Determine your needs before contacting an alarm company.
A security system is not something that you should buy off the shelf; your system should be customized to meet your needs, as well as your finances.
An on-site evaluation by the alarm company is essential before an educated quote can be provided to you.
Contact the National Burglar and Fire Alarm Association (NBFAA) for a list of member companies in your area. Association members agree to maintain a high level of conduct under its National Code of Ethics and to render services at the highest level of quality.
Ask each alarm company to conduct an inspection, make a recommendation, and provide a detailed quote in writing, indicating the length of time the quote is valid (30 days for example). You would be wise to obtain a minimum of three quotes before making a decision.
Contact your local police department's crime prevention department, state licensing agency, consumer protection agency, and the Better Business Bureau to find out any/all information on file for each company.
Ask your insurance agent, friends, family or neighbors for referrals.