Once you’ve confirmed bed bugs, the next real decision is which treatment method fits your situation. Neither is universally “better” — they suit different circumstances. Here’s how to think it through.
Heat treatment raises the room to a temperature that’s lethal to bed bugs at every life stage in a single session. Research on bed bug thermal tolerance has found that bed bug eggs require higher temperatures to guarantee full mortality than adults do, which is why professional heat treatment equipment is calibrated to sustain temperatures well above the documented lethal threshold for long enough to reach hidden areas, not just open surfaces.
Chemical treatment applies residual insecticide to mattresses, furniture, and cracks/crevices, usually over two to three visits spaced a week or two apart, allowing later visits to catch eggs that have since hatched.
| Heat Treatment | Chemical Treatment | |
|---|---|---|
| Speed | Often resolved in a single session | Typically 2-3 visits over 2-4 weeks |
| Cost | Higher upfront, from £400+ per room | Lower upfront, £150-200 for a 1-bed property |
| Chemical residue | None | Some residual product remains for weeks |
| Preparation needed | Moderate — clearing items that can’t tolerate heat (candles, some electronics) | More — washing bedding, decluttering between each visit |
| Best for | Fast resolution, households with young children/pets, single confirmed room | Budget-conscious, smaller/early-stage infestations, multi-room spread |
Yes, in some cases — heat for a fast initial knockdown, with a residual chemical application afterward for ongoing protection against reinfestation from adjoining areas. We’ll advise whether this makes sense for your property during inspection.
The Extermination process includes a thorough inspection of your property, sealing off entry points to stop future infestations, using safe and effective pesticides and rodenticides, and providing a warranty.
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In most cases, yes — heat can resolve an infestation in one session, while chemical treatment typically needs a second and sometimes third visit to catch eggs that hatch after the first treatment.
Not usually — we'll confirm safe re-entry timing after each visit, typically a few hours once treated surfaces are dry.
Most household items tolerate professional heat treatment safely, but a small number of items (some electronics, candles, certain adhesives) need to be removed beforehand — we'll give you a specific list during the pre-treatment call.
Both are highly effective when carried out correctly and thoroughly — the real-world difference in outcomes usually comes down to whether every hiding spot was actually reached, not which method was chosen.
24/7 emergency response for all common London pests including rodents and insects. Contact us today for a free quotation and guaranteed results.