About
About HM Security HM Security is your local trusted ADT Authorized Dealer, offering high-quality home and business security systems for ~20 years in California. We've helped secured over 20,000 homes and businesses. Exciting news! We're opening a new office in Dallas, TX, starting May 2025. Visit us at 12222 Merit Dr. Suite 130, Dallas, TX 75251. Our Texas license number is TXB30885501.