Okay, so we decided to have the air conditioning ducts in our house cleaned because who knows how much dust and possibly mold or who knows what is in the ducts of a house built in 1968 that surely never had this done. It was $300 to clean our 1200 square foot house. Good thing we did because there was a very thick layer of dust numerous inches thick and 'stuff' and a little mold in the ducts. I could tell the air was cleaner when it was done. But then I felt that something just wasn't right because I was coughing and felt like something was in my throat and just felt like something was wrong. I asked if they used any chemicals to clean the ducts. No, just suction. So I looked under my bed and saw that the dust had accumulated under there again. I also seemed to have gotten bitten by something on my arm, seems like a spider and brown recluse spiders around her are very poisonous and scary. My husband went to do a thorough vacuuming under the bed and he found layers of dust and tons of eggs and larvae of who knows what creature! How absolutely horrifying!!! Dust mites are bad enough. I store stuff under my bed such as my wedding dress, handbags. etc. Not anymore. It turns out the 'bite' on my arm is probably poison ivy that got into a mosquito bite but all I can say is, if you can, please vacuum under your bed or get someone to do it! Aaaghh! Ugh! Bleh! Cough cough!