I use this product mainly for pet dander. I bought two units for approximately a 2400 square foot home. I recently added a puppy to my home and due to a family member with allergies we decided that a air purification system might be a good call. The unit does a great job at cleaning and taking out dog orders from the home, I live the option of turning the unit on maximum speed to clean the air when I feel like my allergies are acting up. The sensor is great in detecting when the air need cleaning and I like the sleep function at night. I would recommend this unit.