There are a few things every house should have, such as modern alarm systems. These can include fire alarms and intruder alerts as well as carbon monoxide detectors. Also important for people in areas that see floods and storms are tornado sirens and flooding sensors.
Alarm systems in homes for the most part have motion detectors, so it's a good idea to have them connected to doors and windows. When someone enters, they will have a limited amount of time to shut off the alarm. Otherwise, the device will alert the police.
One of the most important systems to have is a fire alarm. Some of the older kinds of fire alarms can be annoying, so people just forgo getting one altogether. Older alarms beep relentlessly as the battery runs down, so some people take out the battery when it runs out and don't replace it because they figure they don't really need it. There's also the irritation of having the alarm go off when it detects smoke while you're cooking. Still, though you may not have been helped by a fire alarm in the past, it's important to have one as you may need it in the future.
To avoid some of the irritations in earlier models of alarms, make sure you get a modern alarm. With their more sophisticated equipment, they sense movements of flames rather than just a small amount of smoke, rather than sounding whenever you cook. Some are activated by smoke, but only when there is a significant amount of it so as to indicate a house fire. Still others are activated by temperature, so when it gets hot enough, the device signals the fire department and the siren goes off.
As for intruder alerts, there are a couple of types. One is silent, so when an intruder enters the house, they feel secure to move around in the house while the police have already been called. There is some risk in this if the intruder is not there simply to rob but to do injury to someone in the house. In that case, it is better to have the kind of alarm that sounds loudly the moment an intruder is detected. The sound will scare them off, leaving you and your family safe.
Another important type of alarm to have is one which detects carbon monoxide. These are very affordable and can end up saving lives. You simply plug it into an electrical outlet.
Also as mentioned before, if you live in an area with serious weather problems, it's a good idea to keep a flood detector in the basement. If your area sees tornadoes even occasionally, you should consider getting a home siren for tornadoes.
Any of these systems are good for both houses and businesses. It can also help you get a better deal on home insurance sometimes if you provide proof that your home has an anti-theft alarm and other alarm systems. Ultimately, a little extra expense can end up saving you in the long run and keep you and your family safe.