24 Hour Service 302-629-9400

Customer 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.

Dave Frontera - Facility Manager

K&L Microwave

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.

William Hoctor - Chief Engineer


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!

Dan Welch - CEO

Johnny Janosik Inc.

National has maintained our HVAC equipment for the past 14 years. We have 52 units and their response and service has always been excellent. They listen well, keep me involved with the repair status and are a pleasure to work with

Ken Boyer

Crossroads Community Church

Best HVAC team in the Delaware area! Professional, great communicators and talented team! I use them for Commercial projects and my home.

Leanne Silicato Prosser

Very quick service response and very nice/good gentleman that came to do the service. Would highly recommend National HVAC Service!

Elsie Gilmore

Quick response and solution to a broken air conditioner on the hottest day of the year and it was after hours! The tech was very knowledgeable and worked fast to get our house cooled down. Will recommend to all our neighbors.

Jon Wilson

National HVAC is a dependable and honest group of service reps.

Armand Ferraro

Just got routine maintenance check ups winter and summer! They were very professional and the guy wore a mask and in and out!

Lynn Alexander

I have always received good service from the Seaford Delaware National HVAC Company. I get a yearly maintenance contract from them.

William Fleetwood

I highly recommend National HVAC Service, I've been a customer for 17 years working in the home care company for many years with the elderly if I went in their homes and found out it was hot and their units weren't working I would call them immediately and they would be out within the hour, yesterday evening I called the companies answering service because my daughter with her two young children under five we're home and the AC stopped working, called me back immediately And we're out within the hour and fixed the unit I can't say enough about this company. I dealt with many companies through the years I never found one so honest and dependable.

Cheryl Jankowski

Rehoboth Beach

Danny Davis, their Residential Service Supervisor, just left my home after a VERY comprehensive - 3 hour - Annual Maintenance Service appointment, my first as a new customer .... and will be for life. He serviced three systems ... a Heat Pump and two Gas Furnace systems. I was with him the entire time - including over an hour in my crawl space - to become more knowledgeable, ask questions, and be impressed. Danny completely disassembled my crawl space gas furnace burners to make sure they were not damaged. And tested every safety switch on all systems. Danny is extremely thorough, professional, personable, and experienced. Five Star!
So glad I found National HVAC, Danny, ?Peter Palverento - their Residential Operations Planner, Richard Clark - their Residential Sales Manager, and the whole gang. Finally found an HVAC company you can trust, and to maintain your HVAC equipment. Again, Five Star.

William Pfordt

Seaford, DE

We have had several plumbing leaks recently that required emergency service. Bruce Willoughby dispatched Jake and Fred who were here quickly and had quite a bit of pipe replaced in a more than reasonable timeframe. Thanks again to Bruce, Jake and Fred.

Scott Jett - Site Manager

Braemar Towers - Ocean City MD


My new HVAC system is up and running, and I want you to know that I have been very impressed by your employees.

JoQuan has worked diligently and effectively, and done everything possible to get the job done correctly, and in a timely fashion. He has been a pleasure from start to finish.

Jake was knowledgeable, productive, and very pleasant.

Ethan was thorough and helpful in every way. He took every issue seriously, he checked with me frequently to assure that he was "on the same page" with me about routing paths, etc., and he did all that he could to make sure I was pleased with the installation.

All three of these guys are top-notch workers!

Dwight Blakeney

Seaford, DE.

Very pleased with the thorough job Jaime did when he serviced my heater. He always answers my questions in a manner I can understand.

Sherryl Hartman

10108 Benson Rd Lincoln, DE19960

As the Property Manager of Savannah West and Mills Landing Apartments, I would like to take this time commend the Service Tech (Jamie). He has always been professional, efficient and fully communicates any issues or concerns, he provides options for repairs or replacements. I can depend on the quality of his service to be completed in a timely manner with excellent results. I would recommend using National every time.

Savannah West and Mills Landing Apartments

Lewes, De

I wrote a previous Review after my first appointment with National and Danny Davis (Residential Service Supervisor) several years ago. Have been a customer for HVAC, Plumbing and Electrical needs ever since.
Today I was fortunate to have Danny come back again for an HVAC problem actually caused by me. As I said previously, "Danny is extremely thorough, professional, personable, and experienced. Five Star!" And he takes the time necessary to answer all the homeowner's questions, and makes great recommendations.
Great employees in the Field and the Corporate Office! Great company!

William Pfordt


Patrick M., Master Plumber with National HVAC, replaced my Crawl Space Sump Pump today under difficult and uncomfortable to say the least conditions, as it was flooded, cold, and hard to work in the area. I assisted him for the time he was at my home, so I can testify how difficult, wet, and cold it was. Bruce W., the Plumbing Manager at National, had Patrick at my home within half an hour after my emergency call and conversation. And Kelli M, Residential Service Coordinator, made all the connections to make it happen. I have been a National HVAC customer for several years, and I have had HVAC, Plumbing and Electrical work done on my home always by a competent, professional and personable Service Tech. Awesome Company!

William Pfordt


Jake M. is awesome! He is professional, personable, knowledgeable and very thorough.
He replaced my NEW 56 days OLD Sump Pump that failed and flooded my crawl space with a new one. It was wet, difficult and uncomfortable in cold conditions, not to mention in a hard to work area. I assisted him for the time he was at my home, so I can testify how difficult, wet, and cold it was.
Jake is a true asset to National HVAC; a FIVE Star plumber!!!!!

William Pfordt


I have had other companies service my a/c equipment in the past.
Services are now provided by National HVAC. Drew Wilson serviced my units this year /
I must tell you he did an excellent job, very thorough.

Alvin French

512 Kings Hwy Milford,DE