The home security market offers many plug and play equipment packages that center around an audible alarm to deter intruders who trigger a door or window sensor. They do not offer professional monitoring, so there’s no monthly service contract involved. Monitored home security systems cost between $20 and $60 per month. Although criminology research suggests most intruders flee at the first sound of an alarm, complete home security offers much more than just crime prevention. Protection from house fire or water damage, and assistance with medical emergencies should also be considered. In addition to providing more comprehensive protection, complete home security systems backed by professional monitoring services may also qualify customers for discounted homeowner’s insurance premiums. Learn more about professional home security monitoring. Learn more about the cost home security systems. The home security market offers many plug and play equipment packages that center around an audible alarm to deter intruders who trigger a door or window sensor. They do not offer professional monitoring, so there’s no monthly service contract involved. Monitored home security systems cost between $20 and $60 per month.