by Quick answer: Wash all bedding weekly in hot water (130 °F / 54 °C or higher), vacuum the mattress with a HEPA-filter machine, seal it in a zippered allergen-barrier cover, and keep bedroom humidity below 50%. You can’t wipe out dust mites entirely, but those four steps knock the population down sharply enough that most allergy sufferers notice real relief.
By the MattressNut editorial team · Updated June 2026
What Dust Mites Actually Are (and Why Your Mattress Is Their Favorite Spot)
Dust mites are microscopic arachnids, about 0.3 mm long, invisible to the naked eye. They don’t bite — the sneezing, itchy eyes, and nighttime coughing come from their droppings and shed body fragments, which become airborne and trigger IgE-mediated allergic reactions.
Your mattress is prime real estate for them. A single adult sheds enough dead skin each night to feed thousands of mites, and a warm bedroom at 65–75 °F creates exactly the microclimate they need. The critical factor is moisture: mites can’t drink water; they absorb humidity directly from the air. Drop relative humidity below 50% and they dehydrate and die. That single fact explains why the most effective controls all attack moisture.
How to Get Rid of Dust Mites: Step-by-Step
Step 1: Hot-Wash All Bedding Every Week
Sheets, pillowcases, and duvet covers need to hit 130 °F (54 °C) to kill mites. Cold and warm cycles leave the population intact. If a comforter can’t go in a home washer at that temperature, run it through a dryer on high heat for 30 minutes instead — the heat alone does the work.
Frequency matters as much as temperature. Weekly is the threshold. Every two weeks allows the population to rebuild between washes.
Step 2: Vacuum the Mattress with a HEPA-Filter Machine
Use an upholstery attachment and work in overlapping passes across the entire surface, sides included. A standard vacuum recirculates fine particles; a HEPA filter traps them. Focus extra time on seams and tufts, where skin flakes accumulate. Vacuum monthly at minimum, more often if allergies are severe.
After vacuuming, sprinkle a thin layer of baking soda over the mattress, let it sit for 15–20 minutes to absorb odors and surface moisture, then vacuum again.
Step 3: Seal the Mattress in a Zippered Allergen-Barrier Encasement
A mite-proof encasement is not the same as a standard mattress protector. Look for one rated with a pore size of 6 microns or smaller — tight enough to block mite bodies and their droppings. The encasement goes directly over the mattress, under the sheets. Wash it every month or two in hot water.
Do the same for pillows. Pillows are pressed directly against your face; an unprotected pillow can harbor as many mites as an old mattress.
Step 4: Drive Bedroom Humidity Below 50%
This is the most durable long-term control. A portable dehumidifier or a consistently-run air conditioner can keep relative humidity in the 40–50% range year-round. If you live somewhere humid (Southeast Asia, coastal US, most of the UK), a dehumidifier pays for itself in allergy medication within a season.
Open windows on dry days to ventilate. Strip the bed and let the mattress air out for an hour in sunlight when weather allows — UV light and heat together accelerate mite die-off on exposed surfaces.
Step 5: Reduce the Clutter That Feeds Them
Stuffed animals, decorative cushions, thick rugs, and upholstered headboards all act as secondary mite reservoirs. Fewer soft surfaces in the bedroom means fewer places for mites and skin flakes to accumulate. Washable cotton or synthetic materials are easier to maintain than wool or down.
Dust Mite Allergy: Signs You’re Reacting to Your Mattress
The timing of symptoms is the clearest signal. If you wake with a stuffy or runny nose, sneeze repeatedly in the first 20 minutes after getting up, or notice that eye irritation and congestion improve significantly after spending a few hours away from the bedroom — dust mites are the likely cause.
Other signs: persistent nighttime cough, eczema flares that correlate with bedtime, or asthma that’s harder to control during humid months. A skin-prick or blood test (specific IgE to Dermatophagoides pteronyssinus or D. farinae) confirms the allergy definitively.
Very old mattresses are worth replacing rather than just cleaning. After 8–10 years of use, the foam and fiber layers hold a dense accumulation of skin, mites, and droppings that no surface vacuum can reach. If your mattress is past that point and allergies remain stubborn despite all the steps above, a new mattress — encased from day one — often delivers more relief than any other single intervention. The Saatva Classic includes free white-glove delivery and removal of your old mattress, so the allergen-laden one leaves the house entirely. (See the Saatva Classic and its 365-night trial)
Frequently Asked Questions
Do dust mites actually bite?
No. Dust mites don’t have the mouthparts to pierce skin. The itching, sneezing, and watery eyes that people associate with “mite bites” are allergic reactions to inhaled mite droppings and body fragments, not bites. If you’re waking up with actual bite marks or welts, that points to bed bugs or another pest — a very different problem.
What temperature kills dust mites in laundry?
130 °F (54 °C) sustained for a standard wash cycle kills mites reliably. Below that — including most warm-water cycles — they survive. If your washer’s hot setting doesn’t reach 130 °F, a 30–40 minute tumble in a dryer set to high heat (which typically reaches 135–145 °F) achieves the same result.
Can you vacuum dust mites out of a mattress?
You can remove a significant portion of surface mites, their droppings, and the skin flakes they feed on — but vacuuming alone doesn’t eliminate the population inside the mattress. It works best as one layer of a combined approach: vacuum, then encase to prevent re-infestation, then manage humidity to kill what remains.
Does baking soda kill dust mites?
Not directly. Baking soda doesn’t kill mites on contact. What it does is absorb surface moisture and odors, making the mattress surface a marginally less hospitable environment. It’s useful as a deodorizer between deep cleans, but it’s not a substitute for hot washing, encasements, or humidity control.
How quickly does lowering humidity reduce dust mites?
Mites begin to dehydrate and die within a few days of sustained humidity below 50%, and population levels drop measurably within two to four weeks. The effect is cumulative — the longer you maintain low humidity, the more the population falls. This is why a dehumidifier or air conditioner running consistently outperforms any periodic cleaning effort.
Are dust-mite sprays worth buying?
Most over-the-counter acaricide sprays have limited usefulness on a mattress. They treat the surface, but mites live through multiple layers of fabric and foam. You also sleep directly on what you spray. The research on benzyl benzoate and tannic acid sprays shows modest, short-lived reductions — not enough to justify regular chemical use when encasements, hot washing, and humidity control are proven to work better and cost less over time.
Bottom line: Hot-wash bedding weekly at 130 °F, encase the mattress and pillows in allergen-barrier covers, vacuum monthly with a HEPA machine, and keep bedroom humidity under 50%. Do all four consistently and most allergy sufferers notice real improvement within a few weeks.