Temperature and time work together
A lab study copied the slow heating of a real room and tested adults and eggs. It found that 99% of adults died at 48.3 °C, but eggs needed 54.8 °C. At a lower 45 °C, adults needed about 95 minutes, while eggs needed about seven hours.
Other sources set the bar a little differently. A Virginia Tech guide gives 48 °C for adults and 50 °C for eggs, and a University of California note advises at least 60 °C for two hours. These figures differ because studies use different heating rates and hold times. Therefore, treat any single number as a guide, not a guarantee.
Why the room air is not the target
Whole-room treatments often push the air to between 55 and 65 °C. However, bed bugs hide in cracks, mattress seams and furniture joints. The temperature there depends on how much insulation and thermal mass surrounds them.
Because of this, the Virginia Tech guide says ambient temperature is not the test. Each hiding place must reach lethal heat by itself. Its authors note that drawers, floor edges and spots under bags heat slowly, and some may never get there in a standard visit.
Sensors find the cold spots
Sensors matter because they show which places reached lethal conditions and which need more time. The lab researchers note that sensors let a technician see where extra exposure is needed. The Virginia Tech guide describes checks in hard-to-heat spots about every 20 minutes, with fans and heaters moved as needed.
Ask a provider how many sensors they use and where they put them. Ask how they correct a cold spot, and whether you will see the readings. A reply that mentions only the room air should worry you.
Preparing the room
Preparation protects both your belongings and the result. The Virginia Tech guide lists items to remove, such as aerosol cans, lighters, candles, lipstick, medicines, plants and pets. It also advises unplugging electronics and wrapping televisions. Our preparation guide covers each step in order.
Clutter needs thought. The same guide says clutter does not necessarily stop a good heat system from working. Even so, boxes and bags stacked against walls stop those surfaces from heating. Opening drawers, wardrobes and cupboard doors lets heat reach their cracks.
Your provider should give you an item-specific list before the visit. Therefore, follow that list rather than a generic one. Some providers now ask for minimal preparation and clear only what blocks airflow. The US EPA also warns against moving items from an infested area to a clean one.
How long a job takes
The Virginia Tech guide describes aiming for an air temperature near 57 °C and holding it for four to five hours. However, larger homes, several floors and full storage areas can run longer. The time depends on the volume of the space, not just its floor area.
Our guide to how long a heat treatment takes goes through the stages. It also lists what to ask your provider about timing.
What heat cannot do
Heat leaves no residue, so it protects nothing afterwards. Bed bugs carried in on luggage or secondhand furniture can start a new infestation. Missed hiding places can also restart one.
Therefore, plan a follow-up. The Virginia Tech authors advise an inspection within a week to check that hiding places are empty and that nobody has new bites. They also describe a desiccant dust in hard-to-heat spots as a backup, which our desiccant dust guide explains. Our after-treatment guide lists what to monitor.
You can use heat at home on a small scale. The NHS advises washing affected bedding and clothing at 60 °C and tumble drying on a hot setting for at least 30 minutes. See our guide to washing and drying for bed bugs for what that does and does not cover.
How heat fits with other methods
Heat is one option among several. Steam treats surfaces by hand, while insecticides leave a residue. Our comparison of treatments sets all three side by side.
The NHS says bed bugs are very hard to remove yourself and suggests contacting your council or a pest control service. For that reason, home heat tricks are unlikely to replace a professional job.
Sources and further checks
Open each source before you act on anything that can change, such as council services, prices, tenancy rules and product labels. Labels and official guidance are revised from time to time, so the source always wins over our summary.