There are two main choices when you decide to buy home intercom systems. Those choices are between a wired intercom or a wireless home intercom system.
Really the only way you would decide to buy a wired system is if you already have an old one installed in your house, or you are building a new house. Otherwise the installation cost of running the wires would be too high.
If you are building a new house, you can simply have the electricians run the wires for the system when they are doing the rest of the electrical and phone wiring. They can also do the final installation of the units after the drywall is installed.
If this is the route you want to go, you just need to give the electricians the installation manual for the system so they can see what kind of wire they need to run, and so they know what to quote you for final installation cost. There is nothing too complicated about installing modern home intercom systems so any electrician or even a telephone system installer should be able to do it.
To choose a wired system you really just need to find one that has the features you are looking for. Most of them come with a built-in AM/FM radio, but you may want one with a CD player too. If you want to go really basic, and spend less, you can get a basic system with no music.
If you have a house that isn’t wired for intercom, then the best choice is to go with a wireless system. These may be attractive to you even if you have an existing wired system. One of the advantages of a wireless system over a wired system is that the units are more portable. If you are sitting in your favorite chair and someone pages you, with a wired intercom you have to get out of your chair and go to where it is installed to talk back to someone. With a wireless system, you can put a portable unit by your chair and just reach over and press a button.
If you like the looks of a home intercom system that is installed in a wall, you can get wireless units that have a combination of flush-mounted wall units, along with portable units. So you have wall-mount units in some rooms, and a few portable ones in strategic locations that will talk to the wall units.
The advantages of a wired intercom system over a wireless one, is that you never have to worry about interference from some other wireless device. Some wireless systems minimize this possibility though. If you are building a new house, it would still probably be wise to consider a wired system. There is never a cheaper time to install wires in a wall than before the drywall goes up.
So the right home intercom system choice for you just depends on your personal choice and the house you are installing it in. Either way you go, you’ll appreciate not having to shout at your family members every time you need to talk to them. That’s truly the biggest benefit of home intercom systems.