Any effects to the people living in the house with having these plugged in continuously?

Thank you for your enquiry. Leaving the Pest Clear 400 pest repeller plugged in continuously is generally considered safe for humans and pets. These devices emit ultrasonic sound waves that are designed to deter pests but are typically inaudible to humans and pets. However, prolonged exposure to any device can lead to concerns about electromagnetic fields (EMFs), though the levels from these types of devices are usually low and not deemed harmful.