I purchased two of these Ionic Breeze air purifiers and I love them. They are easy to use, easy to clean, they don't need any replacement parts and they work silently. They have three settings on the dial, low, medium and high, but I just turn it all the way up. They also have a blue lit button for a boost, which turns it up higher for a few minutes or if you push it again it turns green which boosts the ions. If there is a odor or problem in the room I turn on the boost to help clear it. They require cleaning every week or two. There is a light that goes on to tell you it is time to clean it. Unfortunately one of my machines has a defective light and does not tell me it needs cleaning but it does start to make a crackling noise if it gets too dirty. To clean you just lift out the center which has three metal bars about two inches wide running parallel the height of the machine. You wipe the dirt off the sides of these with a damp cloth or paper towel and black dirt easily comes off. If you use too much water you must dry these bars or allow to air dry before reinserting them. When you put it back in the machine you also pick up the machine and turn it over a few times back and forth to clean the wire inside. Also when the vents outside get dusty you can take off the front and back vents section and dust them. The air cleaners really work. The air is so much cleaner in the room with them running. I sleep better with it running. I would love to have one in each room. The only time I turn them off is if I have all the windows open to air out the whole house. They help with my children's allergies and helps us all breathe better. I would definitely recommend these for every room of the house.