – $649