I sneezed every morning for two years. Not a little. Full, violent, three-in-a-row sneezes that left me exhausted before breakfast. I bought an air purifier for $200. It helped. But it was loud on high and useless on low. I eventually gave it to my sister and focused on source control instead.

Source control means stopping allergens from getting into your air rather than trying to filter them out after they are already floating around. Here is what made the biggest difference for me.

Your Bedroom Is the Battleground

You spend a third of your life in bed. If your bedroom is an allergen factory, no amount of daytime cleaning matters. The two changes that helped me most:

Wash bedding in hot water weekly. Cold or warm water does not kill dust mites. The water needs to be at least 130°F. My washing machine has a “sanitize” cycle — if yours does not, use the hottest setting available. Dry on high heat too.

Dust mite-proof covers on pillows and mattress. These are zippered fabric covers that seal allergens inside — the mites and their waste cannot escape into the air you breathe. They cost about $15-25 each and last years.

The Floor Is Not Storage

Carpet holds everything: dust, pollen, pet dander, mold spores. If you have the option — and I know not everyone does — hard floors with washable rugs are much easier to keep allergen-free.

If you cannot change your flooring, vacuum at least twice a week with a HEPA-filter vacuum. Not once a week. Twice. The vacuum itself must have a sealed HEPA system, or you are just pulling allergens out of the carpet and blowing them out the exhaust.

Humidity Control Is Allergen Control

Dust mites thrive above 50% humidity. Mold thrives above 60%. A $10 hygrometer — a little humidity gauge — will tell you exactly where your home stands. If you are consistently above 50%, a dehumidifier helps more than an air purifier.

I keep my bedroom at around 40-45% humidity in summer. Dust mites cannot reproduce at that level. They just die off naturally.

Shoes Off at the Door

Pollen sticks to shoes. You walk through grass, across parking lots, through parks — your shoes are pollen magnets. Taking them off at the door stops all that from getting ground into your carpet. I put a simple shoe rack by the front door and the morning sneezing dropped noticeably within a week.