[Sorry if this is a duplicate. I tried to subscribe to replies and appear to have deleted the original.]
My place gets broken into a lot, usually by breaking and climbing through the windows. At this point I stopped fixing the windows and just put boards or cardboard over them, which I know invites more break-ins, but I can’t fix a broken window every single week.
So… I thought motion sensors would be my best bet. Yesterday, I installed a bunch of Qolsys IQ S-line motion sensors. I set up my motion sensors high in the corners of my rooms, pointing at 45 degrees away from windows and slightly downwards. I placed them 8-9 feet off the ground, higher than the recommended 6.5, in the hopes that they would be harder for the intruders to damage. I tested them and they still triggered fine.
Today, one of the motion sensors triggered twice. The first time seems to have been a false alarm. The second time I haven’t investigated yet.
Last night someone did break in and ripped one of the sensors off the wall, but that sensor seems to be okay and work fine still. It is a different sensor that has triggered twice. That sensor is mounted slightly higher than the one they ripped down and appears not to have been touched by the intruders, though it’s of course possible they somehow sabotaged it. The intruders like to break in regularly, so are always looking for ways to make it easier to get back in.
Any suggestions on what might be causing false alarms? There are windows in the room, but the motion sensor is in the corner, angled diagonally away from them. The room is completely empty and isn’t especially sunny. There’s a gate about 25 feet away, so people shouldn’t be able to get that close from the street. It’s possible someone could be shining a flashlight or laser pointer into the room to trigger false alarms and discourage the police from responding, but the sensor is not directly visible from the window, being in the corner of the room.
Any other suggestions on how to deal with this? I thought about image sensors, but I would want to point those towards the windows to see who is climbing in, and that presumably would cause even more false alarms. Should I install two motion sensors in the same room and only consider it a real alarm if they both trigger?
I really want these people to stop breaking into my house, and I fear they will stop only once the sensors are accurate enough to send the police over every time the alarm triggers. The ordinary door/window sensors do nothing for people climbing through windows (or trigger only at the end when the intruders are leaving).