113 °F (45 °C) is the minimum lethal temperature — but that's a temperature at the insect's own body, not a thermostat reading. A room can read 135 °F while a bug tucked inside a wall void sits at 105 °F and survives. Every figure that matters is the temperature reached where the insect actually is.
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How hot, and for how long?
At 113 °F, an adult reaches 99% mortality in about 95 minutes; an egg at the same temperature needs roughly seven hours, because eggs are consistently the harder target. That gap is why professionals run whole-room treatments considerably hotter than the bare minimum — commonly cited figures range from EPA's 120 °F for 90 minutes to UC IPM's 140 °F for two hours or 130 °F for three hours. Cornell states that above 125 °F kills bed bugs and their eggs instantly, and describes thermal remediation as heating the home and contents above 135 °F.
- 113 °FMinimum lethal temperature, at the insect
- 94.8 minAdults, 99% mortality at 113 °F
- 428.5 minEggs, 99% mortality at 113 °F — about 7 hours
- 120–140 °FCommonly cited range for professional whole-room treatment
Why doesn't a hot room always work?
Because the heat has to reach the insect, not just the air. Documented failure modes include cold spots inside wall voids and deep cracks, dense contents that shield insects from the heat, and bugs escaping to cooler areas during treatment. One cited real-world example: black-plastic solar wrapping of a mattress reached 85 °C on the upper surface while the lower surface stayed below lethal temperature.
Can bed bugs become resistant to heat?
Evidence suggests no, or at least not easily — the opposite of the pyrethroid picture. Laboratory research selecting for heat resistance across generations found survivorship rose briefly, then stopped improving, with no significant difference in tolerance between strains. The researchers' own conclusion: "the ability of bed bugs to develop heat resistance appears to be limited."
Sources
5 cited- Lethal temperature and exposure-time figures: Kells & Goblirsch 2011, Insects 2(3):412–422, doi:10.3390/insects2030412 (checked 2026-08-18).
- EPA and UC IPM whole-room treatment figures: US EPA, Controlling Bed Bugs Using Integrated Pest Management; UC IPM Pest Notes Publication 7454, May 2013 (checked 2026-08-18).
- Cornell instant-kill and thermal remediation figures: Cornell / NYS IPM, Managing Bed Bugs (checked 2026-08-18).
- Failure modes and the solar-wrap example: Ashbrook, Scharf, Bennett & Gondhalekar 2019, PLoS One 14(2):e0211677; Doggett et al. 2006, cited in Ohio State University, Bed Bug Control: Heat and Cold (checked 2026-08-18).
- Heat resistance research: Ashbrook et al. 2019, PLoS One 14(2):e0211677 (checked 2026-08-18).