When you're looking for a home security company, you'll find both large companies (like ADT and Brinks) to smaller companies that are authorized installers for the big guys. In the middle are medium sized firms that offer affordable prices for their security services.

It will depend on the size of the company, but most of them provide multiple services such as assessing your security needs, installing the equipment and central monitoring. The best security companies do extensive background checks on all their employees and are UL (Underwriters Laboratory) certified.

The larger companies like ADT and Brinks tend to have the most leading-edge equipment. They spend a lot of time and money keeping their equipment up to date. This includes their monitoring stations, which tend to have the best technology available to keep track of their customers' homes.

When you first contact a security company, they'll most likely send someone to do an assessment. They will determine what kind of security threats your home faces, and advise you on the best equipment and services to protect it.

It may seem obvious, but you should get an estimate from them as well. Some of the smaller companies may try to fast talk you into signing up, but you're best to get a few estimates before making your decision.

When you make your decision, you want to be sure it's the best solution for your needs. Some security companies require you to sign a contract for a certain length of time. Once you're signed up, it can be tough (and expensive) to get out of the contract.

Some of the things you should check when talking to different security companies include:

- How long have they been in business? - Do they have the relevant licenses and certifications? - Are they insured against damages during the alarm installation?

To get a complete list of your local security companies, the best place to check is the National Burglar and Fire Alarm Association (www.alarm.org).

You might also want to talk to your friends and neighbors and see if they have any recommendations.

John Lenaghan writes about driveway alarms and other security-related topics on the Home Security Guide website. For more information visit http://www.home-security-guide.com