Founded in 1982, Sentry Installation, Inc. has been working with clients to provide security solutions for over 29 years. We are one of the largest, independent, locally owned and operated security companies in the Washington, DC metropolitan area. We primarily install First Alert Professional Security Systems a division of HONEYWELL, INC. ? these state-of-the-art systems are among the best in the industry. These systems are only a part of the puzzle. In order to receive the piece of mind and performance you deserve, you need a partner. Sentry Installation, Inc. works hard everyday to be your partner.