The Egg Question

DOES HEAT TREATMENT KILL BED BUG EGGS?

Short answer: yes. Long answer: only when the heat is held above 47–48°C for long enough, at every point in the room — including deep inside the mattress, behind the skirting and inside wall voids. This page explains the biology, the failure mode of chemicals, and how we verify on every job that the eggs are gone.

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Why the egg is the whole battle

A bed bug infestation is not killed by killing the adults. A single adult female lays up to five eggs a day for most of her ten-month adult life. Those eggs are glued in tight clusters into mattress seams, headboard joints and inside the dust covers of divan bases. They are 1mm long, pearl-coloured, and almost invisible against a pale fabric. Any treatment that kills 100% of the adults but leaves 5% of the eggs has not solved your problem — it has delayed it by ten to fourteen days, after which the first hatch repopulates the property. That is exactly the failure pattern we see when we are called out to rescue a stalled chemical course.

The published lethal threshold

Peer-reviewed research on the common bed bug (Cimex lectularius) is unusually clear on the thermal lethality of the egg stage. The consensus figures, replicated across multiple US, UK and European university labs:

  • 45°C (113°F) — adult and nymph mortality begins.
  • 47–48°C (117–118°F) — egg mortality, sustained for ~90 minutes.
  • 50°C+ sustained — total kill of all stages within minutes.

We treat the room at 55–60°C, with a target soak of two hours at the coldest monitored point. That sits comfortably above the egg lethality threshold and gives a wide safety margin against cold spots inside mattress cores, wall voids and furniture cavities.

Why chemical sprays do not kill the egg

The bed bug egg has a hardened, multi-layered protein shell called the chorion. Its job in nature is to protect the embryo from desiccation and microbial attack. As a side-effect it makes the egg essentially impermeable to the liquid pesticide actives that work on adult insects. Pyrethroids, neonicotinoids and the modern combination products simply cannot reach the embryo through the chorion. This is not a controversial point — it is openly acknowledged in the manufacturer datasheets and is the entire reason chemical-only protocols always book a second visit.

How we verify the egg kill on your job

  1. Wireless probes go inside the mattress core, behind the headboard, inside the bedside drawer, behind the skirting at the coldest corner, and inside the wardrobe.
  2. Live readings stream to the technician's tablet throughout the cycle. We can see the moment every probe crosses 47°C and we hold the room until every probe has been above that threshold for at least two hours.
  3. The full temperature log is saved to your job file and emailed to you with the invoice. You have an evidence trail showing the kill.
  4. If any egg cluster somehow survived, you would see a fresh population of first-instar nymphs within 21–30 days. The written six-month guarantee covers exactly that scenario — we return and re-treat at no cost.

Can DIY heat methods kill the eggs?

A domestic tumble dryer on the hot setting will kill bed bug eggs in any clothing or bedding that fits inside it — this is genuinely useful aftercare. A handheld steamer at 120°C will kill eggs at the surface it touches, but cannot reach inside a mattress or behind a skirting. A domestic space heater cannot raise a room to 55°C uniformly and has no way to verify the kill. None of these methods touch eggs inside the structure of the property. That is why professional thermal remediation, with the equipment and monitoring, remains the only single-visit method that ends an infestation.

Where we deliver this service

We respond across London and the Home Counties on the same day. Click any location below for postcode-level coverage, response times and pricing for that exact area.

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Frequently asked questions

Does heat treatment kill bed bug eggs?

Yes. Bed bug eggs are killed by a sustained core temperature of 47–48°C. Professional heat treatment holds the entire treated environment above 55°C for hours, which guarantees the egg-killing threshold is reached inside mattress cores, headboard joints and every other harbourage.

Why don't sprays kill bed bug eggs?

The bed bug egg has a hardened protein shell (chorion) that is essentially impermeable to liquid pesticides. Active ingredient cannot reach the embryo. That is why chemical protocols require return visits timed to the hatch cycle — they wait for the eggs to hatch into vulnerable nymphs and spray again. Heat sidesteps the problem entirely.

How long do bed bug eggs take to hatch?

6–10 days at normal room temperature. A female bed bug glues eggs in clusters into seams, joints and crevices. A single missed cluster of 20 eggs will repopulate an infestation within three weeks.

How do you know the eggs were killed?

Two ways. First, the wireless temperature log shows every monitored point — including probes placed inside the mattress and behind harbourages — exceeded 47–48°C for at least two hours. Second, the six-month guarantee: if any eggs had survived, you would see a fresh population within 21–30 days and we would re-treat free.

Can the egg survive deeper inside the mattress?

No. We hold the room at 55–60°C for 4–8 hours; the core of even the thickest pocket-sprung mattress reaches the lethal threshold within the soak window. Wireless probes inserted into the mattress core confirm this on every job.

What about eggs glued inside electrical sockets and wall voids?

The same hot air that fills the room fills the wall voids and socket cavities, and we place probes in the coldest expected void to confirm. After the cycle we apply a residual dust inside sockets and skirting voids so that any rogue first-instar nymph that walks out is killed on contact.

Related guides

One visit. Eggs included. Written guarantee.

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