Adult bed bugs die when exposed to temperatures of about 119°F (48.3°C), but eggs are tougher and require around 131°F (54.8°C) for guaranteed kill. Temperature alone isn’t the whole picture, though. How long the heat is sustained matters just as much, and the numbers shift depending on whether you’re running a dryer, using steam, or hiring a professional whole-room treatment.
Lethal Temperatures for Adults vs. Eggs
The thermal death point for 99% of adult bed bugs is 119°F (48.3°C). At a slightly lower temperature of 113°F (45°C), adults can survive for a while but will die after about 95 minutes of sustained exposure. The higher you go above that threshold, the faster they die.
Eggs are significantly more heat-resistant. Their thermal death point is 131°F (54.8°C), more than 10 degrees higher than adults. At 118°F (48°C), eggs need at least 72 minutes of continuous exposure to reach full mortality. Drop the temperature to 113°F (45°C) and eggs can survive over 7 hours, making lower heat settings unreliable for wiping out an infestation completely.
This gap between adults and eggs is the single most important detail for anyone trying to use heat at home. If you’re only reaching temperatures that kill adults, you may leave eggs behind and face a new generation of bugs within a couple of weeks.
Using Your Dryer to Kill Bed Bugs
A household dryer on the “high” setting kills all life stages of bed bugs, including eggs, in 30 minutes. This makes it one of the simplest and most accessible tools for treating clothing, bedding, stuffed animals, and other fabric items.
The key is to keep the load loose. An overstuffed dryer won’t heat evenly, and items in the center may never reach lethal temperatures. Toss in small to medium loads and let the full 30 minutes run. If items are already dry, you don’t need to wash them first. Just run the dryer cycle. For items that can’t handle high heat (like delicates), the dryer may not get hot enough on a lower setting to reliably kill eggs.
Whole-Room Heat Treatments
Professional heat treatments work by raising the temperature of an entire room, including the air inside wall cavities, mattress seams, and furniture crevices, to lethal levels. The target is typically to get every hiding spot to at least 118°F (48°C) and hold it there for over 70 minutes, or to push all areas above 122°F (50°C) for a shorter period. Research on thermal kill times suggests that once every surface in a room reaches 122°F or above, the treatment can stop, because that temperature kills both adults and eggs relatively quickly.
The challenge is that air temperature and surface temperature are not the same thing. The center of a mattress, the inside of a couch cushion, or the gap behind a baseboard heats much more slowly than the surrounding air. Professionals use temperature sensors placed in these harder-to-reach spots to confirm that lethal heat has actually penetrated everywhere. Treatments typically take several hours, not because the bugs need that long to die, but because it takes time for heat to soak into dense materials.
What to Remove Before Treatment
Whole-room treatments push ambient temperatures high enough to damage certain belongings. Before a treatment, you’ll typically need to remove houseplants, pets, candles, aerosol cans, cigarette lighters, medications, and any non-refrigerated food or produce. Electronics should be unplugged, and televisions are often wrapped in blankets or taken out entirely. Stringed instruments, family heirlooms, photographs, and lipstick (which melts easily) should also come out. Your pest control company will provide a specific prep list, but the general rule is: if it could melt, warp, explode, or degrade in a very hot car, remove it.
Why Temperature and Time Work Together
Heat kills bed bugs by denaturing proteins and disrupting cellular function. This process isn’t instant at borderline temperatures. At 113°F, adults take about 95 minutes to die, and eggs survive for hours. Raise the heat to 118°F and eggs still need over an hour. But at 131°F, eggs die in minutes.
This relationship means there’s no single magic number. A temperature of 120°F will eventually kill everything, but only if maintained long enough. A temperature of 140°F will do it almost immediately. For practical purposes, the most reliable benchmark for DIY efforts is to aim for at least 120°F sustained for 90 minutes or more, which covers both adults and eggs with a safety margin. For dryer use, 30 minutes on high is sufficient because the drum temperature on most dryers exceeds 130°F.
Common Heat Methods and Their Limits
- Clothes dryer: Effective for loose fabric items. High setting for 30 minutes kills all stages. Not useful for furniture, electronics, or large items.
- Steam cleaners: Can kill bed bugs on contact if the surface temperature reaches at least 160°F. Effective for mattress seams, baseboards, and upholstery. The steam must be applied slowly and methodically, because moving too fast leaves cool spots. Steam also adds moisture, which can promote mold if overused on mattresses.
- Portable bed bug heaters: Enclosed heating units designed for luggage, shoes, or small items. Most reach 120°F or higher internally. Follow the manufacturer’s recommended duration, which is usually several hours.
- Professional whole-room treatment: The only reliable way to heat-treat an entire room or home. Typically costs between $1,000 and $3,000 depending on the size of the space. Usually completed in one visit.
What Doesn’t Get Hot Enough
Leaving items in a hot car on a summer day is sometimes suggested, but car interiors rarely sustain uniform temperatures above 120°F in all areas, especially in shaded spots or inside dense objects. The trunk, floor areas, and anything insulated by fabric may stay well below lethal thresholds. If you try this approach, use a thermometer to verify that the coldest spot inside the vehicle stays above 120°F for at least 90 minutes.
Space heaters and hair dryers also fall short. They heat the air directly around them but can’t raise the temperature of an entire room uniformly. Bed bugs sense rising heat and will move away from the source into cooler crevices, making spot-heating ineffective and potentially scattering the infestation to new areas. There’s also a fire risk from running space heaters at maximum output for hours in an enclosed room.