Bed bugs die when exposed to temperatures above roughly 120°F (49°C) or below 0°F (-18°C), but temperature alone isn’t the whole picture. How long the bugs stay at that temperature matters just as much. A brief blast of heat won’t penetrate deep enough to kill eggs hidden in seams and crevices, while a sustained exposure at the right temperature wipes out every life stage.
Heat Thresholds That Kill Bed Bugs
Adult bed bugs, nymphs, and eggs all die when their internal temperature reaches about 120°F to 130°F (49°C to 54°C) and stays there long enough. At the lower end of that range, the exposure needs to last longer. At 130°F or above, death comes within minutes. Eggs are the hardiest life stage, requiring slightly more heat or time than adults.
The key concept is the “thermal death point,” the combination of temperature and duration where no bed bug survives. Raising the temperature shortens the required time, and lowering it means you need a longer exposure. This is why every heat-based method has its own timing guidelines.
Using a Household Dryer
Your clothes dryer is one of the most effective tools you already own. A loosely filled dryer set on high kills all bed bug life stages, including eggs, in 30 minutes. The “loosely filled” part matters because hot air needs to circulate freely and reach every fold and seam.
For items that can’t tumble, like leather shoes, handbags, books, or small electronics, a dryer with a removable shelf works well. Place items on the shelf and run the dryer on high, but extend the time beyond 30 minutes to make sure heat penetrates fully through denser materials. If you’re dealing with clothing or bedding after discovering an infestation, running everything through a high-heat dryer cycle is the fastest first step you can take.
Washing alone isn’t as reliable. Hot water helps, but many fabrics get washed at temperatures below the thermal death point. The dryer, not the washer, is what actually does the killing.
Steam Cleaning for Mattresses and Furniture
Steam cleaners produce temperatures well above the lethal threshold, making them useful for treating mattresses, couches, chairs, and other surfaces you can’t toss in a dryer. When applied directly, steam kills all life stages of bed bugs, including eggs.
The catch is speed. You need to move the nozzle slowly, about 20 seconds per linear foot, so the heat penetrates deep enough and stays in contact long enough to kill bugs hiding below the surface. Rushing the nozzle across a mattress seam might kill bugs on the very surface but leave eggs a quarter inch deeper completely unharmed. Work methodically along seams, tufts, folds, and edges where bed bugs tend to cluster.
Professional Whole-Room Heat Treatments
Professional heat treatment is the most thorough option. Exterminators bring in industrial heaters and fans to raise the entire room’s ambient temperature to 130°F to 145°F (54°C to 63°C), then hold it there for several hours. The goal is to heat every surface, wall cavity, and piece of furniture past the thermal death point so there’s nowhere for bugs to hide.
This approach works in a single treatment and avoids pesticides entirely, which is a significant advantage since many bed bug populations have developed resistance to common insecticides. The downside is cost, typically ranging from $1,000 to $3,000 or more depending on the size of the space. Some items like candles, certain plastics, and aerosol cans need to be removed beforehand because they can melt or rupture at those temperatures.
Cold Temperatures That Kill Bed Bugs
Freezing works too, but it takes much longer than heat. At 0°F (-18°C), the temperature of a typical household freezer, all stages of bed bugs die after 3 days of continuous exposure. If you’re not sure your freezer actually holds at 0°F (many hover between 0°F and 5°F), extend the freeze to a full 2 weeks to be safe.
At warmer freezing temperatures, the timeline stretches further. A minimum of 23°F (-5°C) must be maintained for at least 5 days to kill bed bugs. Flash-freezing at -15°F (-26°C) kills eggs instantly, but that’s far colder than any home freezer reaches. Pest control professionals sometimes use portable cryogenic equipment to achieve these temperatures on furniture and other large items.
Freezing works best for smaller items you can seal in bags and place in a chest freezer: books, picture frames, shoes, stuffed animals, small electronics. It’s not practical for mattresses or large furniture, and it won’t help with a room-wide infestation.
Why “Close Enough” Doesn’t Work
Bed bugs are surprisingly good at finding cooler pockets within a heated space. In a room being treated at 140°F, the interior of a thick mattress or the gap behind a baseboard might only reach 110°F, which is uncomfortable for bed bugs but not lethal. The same applies to your dryer: an overstuffed load creates insulated pockets where items never reach the target temperature.
This is why sustained, even exposure is the non-negotiable factor. A dryer needs to run for 30 minutes after reaching full heat, not 30 minutes total including warmup. A steam cleaner needs slow, deliberate passes. A freezer needs to hold temperature for days without the door being opened repeatedly. Every time you cut corners on duration or uniformity, you risk leaving surviving eggs that hatch and restart the infestation within a few weeks.
Choosing the Right Method for Each Item
- Clothing, bedding, towels, and fabric items: Dryer on high for 30 minutes. This is the fastest, easiest, and most reliable DIY method.
- Mattresses, couches, and upholstered furniture: Steam cleaning with slow, thorough passes. Follow up with encasements to trap any survivors.
- Books, shoes, electronics, and delicate items: Bag them and place in a freezer at 0°F for at least 3 days, or 2 weeks if your freezer temperature is uncertain.
- Entire rooms or heavy infestations: Professional heat treatment is the most effective single intervention available.
For anything beyond a small, contained infestation, combining methods gives you the best odds. Treat what you can with your dryer and steam cleaner, freeze what you can’t heat, and bring in professionals for the structure itself.