QUALITY. LOYALTY. INTEGRITY.
Our Services and Divisions
Warner Mechanical
Warner Mechanical, a proud division of R.W. Warner, Inc., has served as a trusted provider of expert HVAC and plumbing services in Frederick, Maryland, and the surrounding region for over 88 years. We are built on a legacy of quality workmanship, dependable service, and long-standing relationships.
Kaempf & Harris
Kaempf & Harris Sheet Metal provides precision fabrication and expert installation in Frederick, MD, and the surrounding region. We specialize in high-quality, custom metal solutions for complex commercial, industrial, and institutional projects, from intricate HVAC ductwork to custom components. Our integrated service ensures seamless quality control from initial design through meticulous on-site installation.
Warner Construction
With over 88 years of legacy, Warner Construction provides expert commercial General Contracting and Construction Management services in Frederick, MD. We deliver high-quality, dependable construction solutions for diverse, complex projects, offering comprehensive oversight from conception to completion. Partner with us to bring your building vision to life successfully and efficiently.
Williams Electric
Williams Electric, a division of R.W. Warner, Inc., offers expert electrical contracting in Frederick, MD. Our licensed team handles commercial and industrial projects of any size. We provide comprehensive services from installations and repairs to panel upgrades, generators, and lighting, ensuring safe, reliable, and lasting performance for your power needs.
At R.W. Warner, Inc., our mission is to deliver exceptional commercial construction projects through an unwavering commitment to quality control, safety, and excellence. Through the Warner Quality program, our team ensures every project is executed with precision and held to the highest industry standards from start to completion. This commitment is reinforced through dedicated oversight and training led by our Quality Control Managers and Quality Control Superintendents, including Army Corps of Engineers CQMC certifications, EM-385-1-1 certification, pre-construction meetings, pre-installation onsite meetings, follow-up and observation meetings, and job-specific quality training.
At R.W. Warner, Inc., maintaining a safe and healthy work environment is an obligation to our employees, their families, our clients, and the communities we serve. The prevention of occupational injuries and illnesses is our highest priority, and no task is so urgent that it cannot be completed safely. This commitment is reinforced through comprehensive training led by our Safety Managers and Safety Professionals, including programs such as OSHA 30 and OSHA 10 certifications, fall protection training, mobile elevating work platform training, scaffolding, confined space training, CPR/First Aid/AED certification, hazard communication, powered industrial truck training, respiratory protection, lockout/tagout, asbestos awareness, fire prevention, and safety leadership and accountability. In recognition of this dedication, the Warner companies achieved ABC STEP Platinum in 2026, reflecting our continued commitment to industry-leading safety performance.
Project Showcase
BEST.SERVICE.EVER!! I called Jay Monday because a friend recommended him to me. His service is second to none!!! He is honest, dependable, and affordable! I wanted to run natural..
We recently needed to replace a complete AC unit that was over ten years old. We did our research and found Jay and The Cooling & Plumbing Co. on Yelp. The customer service and professiona...
We recently needed to replace a complete AC unit that was over ten years old. We did our research and found Jay and The Cooling & Plumbing Co. on Yelp. The customer service and professiona...
We recently needed to replace a complete AC unit that was over ten years old. We did our research and found Jay and The Cooling & Plumbing Co. on Yelp. The customer service and professiona...
