Spray for bed bugs works only on the bugs it touches while it's wet. Most bed bugs hide in seams, cracks, and wall voids where a can never reaches them, and many NYC populations resist the most common store-bought chemicals. A spray can kill a few bugs. It rarely ends an infestation in an apartment.
That's the short version. The longer version matters, because the wrong spray used the wrong way can spread bed bugs into more rooms, into the apartment next door, and make a professional treatment harder once you call one in. Here's what actually happens when you spray, what the research says, and what we'd do in your shoes.
Does bed bug spray work at all?
Yes, on contact. Most over-the-counter bed bug spray is labeled "kills on contact," which means the liquid has to hit the bug directly. Once it dries, many of these products stop working.
That sounds fine until you think about where bed bugs spend their day. According to Texas A&M's Citybugs program, roughly 70% of the bed bugs in a typical infestation live on the mattress, box spring, and bed frame. The rest are tucked behind outlet covers, inside baseboard gaps, under loose wallpaper, and in the joints of your couch. You can't see most of them, so you can't spray most of them.
Why is "kills on contact" the catch?
If you can see a bed bug well enough to spray it, you can crush it or vacuum it just as easily, and for free. The value of any bed bug treatment is in what it does to the bugs you can't see. A contact spray does nothing to them.
Eggs are the second problem. A female lays eggs in protected cracks, glued in place, and most consumer sprays don't penetrate the eggshell. Two weeks after you've "handled it," a new generation hatches and the bites start again. This cycle is the single most common story we hear from Brooklyn tenants who tried to fix it themselves first.
Why does store-bought spray for bed bugs fail in NYC apartments?
Two reasons: resistance and building design. Both hit harder in New York than almost anywhere else in the country.
Are NYC bed bugs resistant to sprays?
Many are. The most common active ingredients in store-bought sprays are pyrethrins and pyrethroids, the same chemical class that has been used against bed bugs for decades. Researchers at Rutgers found that the majority of field bed bug populations are now resistant to pyrethroids, and they put "most consumer pesticide sprays" on their list of methods that don't work in their fact sheet on cost-effective and money-wasting bed bug control methods.
New York has been fighting bed bugs heavily since the mid-2000s. Populations that survived years of pyrethroid exposure in hotels, shelters, and apartment buildings are exactly the ones that are still here. A spray that works in a lab dish can do very little to a Bushwick walk-up's resident population.
Can spraying push bed bugs into other rooms?
Yes, and in a multi-unit building it can push them next door. Many pyrethroid sprays are repellent. Bed bugs detect them and move away rather than die. In a single-family house that means they scatter to another room. In a Brooklyn brownstone or a prewar Manhattan building, they travel through shared wall voids, along heating pipes, and under doors into the neighboring apartments.
Rutgers researchers made the same point about multi-occupancy housing: when more than a few apartments are infested, a building-wide approach is necessary. You can spray your own unit perfectly and still get reinfested from the apartment above you.
What spray is good for bed bugs, if you use one?
If you're going to use a spray, choose an EPA-registered product that lists bed bugs on the label, says it can be used indoors, and ideally combines two different modes of action. The EPA has registered more than 300 products for bed bugs, and they are not interchangeable. Here's how the common options compare.
So what spray is good for bed bugs? A combination product used as one piece of a larger plan, not as the plan. If you take one thing from this table, take this: dusts in voids plus physical methods beat any can of spray used alone.
Which DIY methods work better than spraying for bed bugs?
Heat, containment, and monitoring do more than spraying for bed bugs. None of these methods needs special licensing, and all of them make a later professional treatment work faster.
- Hot dryer cycles. Run bedding, clothes, and curtains through a hot dryer for at least 30 minutes. Heat kills every life stage, including eggs.
- Mattress and box spring encasements. A zippered encasement traps any bed bugs inside and removes dozens of hiding places. Leave it on for at least a year.
- Interceptor traps under bed legs. These catch bugs climbing up to feed and tell you whether the problem is shrinking. Rutgers researchers found traps alone detected 95% of infestations in a building-wide inspection.
- Steam. A steamer that reaches about 212°F kills bed bugs and eggs instantly along mattress seams, sofa joints, and bed frame corners. Move it slowly.
- Vacuuming. Vacuum seams and cracks, then seal the bag or canister contents in a plastic bag and take it straight to the outdoor trash.
- Freezing small items. Books, shoes, and electronics can go in a sealed bag in the freezer for four days.
Don't move to the couch. Switching where you sleep is one of the most common mistakes, because bed bugs follow the carbon dioxide you exhale and simply relocate with you.
Should you spray before the exterminator comes?
No. If you've already booked a bed bug inspection or treatment, stop spraying. Most bed bug guides skip this advice, and it's the one that saves our customers the most time.
