I think, the single air purifier does not clean the air of your house because the house has separate rooms so the air purifier can’t control the airflow in all the rooms of the house. There are various types of air purifiers are available in the market that guarantee to cover the entire house through the air purification systems but the efficiency of the air purifier is not guaranteed because such types of the air purification system can work efficiently to clean the air of the house.
It is essential to maintain the performance of the air in the various rooms. You require measuring the indoor air quality on a room-by-room basis not the entire house. It is essential to maintain the quality of the rooms under the pre-defined condition. You must have to install the air purifier based on the size of the rooms.