Silverfish are unable to reproduce or even to survive in buildings where winter heating and moisture loss results in low relative humidity. Airtight houses with efficient humidifiers that keep the relative humidity above 50% year-round can develop silverfish infestations that are very difficult to control using typical insecticide applications. To achieve control under those conditions, the relative humidity will need to be reduced. Besides cleanup of clutter and other food items that may be supporting the infestation, insecticide applications are required for silverfish management.