techmastr.com In Business since 1997. A+ BBB Rating. Licensed In NC & SC, Fully Insured. Warranty on All work. Free Estimates. We offer Emergency Service 27 / 7 / 364. If you want great Service at Competitive Prices, give us a call. We offer Senior Citizen & Military Discounts. Over 35 Years Experience in Electrical, Networking, Audio, Video, and HVAC Service & Repair. See our website for a partial list of our clients, and completed projects.