COMMERCIAL · DELMARVA
Commercial HVAC & Refrigeration
Full-service HVAC, electrical, controls, and plumbing for commercial, light-industrial, institutional, healthcare, and retail buildings across Delmarva.
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SEAFORD, DE · SINCE THE 1950s
Where Comfort and Integrity meet Lifestyle
A full-service mechanical contractor serving the Delmarva region since the 1950s — a local company with national resources.
- 60+
- Years in Business
- 40+
- Technicians
- 24/7
- Emergency Service
- 8
- Trades
WHAT WE DO · DELMARVA
Eight trades, one mechanical contractor
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Residential Heating & Cooling
Home Comfort Plans, equipment repairs, indoor air quality solutions, and 24/7 emergency service for Delmarva homeowners.
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Service & Maintenance
Residential Home Comfort Plans and Commercial Building Systems Plans — coil cleaning, filter changes, electrical checks, condensate service, and more.
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Indoor Air Quality
Humidification, filtration, GPS Needlepoint ionization, and ventilation — including asthma and allergy certified solutions and COVID-pathogen reduction.
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Installations
Commercial rooftop replacements and specialized equipment, plus residential American Standard high-efficiency systems — save up to 50% on energy costs.
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Plumbing
Backflow preventers, booster pumps, hydro-jetting, water testing, water heater service, and Home Comfort Plumbing Plans — your one-stop plumbing source.
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Electrical
Commercial and industrial electrical service and installation — VFDs, switchgear, generators, LED lighting upgrades, and building automation systems.
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FABRICATION · SEAFORD
Sheet Metal Fabrication
Custom commercial and residential sheet metal — pants, offsetting Y, flex connectors, square-to-round, plenums, transitions, and ductwork. Get it right the first time.
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EXCLUSIVE TO NATIONAL HVAC
Insights by National brings you complete knowledge of your systems directly to your device.
SEAFORD, DE At National HVAC we want you to see the work that we do on your systems, that's why we have introduced Insights by National, a tool dedicated to keeping you thoroughly informed of the work completed, and the work to be completed at your home or business.
When our technicians are on site, they take the time to document their work on our cloud-based platform. Pictures, Video, and notes are taken on each call to keep you and our service teams updated.
This tool then allows us to build a history of your equipment, meaning if another tech was to visit, he or she can take an image of the unit's data plate and then pull up service manuals, and previous insights history making working on your systems much more efficient.
Once our call is completed, we then send you a call summary with a link to preview our work which takes you into your mechanical room, up on your facility's roof, or into your crawlspace at home, letting you see the work performed and the condition of your equipment. This insight into your systems is exclusively available through Insights by National from National HVAC Service.
FROM THE FIELD · DELMARVA
Recent work
TRUSTED ACROSS DELMARVA
A local company with national resources
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American Standard Dealer
Authorized dealer — #1 in customer satisfaction.
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Part of Service Logic
The largest privately-owned HVAC service company in the U.S.
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Western Sussex Chamber of Commerce
Active member serving the Delmarva business community.
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Wells Fargo Financing
Up to 60 months, no interest — ask about qualifying equipment.
SERVING NOTABLE DELMARVA CLIENTS
K&L Microwave · WMDT TV · Johnny Janosik · Crossroads Community Church
WHAT OUR CUSTOMERS SAY
Reviews
The key to K&L Microwave's success over the years is planning and observing every avenue possible. National HVAC has helped K&L Microwave accomplish every task from minor PM service to major specialty machine repair. National HVAC has been very resourceful for K&L Microwave with special plumbing tasks and electrical upgrades for process improvements throughout our company. National HVAC always shows up on time in a professional manner and accomplishes all tasks. In a world that is changing every day, National HVAC Service is my go-to for HVAC, plumbing, and electrical solutions. From one group of professionals to another Thank you National HVAC.
In my over 30 years at WMDT, National HVAC Service has been a trusted resource and have completed many projects with us. These projects have included all their trades such as Electrical, HVAC, and Plumbing. They were instrumental in our FCC channel repack, and have always been available and quickly responded to all our emergencies as well.
Awesome service focused company. Everyone we have dealt with is polite and very knowledgeable in the services they have provided our company over many, many years. I would recommend National HVAC Service to anyone. Great people! Great partners!
DELMARVA · 24/7 EMERGENCY SERVICE
Ready when you are — around the clock.
Commercial or residential, Seaford and across the Delmarva region. Call our 24-hour service line or request service online.