Shelly does your son suffer from allergies too? If so, does his allergies set off his asthma? If he does have allergies, you might want to see what sort of pollen (tree or otherwise) is in the area. If he does have allergies - do not leave his window open because spring is notorious for causing a bunch of havoc because of the pollen, mold, mildew etc.
If he doesn't have allergies then the only thing I can think of is taking the carpet out of his room and put in tiles or even pergo flooring. Because even if a carpet is professionally cleaned, carpet will still stir up nasties (dust, carpet fibers) and the cleaning sometimes don't even get into the padding which can hold everything that ever happened in that room.
Moderator for Allergies/Asthma and Co-moderator for UC
~Left sided Uc-'92-Colazal(9 daily),6mp(50-100mgs),Prilosec,Biotin,Forvia,Pro-Bio**Unable to tolerate Asacol, Rowasa or Canasa**~Allergies-Singulair
~Secondary Reynauds Syndrome-'04-Norvasc~Fibromyalgia-'06~Sacroiliitis-epidural injections
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