Home security might even be free. Most insurance companies will give a discount on your homeowners insurance for having a monitored security system This discount can ad up to around 20%, and there are even companies that offer up to 40%/ Although a monitored system can cost you around $40 a month, the money you save on your insurance might pay for it. Lately there are companies that offer free installing for their system. 2:You have to pay every month for the monitoring. Many people do not like the idea of having to pay for their security system every month. Lately there are many security systems available that you can install yourself. Find one that will suit your specific situation and install it yourself. Many of the DIY products can be attached to a phone line and alert you or other pre programmed numbers. 3:I have a dog that will set off the alarm and will cause fall alarms. With the latest developments in home security systems there are sensors available that can be set at a certain height. There even are sensors available that can set for subject that way more than the pre set amount of pounds.