If you can't afford central air and don't want to rip the wall-to-wall carpeting out of every room in your house, there's still hope. Make just one room a sanctuary.
"Most people spend the largest part of their time at home in the bedroom," Dr. Platts-Mills says. Making just that one room an allergen-free area can do a great deal to alleviate the allergy.
Do it by air-conditioning the room in summer, sealing it from the rest of the house (by keeping the door closed), replacing carpets with throw rugs, encasing linens in allergen-proof cases, and keeping it dust-free.