Welcome... Whether a residential or commercial customer, taking specific security precautions has become essential in today's society to achieve a productive business, piece of mind and family safety. At Harford Alarm Company, safety of your home or business is OUR business. Harford Alarm understands the security needs of homeowners and businesses. We've been installing custom systems for over two decades and we know that a bigger alarm company isn't always a better alarm company. We Gain Customer Loyalty the Old Fashioned Way...We Earn It!!