Makes no sense to secure your windows with too much effort.
All it takes is a rock to smash the glass out.
if you really want a deterrent, then security system is your only option.
Not if you have storm windows and an alarm. Having said that storm windows can be expensive
Glass is glass and the OP clearly is not thinking about installing hurricane type window, alarm is the only solution other then metal bars on the windows.
Once you have the metal bars on the windows, all one has to do is open up the door to the house. takes less then 30 ( more like 12) seconds to open the a standard locked door. More or less, there are endless ways to break into the standard home.
Quite honestly, people who have broken into homes before find it much easier to simply kick the door in, why bother getting all that messy glass out of the way :o) Less experienced will try the windows though because they dont know how easy it is to open a locked door.
The next one is another good one, your electric garage door. Most people do not lock the door from the garage that goes into the house because they have an electric garage door that no one can open without the code to the keypad or a remote control right?
Wrong, to open an automatic garage door takes someone who has practiced about 15 seconds and is even more easy then going through a window or door! :o)
Simply get a coat hanger, slip it into the garage, pull on the escape cord, lift up door.
(google opening an automatic garage door with a coat hanger)
or click here, this person does it in 6 seconds ... https://youtu.be/CMz1tXBVT1s
and why ... a good security system is the most effective and least expensive way your secure a home.
... as I mentioned before, a good security system is definitely not Simply Safe but it is better then nothing. To defeat Simply safe, once a thief breaks into a home, all he/she needs to do is pick up the simply safe "cone" shown in all their ads of the home you are breaking into and throw it in the refrigerator, this will block the unit from sending out its alarm signal to central station. The refrigerator blocks the cell signal because of its metal walls. You can test this out with your own cell phone.