Services · System Upgrades

It’s a fact of life. To provide the best installations and service, you need the best people.

To this end, NSI has consistently recruited and developed our industry’s most skilled and talented personnel.

NSI’s experienced service and installation crews regularly stay abreast of all new products and technical information.




System Upgrades

We offer a full line of upgrades. 

If you currently have a security system that is outdated or not functioning properly, National Security can help.

Even if another company installed your equipment,
we will upgrade.

With the GE Concord 4, we can switch out your old system and replace it with a new Concord 4.  Your keypads and main security panel will need to be replaced.  Our skilled technicians will test your old contacts and ensure that the system is operating properly.  In the event that a problem is discovered, our technician will consult with you prior to making repairs.

National Security, Inc.
10410 Main Street
Fairfax, Virginia 22030

VA: 703-273-5555
MD: 301-656-6466
Loudoun Co: 703-771-1000
Toll Free: 800-886-0886
Fax: 703-273-0885