After years of extensive testing, we have found this to not be the case. For maximum effectiveness, however, we still recommend that you periodically vary the location you place it in and the time you run it for which can be achieved with one of our accessory timers. For stubborn pests, use a timer with the unit or try our wireless motion sensor. On some of our units, you can elevate the inflatable using a 4” sewer and drain pipe (not schedule 40) to help enhance its effectiveness.