3. 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 more than just crime prevention. Protection from natural disasters, home appliance malfunctions, and medical emergencies should also be considered. In addition to providing more comprehensive protection, complete home security systems that are backed by professional monitoring services may also qualify customers for discounted homeowner’s insurance premiums of up to 20 percent. Learn more about professional home security monitoring here. Learn more about how much home security systems cost here. Minimum $49. 99/month services agreement required. Minimum $599. 99 equipment purchase may be financed subject to an agreement with one of Vivint’s financing partners.