In the heat vs chemical treatment for bed bugs question, each method wins at something different. Heat kills bed bugs at every stage, eggs included, usually in one visit, but it leaves nothing behind to stop bed bugs that come back. Chemical treatment keeps working where it’s applied, but it usually needs follow-up visits, and many bed bugs now resist common pesticides. For many NYC apartments, the best plan uses both.
Picking only one can cost you months: spray after spray on an infestation heat could have cleared, or a heat treatment with nothing in place for the next bed bug that walks in.
| What matters | Heat treatment | Chemical treatment |
|---|---|---|
| Kills eggs | Yes, when the heat is held long enough | Eggs are harder to kill |
| Visits | Usually one day | Usually more than one visit |
| Protection afterward | None | Keeps working in the cracks where it’s applied |
| Pesticide-resistant bed bugs | Heat still kills them | Can survive |
| Time out of the home | Most of a day, for everyone | Set by the product label |
| Prep | Remove heat-sensitive items | Clear clutter and bag loose items |
| Cost | Often costs more upfront | Often costs less per visit |
Why sprays alone often fall short
Bed bugs are becoming more and more resistant to pesticides, University of Kentucky entomologists note, and follow-up visits are usually needed. Store-bought products are worse: University of Minnesota Extension says over-the-counter insecticides aren’t effective against bed bugs, and bug bombs barely reach the cracks where they hide. Eggs are the other problem. The EPA notes that bed bug eggs resist many control methods, chemical and non-chemical.
Why heat alone isn’t the end of it
Heat clears what it reaches, often in a day, but it can’t protect against bed bugs that come later. The EPA says heat treatments have no lasting effect. And heat can miss cool spots: Virginia Tech’s 2024 guide says even the best heat treatment isn’t always 100% successful.
Why many treatments use both
Virginia Tech’s guide recommends a long-lasting insecticide after the heat, aimed at the hard-to-heat spots. It adds that a heat-only company can’t legally apply pesticides, so a certified pest professional can do both. University of Kentucky entomologists note that some companies apply insecticides at the same time as the heat.
That’s how we usually work: heat to clear the infestation, then a targeted treatment of the cracks and outlets where bed bugs could come back. The inspection decides whether you need one or both.
What about fumigation?
Fumigation fills a sealed building with gas. Everyone has to leave until the gas is cleared, the prep is extensive, and it can take several days. Like heat, it leaves nothing behind once it’s over. It’s usually saved for severe infestations that have spread through a whole building, or for cases where other treatments haven’t worked.
In an apartment building
Whichever method you choose, one apartment is rarely the whole story. In New York City, owners have to inspect the apartments across from, above and below an infested unit, and bed bugs are a Class B violation with 30 days to correct, according to the NYC Health Department. The EPA adds that in multi-family housing, building management has to take part for control to work. See how we plan pest control for apartment buildings.
Here’s a simple example. Say a landlord has a tenant’s apartment sprayed three times in two months, and the tenant still finds bed bugs. The bugs were surviving the spray and hiding in the couch and the outlets. Heat clears that apartment in one day, a targeted product goes into the cracks and outlets afterward, and the apartments on either side and above get inspected. That’s two visits instead of a fourth spray.
Not sure which you need? Read how to tell if you need heat treatment and what temperature kills bed bugs. Then see our bed bug heat treatment and bed bug exterminator services, or call (347) 988-2315 for a free on-site inspection.
Frequently asked questions
How many chemical treatments does it take to get rid of bed bugs?
Usually more than one. Sprays don’t reach every egg and every hidden bug the first time, and University of Kentucky entomologists note that follow-ups are usually needed. We set the schedule after the inspection.
Does diatomaceous earth work on bed bugs?
Not well on its own. University of Kentucky entomologists say it’s messy to apply and seldom helps much to get rid of an infestation.
Do I have to leave home for a chemical treatment?
Often, for a while. The product label sets how long people and pets stay out of treated areas, and the EPA says to follow it every time. Your technician will tell you before starting.
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