my nan suffers from COPD which basiclly asma but the one that you die from! "great" we had the same problem with her so we left the window open all day 2 hours before she went to bed spray mig killer then 1 hour later shut the windon we found in the winter this works great for the summer how ever it just gets to hot so we bought her an air cooler! problem you cant keep them on over night or your family member will get a chest infection "bad news"! but we put it on all day and turned it off just before she goes to bed this way she stays cool and the air is fresh and good for her. anyways try these and see how it goes.