Hey Chantal,

You're the one from saint jerome ?

There's either something wrong with your alarm, the heating system there might be creating some type of hot air circulation, someone kidding around or you have some ghost activities.
There's a building in downtown montreal corner saint catherine and mc gill. The alarm there is always going off for no apparent reasons and i have been hearing it for many years and nothing had changed. Usually at night when theres nobody there that the alarm goes off. Each time i pass by it at night i hear the alarm is activated. The building by the way IS giving off alot of ghost vibes from outside. So the activities causing the alarm to go off is most probably are caused by some kind of ghost/ghosts activities.

~Patrick

www.montrealparanormal.com

What brand and type of alarm system is it? Is it old? Have you check the contacts and if every windows are properly closed? Do you have an animal?