Have only used the one machine twice in our bedroom in a week,. Sleeping better no morning, cough, and allergies in the morning. The first time I used it, I took all the bedding off sheets, pillowcases, comforter, etc., the second time the bed was made up.. We are delighted with the results. I would recommend this to anyone with bad allergies or breathing problems part. My husband has interstitial lung disease, and the mornings were hell for him, he’s so much better now. Thank you.