Yes, heat kills termites. When the temperature inside infested wood reaches about 120°F (49–50°C) and stays there for at least two hours, it produces 100% mortality. This makes heat treatment a legitimate, chemical-free option for eliminating drywood termite colonies, though it comes with important limitations worth understanding before you commit.
The Exact Temperatures That Kill Termites
Termites don’t tolerate sustained high heat. The key factor isn’t just how hot the air gets in a room, but how hot the wood itself gets at its core. Termites live deep inside structural timbers, so the lethal temperature has to penetrate all the way through.
Research has established a few temperature and time combinations that achieve complete kill:
- 130°F (54.4°C) for one hour: Complete mortality observed in drywood termite species in laboratory studies.
- 122°F (50°C) for two hours: Effective in field conditions, including inside thick wooden blocks and hard-to-reach voids like toe-kick spaces beneath cabinets.
- 115°F (46°C) for two hours: The lower end of the effective range, though professionals typically aim higher to build in a safety margin.
The two-hour window matters because of what researchers call the “heat sink effect.” Dense wood, concrete, and other heavy materials absorb heat slowly. Even when the surrounding air is well above the target temperature, the interior of a thick beam can lag behind by a significant margin. Professionals monitor temperatures at the slowest-heating points in the structure to confirm the wood core, not just the room, has reached lethal levels.
How Professional Heat Treatment Works
A pest control crew brings in industrial propane or electric heaters and fans, then seals the treatment area. For a whole-house treatment, the entire structure is tented or closed up. For a localized treatment, they may heat only the affected room or wall section. Temperature sensors are placed throughout the space, including inside wall cavities and near thick wood members, so technicians can verify that every infested area reaches the target.
Once all sensors confirm the threshold temperature, the heaters run for an additional two hours before being shut off. The whole process typically takes several hours from start to finish, depending on the size of the space and how much thermal mass (thick beams, concrete, dense cabinetry) the heaters need to overcome. You’ll need to leave the home during treatment, but you can usually return the same day once temperatures drop back to normal.
What You Need to Remove Before Treatment
The temperatures that kill termites can also damage certain household items. Before the crew arrives, you’ll need to take out anything heat-sensitive. According to Virginia Tech’s pest management guidance, the list includes:
- Fire and explosion risks: Aerosol cans, cigarette lighters, candles, and any combustible materials.
- Living things: Pets, houseplants.
- Heat-sensitive items: Medications, lipstick and cosmetics, non-refrigerated produce, photographs, family heirlooms, and stringed instruments.
- Electronics: Televisions should be removed or wrapped in blankets. Other electronics should be disconnected from outlets.
Your pest control company will provide a specific preparation checklist. The prep work takes some effort, but it’s straightforward and usually the homeowner’s biggest time investment in the process.
Which Termites Heat Treatment Works For
Heat treatment is primarily effective against drywood termites. These are the species that build their colonies entirely inside wood, with no connection to the soil. Because the whole colony lives within the structure, raising the wood temperature high enough kills every member.
Subterranean termites are a different story. Their colonies are based underground, often with millions of individuals spread through an extensive network of soil tunnels. You can heat-treat the wood inside your walls and kill every termite present in the structure, but the colony beneath your foundation survives and can return. For subterranean termites, chemical soil barriers or bait systems are far more effective because they target the colony where it actually lives. Heat alone won’t solve a subterranean infestation.
Heat vs. Chemical Treatment
Both approaches work, but they solve different problems. Heat treatment kills every termite in the treatment zone on the day of service. It uses no chemicals, leaves no residue, and lets you return to your home quickly. The tradeoff is that it provides no lasting protection. The moment temperatures return to normal, there’s nothing stopping a new colony from moving in.
Chemical fumigation (tenting the house with gas) also kills drywood termites throughout the structure, and chemical soil treatments create a barrier that keeps subterranean termites out for years. Chemical options tend to cost less upfront and offer that residual protection heat cannot. However, fumigation requires you to vacate the home for two to three days, and some homeowners prefer to avoid pesticide exposure entirely.
For drywood termites in a localized area, heat treatment can be targeted to a single room or section of wall, which is faster and less disruptive than tenting an entire house. If the infestation is widespread across multiple areas, whole-structure fumigation may be more practical.
Limitations to Keep in Mind
Heat treatment’s biggest weakness is the lack of residual protection. It solves today’s infestation but does nothing to prevent tomorrow’s. In areas with heavy termite pressure, some homeowners pair a heat treatment with a preventive chemical barrier to get both an immediate kill and long-term defense.
The other challenge is ensuring complete heat penetration. Areas with heavy thermal mass, like thick hardwood beams, concrete-adjacent framing, or cabinets built against exterior walls, absorb heat slowly. A poorly monitored treatment might leave cool pockets where termites survive. This is why proper sensor placement matters, and why hiring an experienced company with good monitoring equipment makes a real difference in results. When temperatures are verified at every difficult-to-heat point, field studies confirm that complete mortality is achievable.