Keep a warm humidifier in the room going, not one of the ultrasonic types. Make sure it has a filter on it.
The reason asthma tends to get worse in the winter has to do with a few things -- one is with our migration to indoor air. Another has to do with how dry the air is and how cold it is.
Get obsessive about vacuuming your carpets and cleaning your sheets. Use high quality sheets (80 thread count) made of cotton that can withstand hot water washing on a weekly or bi-weekly basis. Cover your mattress with dust-mite proof covers and don't forget to vacuum THAT too. Clean your curtains, dust often, keep knicknacks to a minimum. If you take long-acting bronchodilators (advair, oxeze, symbicort, foradil, serevent, atrovent) take them right before you go to bed. Look into possibly increasing your dose. Look into the possibility of investing in a dust-remover. Keep your window closed and keep your bedroom door cracked. Change your furnace filter more often, and use higher-quality filters. Look into investing in a static-charge filter. Buy XXL size pantyhose and cut them out to cover your heat registers -- you'll be amazed at the kind of crap they'll filter out.
But most important is the heated humidifier with filter.
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