So here is the ugly truth, at the end of last summer, my husband was complaining about cat odor and a musty smell when he graces our residence in Newton with his presence one day a week (the rest of the time he spends at our summer home). He pontificated that the odor was coming from our lower level and that I must need a dehumidifier. Now usually he would be right, and I advise people to use a dehumidifier as the first line of attack when getting rid of musty smells. However in this case the relative humidity was 42% which I measured with my hygrometer so I knew that he was wrong. I had to admit that he was right about the smell. I had got behind in replacing filters for my beloved IQair HealthPro Plus which is seven years old and going strong and I needed a quick solution. So like any company president, I went into the samples room and rifled an Allerair 5000 Vocarb air purifier and took it home. Here is the miracle…24 hours later my husband was exclaiming that he did not know what I had done, but the odor was completely GONE! I told him smugly that I had used an air purifier with a ton of carbon in it. So if you have that kind of problem, the AllerAir 5000 could be your answer. After a few days I was able to lower the fan speed so now I can hardly hear it. Starting at $499.98