I am a true beliver in Honeywell products. Having a husband that was an Control's engineer I know how good of a product Honeywell is..Had to purchase because of people in my condo were complaining about smoke. I have a good size 2 bedroom condo. I placed in in my living room which is also very large. I must say between my alergies with my cats and eliminating the smoke this is well spent purchase I am very pleased with another great product from Honeywell