Heat is one of the most effective ways to kill bedbugs at every life stage, from adults to eggs. The key numbers: adult bedbugs die at about 118°F (48°C), while eggs require a higher temperature of around 122°F (55°C). But hitting those temperatures isn’t enough on its own. How long the heat is sustained, and whether it reaches every hiding spot, determines whether the treatment actually works.
The Temperatures That Kill Bedbugs
Adult bedbugs and nymphs have a thermal death point of 118°F. Eggs are harder to kill and need temperatures closer to 122°F. No bedbug at any life stage survives exposure above 122°F (50°C), period.
At lower temperatures, time becomes critical. Adults exposed to 113°F need roughly 95 minutes of sustained heat before all of them die. Eggs at that same temperature can survive over seven hours. Raise the temperature to 118°F, and eggs still require about 72 minutes of continuous exposure. This is why professional treatments don’t aim for the bare minimum. They push room temperatures well above the death point and hold them there for hours, building in a safety margin that accounts for cold spots and insulated hiding places.
Using Your Clothes Dryer
The simplest heat tool you already own is your dryer. A loosely filled dryer set on high kills all bedbug life stages, including eggs, in 30 minutes. This works for clothing, bedding, stuffed animals, fabric bags, and other items that can tolerate tumble drying.
A few practical points: don’t pack the dryer full, because items in the center of a tightly packed load may not reach lethal temperatures. Loosely filling it ensures hot air circulates around everything. If items are already dry, you can skip the washer entirely and go straight to the dryer. Washing alone, even in hot water, is not reliable enough to kill eggs. The dryer’s sustained dry heat is what does the job.
Steam Treatment for Furniture and Crevices
A steam cleaner lets you target spots you can’t throw in a dryer: mattress seams, box springs, bed frames, baseboards, and upholstered furniture. Steam kills all life stages on contact, including eggs, when applied correctly.
The critical factor is speed, or rather slowness. You need to move the nozzle at roughly 20 seconds per linear foot, which feels painfully slow. Moving too fast means the surface temperature drops below the lethal threshold before the heat penetrates deep enough. The goal is for the steam to soak into fabric and reach into cracks where bedbugs hide, not just pass over the surface.
Not every steamer works. You need a commercial-grade steamer that produces real steam, not a garment steamer or a handheld unit designed for wrinkles. The steam output needs to be high enough that the surface you’re treating stays well above 120°F even a fraction of an inch below the surface. A thermometer or infrared temperature gun can help you verify you’re hitting the right range.
Professional Whole-Room Heat Treatment
For a full infestation, professional heat treatment is the most thorough single-session option. Technicians bring industrial heaters into your home, raise the ambient air temperature to about 135°F, and hold it there for four to five hours. Fans circulate the hot air so it penetrates into wall voids, furniture, and other hiding spots.
The reason professionals aim for 135°F rather than the minimum lethal temperature is that air temperature and surface temperature aren’t the same thing. The inside of a mattress, the space behind a baseboard, or the core of a pile of clothes will always be cooler than the surrounding air. By pushing the room temperature well above the death point, technicians ensure that even the coldest spots in the room eventually reach lethal levels.
Before treatment, you’ll typically be asked to open all drawers and closet doors, pull furniture away from walls, and remove anything that could be damaged by extreme heat. Items like candles, chocolate, vinyl records, aerosol cans, certain medications, and some electronics can melt, warp, or malfunction at these temperatures. Your technician should give you a specific list.
Why Heat Treatments Sometimes Fail
Heat treatment failures almost always come down to one issue: cold spots. If any area in the room stays below the lethal temperature long enough, bedbugs in that spot survive. Concrete walls, dense furniture, and cluttered areas are common culprits because they absorb heat slowly.
At lower temperatures like 112 to 115°F, bedbugs can survive for hours. So a room that reaches 115°F in one corner instead of 135°F won’t kill the bugs hiding there unless that temperature holds for an extended period. This is the difference between a successful treatment and one that leaves survivors behind to repopulate within weeks.
Clutter is the enemy of heat treatment. Piles of belongings insulate bedbugs from the surrounding air. The more open and accessible a room is, the more evenly heat distributes. If you’re paying for professional treatment, thorough preparation is the single biggest thing you can do to improve the odds of success.
DIY Heat Options and Their Limits
Beyond dryers and steamers, some people use portable bed bug heaters designed for treating luggage, small furniture, or bags of clothing. These are essentially insulated enclosures with a heating element that raise the internal temperature above 120°F. They work well for isolated items but can’t treat a room.
Space heaters are not a substitute for professional equipment. Consumer space heaters can’t raise and maintain room temperatures to 135°F, and attempting to do so creates a serious fire risk. Whole-room treatment requires industrial heaters with high BTU output and professional monitoring with temperature sensors placed throughout the space.
One effective DIY approach for smaller items: black plastic bags left in direct sunlight on a hot day. On a 95°F day, a sealed black bag in full sun can reach internal temperatures above 130°F. But this depends heavily on climate, sun exposure, and bag placement. Use a thermometer inside the bag to confirm temperatures, and leave items for several hours to ensure heat penetrates fully. This method is unreliable in cooler climates or overcast conditions.
Combining Heat With Other Methods
Heat alone can eliminate an infestation if every bug and egg is exposed to lethal temperatures. In practice, most pest control professionals recommend combining heat with other approaches. Residual insecticide applied to baseboards and cracks after a heat treatment catches any bugs that may have escaped to cooler areas like wall voids or adjacent rooms during the treatment.
Encasements on your mattress and box spring serve a different purpose: they don’t kill bedbugs, but they trap any survivors inside where they’ll eventually die, and they eliminate the deep seams and folds where bedbugs prefer to hide. Used alongside heat treatment, they reduce the chances of reinfestation from bugs you couldn’t reach.
For most people dealing with bedbugs, the practical approach is layered. Use your dryer for all washable items. Steam-treat your mattress, bed frame, and nearby furniture. And if the infestation is established in multiple rooms or deep in your walls, bring in a professional for whole-room heat treatment. Each method targets a different part of the problem, and together they cover the gaps that any single approach leaves open.