Reliable low-voltage systems for modern homes and businesses -
installed with care, precision, and lasting performance.
Duff & Hennessey
Audiovisual & Media Labs • Security & Surveillance
What We Do
Fiber & Structured Wiring
Cat6 / Cat6A cabling and fiber runs installed with proper pathways, labeling, and testing for residential and commercial spaces.
Networking & Smart Homes
Network racks, switches, access points, and modern smart home automation systems.
Audiovisual & Media Labs
Design and installation of immersive media environments, home theaters, and custom high-performance PCs.
Security & Surveillance
Security systems and access control infrastructure designed for clarity, coverage, and protection.
About Duff & Hennessey
Duff & Hennessey is a Northeast Ohio installation firm built on the belief that modern technology is only as good as the infrastructure supporting it. We specialize in delivering carefully planned and precisely executed low-voltage systems that perform reliably for years.
From high-performance PC builds and media labs to complex fiber-optic networking and smart home integrations, we take a hands-on approach to every project. We prioritize clean aesthetics, proper pathways, and lasting performance, treating every home and business with the same level of care and respect we would our own. Our service area currently includes Geauga, Ashtabula, Cuyahoga, and Lake counties.