Steam cleaning may help slightly but it is not a long term solution. Bare floors can be swiped with a damp mop daily to pick up any dust or pollen. It is especially important to remove the carpeting from the bedroom where the allergic person sleeps. The bedroom should be a sanctuary for clean breathing complete with an air conditioner. If you can t remove the carpeting from the entire house, at least have it taken out of the bedroom.
Bedding is another hiding place for dust mites and pet dander.
Synthetic pillows and mattresses have been found to trap more dust mites and pet dander than feather pillows because of the tighter weave of fabric used on feather pillows. All pillows and mattresses can be covered with allergy proof covers, usually tightly woven material or plastic which encases the entire mattress and zips onto pillows. It is worthwhile to spend the extra money for tightly woven fabric as it can be uncomfortable to sleep on rustling plastic. It is best to start out with brand new pillows and cover them with the allergy proof materials as your old pillows are probably more dust mite than pillow stuffing if they are more than a few years old. The biggest help to any allergy sufferer is the removal of any pet from the home.