Do ultrasonic pest repellers work?
The short answer
The published testing does not support them for rodents or for common household insects. Animals habituate quickly, the sound does not pass through walls or furniture, and regulators in the United States have taken enforcement action over unsupported claims made for these devices.
Why the idea persists
Pest pressure is seasonal, so a device plugged in during a decline gets the credit for it. That is enough to keep a product category alive indefinitely, and it is why controlled testing rather than personal experience is the relevant evidence here.
What the money buys instead
- Sealing the gaps. It is the one intervention that works for rodents, and it works permanently.
- Traps, which are cheap, effective and give you a body rather than an uncertainty.
- Fixing the moisture and the food sources that are actually holding the population.
This is not a close call and it is worth saying plainly: nobody in this trade uses these devices, and the reason is that they do not work.
Also asked
- What about the plug-in insect repellers?
- The same evidence problem applies. Some plug-in devices disperse a chemical rather than a sound, which is a different product with a different label and different safety considerations, and should be assessed on that label rather than on the marketing.
Read next
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General information about pest problems and about hiring, not advice about your specific property. Pest control licensing, wildlife protection and landlord and tenant law are all set state by state and province by province across the United States and Canada, so your own regulator is the current answer. How we read the data.