Here's why. A technician finds an infestation by reading where the bugs are concentrated: the fecal spotting, the shed skins, the live bugs clustered in a headboard joint. Repellent sprays scatter that evidence. Bugs that were all in one bed frame end up spread across three rooms, and the treatment area grows with them. Leftover residue on surfaces can also interfere with the products a professional applies.
The better use of the days before your appointment: bag and hot-dry your fabrics, reduce clutter around the bed, and leave everything else as it is. Your technician will give you a prep list specific to your apartment.
What does a professional bed bug treatment do differently?
A professional treatment reaches the bugs and eggs that a spray can't, and it keeps going until they're gone. At OnGuard, every bed bug treatment in Brooklyn follows the same three steps we use for all pests: detect, eliminate, prevent.
- Detect. A full inspection of the bed, furniture, baseboards, outlets, and adjoining rooms to find where the bugs are actually living.
- Eliminate. A combination of methods matched to your space: products with different modes of action to get around resistance, dusts placed in wall voids and outlets, and treatment of the furniture joints where eggs hide.
- Prevent. Follow-up visits timed to catch eggs that hatch after the first treatment, plus sealing and pest-proofing to cut off routes from neighboring units.
There is also a legal difference. New York requires anyone who applies pesticides for hire to hold a certification from the state Department of Environmental Conservation. A certified technician can use materials and application methods that aren't available off the shelf, and knows which products are safe for a home with kids or pets. If that question is on your mind, our post on whether pesticides are harmful to people and pets covers it in detail.
Who pays for bed bug treatment in a NYC rental?
In most NYC rentals, the landlord does. The NYC Housing Maintenance Code requires owners to keep units free of pests, and bed bugs are included. If you rent, report the problem to your landlord or building manager in writing before you spend money on sprays.
NYC also puts bed bugs on the public record. Under Local Law 69, owners of multiple dwellings file an annual bed bug report with HPD every December, covering the previous November through October, and share it with tenants. Landlords must also give new tenants the building's bed bug history for the previous year before a lease is signed.
If a landlord ignores the problem, you can file a complaint through 311. The process works much like the one in our guide to whether landlords are responsible for mice in NYC, including the documentation that helps your case: dated photos, bite records, and copies of every written request.
Property managers and building owners dealing with more than one affected unit should look at a building-wide plan. Our commercial pest control team handles multi-unit buildings across Brooklyn, Manhattan, Queens, and Staten Island.
How long does it take to get rid of bed bugs?
With professional treatment, most apartments are clear in two to six weeks. The timeline depends on how long the infestation has been growing, how much clutter the bugs can hide in, and whether neighboring units are also affected.
Plan for more than one visit. Bed bug eggs hatch over roughly one to two weeks, so a single treatment almost never catches every generation. A good rule from the Rutgers researchers: only stop treating once you've gone a full month without finding a bed bug in your traps or on a careful inspection. With store-bought spray alone, many people are still fighting the same infestation months later.
Frequently Asked Questions
Does bed bug spray work on eggs?
Mostly no. Most consumer sprays don't penetrate the eggshell, which is why infestations come back one to two weeks after spraying. Heat from a dryer or steamer kills eggs reliably.
Can I spray for bed bugs on my mattress?
Only with a product whose label specifically allows mattress use, and only after it has fully dried. An encasement over the mattress is safer and does more, because it traps every bug inside instead of reaching only the ones you hit.
Is bed bug spray safe for kids and pets?
Label-approved indoor products are safe when used exactly as directed, which usually means keeping children and pets out of the room until surfaces are dry. Overapplying spray doesn't kill more bed bugs. It only raises exposure.
Should I use a bug bomb for bed bugs?
No. Research from Ohio State showed foggers are ineffective against bed bugs because the aerosol never reaches the cracks where they hide. In an apartment, multiple foggers also create a real fire risk.
How do I know if the spray worked?
Use interceptor traps under the bed legs and check them weekly. New bites, fresh blood spots on sheets, or live bugs in the traps after two weeks mean the infestation is still active. Check our bed bug help for Williamsburg and Bushwick apartments if you're in North Brooklyn.
When is it time to call a bed bug exterminator in Brooklyn?
Call when you've found live bed bugs in more than one spot, when bites continue after two weeks of your own efforts, or right away if you live in a multi-unit building. The longer bed bugs spread through shared walls, the bigger and more expensive the treatment becomes for everyone in the building.
OnGuard is a family-owned, eco-friendly pest control company serving Brooklyn and the rest of New York City, with same-day and next-day appointments for bed bugs. Read what customers say on our reviews page, learn more about our residential pest control for apartments and homes, or book a bed bug exterminator in Brooklyn and put the spray can down for good.
