Motion sensors detect motion by looking for body heat moving in a room. There could be several potential causes to motion false alarms, the most common being the following:
- People or animals still inside the home or business
- Installed too close to the ground
- Facing a window
- Installed near a heating or cooling vent
- Facing a reflective surface
- Installed upside down
Most false alarms with motion sensors can be avoided with proper installation and location. The following are key points to consider when installing the motion sensor to avoid false alarms:
- Install at 7.5 feet high on the wall (roughly the height of a doorway). If the motion detector is too close to the ground, smaller heat sources may look larger and cause a false alarm.
- Avoid pointing the motion detector at windows. Though motion sensors can't see through glass, heat from outside such as a setting sun can bleed through and cause false alarms.
- Don't install facing any obstacles that a pet could climb on. Though the pet may be less than 40lbs, if they are on a table or counter, they may look larger to the motion sensor and cause a false alarm.
- Don't install in non-climate controlled areas, such as garages, sheds, or attics. If the room the motion sensor is in is too warm, it could cause false alarms or prevent the motion sensor from seeing body heat.
- Avoid installing near bathrooms with a shower or bath. Steam or excess humidity could trigger the motion sensor and cause a false alarm.