What do exterminators do?

What the visit is actually for

The mental model most people bring is that a technician arrives, sprays, and leaves, and that the spraying is the service. That model is why so many people feel a visit was a waste when the technician spent forty minutes looking at things and ten minutes treating.

It is backwards. The inspection is the product. Everything that decides whether the problem ends — which species it is, where it lives, how it is getting in, what is feeding it, whether the population is growing — comes out of the inspection. The treatment is a consequence of what the inspection found, and it cannot be better than the findings it rests on.

A technician who treats without inspecting is guessing at the job, and you are paying for the guess.

What a competent visit covers

Identification. Confirming the species, not the category. Ants and termites, German and American cockroaches, bed bugs and bat bugs, mice and juvenile rats — each pair leads somewhere different.

The harbourage. Where the population actually lives, which is rarely where you saw it. German cockroaches and bed bugs both spend most of their time in tight cracks and voids, so what is visible on a surface is a small fraction of what is there.

Entry points. Gaps at utility penetrations, door sweeps, weep holes, garage seals, foundation cracks, soffit and roof-line gaps. This is where the recurrence question is decided.

Conducive conditions. Moisture, standing water, wood-to-soil contact, food storage, refuse handling, clutter that provides harbourage. These are the things that make a property hospitable, and correcting them outlasts any treatment.

Extent. How far it has gone. This is the single largest driver of what the job will cost, and it is the number the inspection exists to establish.

Monitoring placement. For anything where the population size is uncertain, monitors turn the next visit into a measurement rather than another opinion.

What you should receive afterwards

At minimum, in writing:

• The species identified, and how it was identified.
• Where evidence was found, with locations specific enough to check.
• The conducive conditions observed and what to do about them.
• What was treated, where, and with what product.
• What happens next, and what you should see if it is working.

If a company cannot produce that, it did not do an inspection. For termite work, a written inspection report is standard practice and in many states it is a regulated document with its own requirements; for bed bugs, the extent recorded in the inspection is what determines whether the job is one room or the whole unit.

What a technician can do that you cannot

This is the honest case for hiring one, and it is narrower than the marketing suggests but real.

Products you cannot lawfully buy. Restricted-use pesticides may only be applied by or under the direct supervision of a certified applicator. Termiticides applied as a soil treatment are the clearest example.

Equipment and access. Sub-slab injection, wall-void treatment, whole-room heat, crawl space and attic work. Most of this is not a matter of skill alone; it is a matter of owning equipment that is not sold to households.

Repeat exposure. A technician who has seen several hundred German cockroach jobs recognises a pattern in a kitchen faster than someone seeing their first.

Liability and a guarantee. A written guarantee has value in proportion to what it actually covers — which is the thing to read closely, not the thing to be reassured by.

What a technician cannot do

They cannot make a treatment outlast the conditions that caused the problem. If the entry point is open and the food is available, a treated population rebuilds, and the next visit is billed. This is the mechanism behind a great many multi-year contracts that never resolve anything.

They also cannot lawfully use a product in a way its label does not permit. The label states the sites, rates, and intervals, and using a product inconsistently with its labelling is a violation of federal law. If a technician offers to do something the label does not allow, that is disqualifying, not accommodating.

The questions that separate the good visits from the bad

• What did you find, specifically, and where?
• What species, and how did you confirm it?
• What is making this property attractive, and what should I change?
• Is this a one-time treatment or an agreement, and what is the minimum term?
• What exactly does the guarantee cover, and what voids it?
• What should I see over the next two weeks if this is working?

The last one matters more than it looks. A technician who can tell you what success looks like has a model of the problem. One who cannot is selling visits.