To use a bed bug heat box, load your items loosely so air can circulate, run the unit until the interior reaches and holds at least 120°F throughout, and keep it there for the full time the manufacturer specifies — often several hours. Heat works because sustained temperatures above about 118°F kill bed bugs and their eggs, with no chance of resistance.
Key Takeaways
- Target a sustained interior temperature of at least 118–120°F reaching the center of every item.
- Don’t overpack — bugs hide in the coldest spot, so air must circulate around everything.
- Use the thermometer/probe to confirm the items (not just the air) hit temperature.
- Hold the heat for the full recommended time — usually a few hours, not minutes.
- Ideal for items you can’t wash: shoes, books, electronics (with care), bags, and decor.
- Chemical-free and kills eggs, which many sprays don’t.
What a bed bug heat box does
A heat box (heat chamber) is an insulated, collapsible container with a heating element that raises everything inside above the temperature bed bugs can survive. Sustained heat above roughly 118°F is lethal to all bed bug life stages, including eggs (University of Minnesota Extension: Bed Bugs). Because the kill is physical, not chemical, there’s no resistance — the reason heat is one of the most dependable tools available to a homeowner. Compare units in our bed bug heat box guide.
Step by step: how to use a heat box
- Set it up on a hard, heat-tolerant surface in a room you can leave undisturbed. Assemble the chamber per the instructions.
- Load items loosely. This is the single most important step. Bed bugs survive in the coldest pocket inside the chamber, so don’t cram it full. Unfold clothing, open bags, separate books, and leave gaps for air to move.
- Place the temperature probe in the densest item, not in open air. You’re trying to confirm the center of a packed shoe or folded jacket reaches temperature, since that’s the last place to heat up.
- Power on and let it climb. It can take a while to bring a full load up to temperature; that ramp-up time doesn’t count toward the kill time.
- Hold at target temperature for the full recommended duration. Once the probe shows the items have reached at least 118–120°F, keep the unit running for the manufacturer’s specified hold time (commonly several hours). Don’t cut it short.
- Power down, let it cool, and unload. Items are decontaminated and ready to return to a clean area.
What to put in a heat box (and what to keep out)
Great for: shoes, boots, folded clothing, backpacks and luggage, books, stuffed toys, small décor, linens — anything that can’t go through a washer/dryer but tolerates moderate heat.
Be careful with: electronics, candles, aerosols, cosmetics, vinyl records, sealed liquids, and anything with a low melting point or pressurized contents. Check the manufacturer’s exclusion list before loading these — some electronics are fine at bed bug heat-box temperatures, but pressurized or wax-based items are not.
How heat fits the bigger plan
A heat box decontaminates your belongings, but it doesn’t treat the room. Pair it with treating the bed and harborages — encasements, interceptors, vacuuming, and steam — to actually clear an infestation. The full approach is in our guide to getting rid of bed bugs. For whole-room heat, that’s a job for professional equipment, not a portable box.
Frequently Asked Questions
What temperature kills bed bugs in a heat box?
Sustained heat of at least about 118°F kills bed bugs and their eggs. Most heat boxes target 120°F or higher to ensure the center of dense items also reaches the lethal threshold.
How long do you leave items in a bed bug heat box?
Follow the manufacturer’s hold time once items reach temperature — typically a few hours. The clock starts when the items (measured by the probe), not just the air, hit the target, so the initial ramp-up doesn’t count.
Why shouldn’t I overpack a heat box?
Because bed bugs survive in the coldest spot inside, and a packed load leaves cold pockets that never reach lethal temperature. Loose loading lets hot air circulate so every item heats through.
Can I put electronics in a bed bug heat box?
Some electronics tolerate heat-box temperatures, but many don’t, and batteries and sealed/pressurized items can be damaged or dangerous. Check the manufacturer’s exclusion list, and when in doubt, leave electronics out and treat them another way.