Residential HVAC Service in Maryland and Delaware


With a large team of highly skilled, expertly trained HVAC technicians and mechanics throughout southern Maryland and Delaware, National HVAC Service guarantees fast response time.

We provide 24/7/365 emergency care and complete maintenance plans to keep your system running at peak efficiency and performance.

For residential service in southern Maryland and Delaware please call our Seaford, DE, location at:

(302) 629-9400

Residential HVAC Maintenance Plans


These are the values behind National HVAC Service’s comprehensive Maintenance Plans. Benefits of a National HVAC Service Maintenance care plan include:

Peace of Mind

Don’t leave your home to just anyone. Trust the top-notch professionals at National HVAC Service. We will treat your home and family with the utmost respect and care.

Priority Service

As a maintenance plan customer, when you need service, you take top priority.

Scheduled Care

Let us worry about when it is time to maintain your system. You have enough to think about. We keep track of when your next maintenance is due and will contact you at the appropriate time to schedule it.

Overall Lower Costs

  • Your equipment will last longer due to regularly scheduled maintenance.

  • When eventually a repair is needed, you will receive a discounted labor rate in accordance with your maintenance plan.

  • Faster diagnosis and repair will normally result as we will be familiar with your system.

Residential HVAC Replacements & Upgrades

The United States Department of Energy has determined that up to 50% of the energy consumed in most homes is used for heating and cooling. This highlights the importance of having properly designed and installed heating and air conditioning systems, which can significantly reduce energy usage and costs.

Plus, upgrading your home's heating and cooling systems will provide many years of quiet and reliable comfort. To help meet your needs for comfort and energy efficiency, National HVAC Service provides:

  • Assistance in selecting an energy-efficient heating and air conditioning system that matches your comfort preferences and lifestyle

  • Proper sizing of the equipment for your unique situation

  • Installations supervised by your Comfort Specialist and performed by our licensed technicians

  • Full factory warranties on all equipment and labor

  • Superior customer service before, during and after your installation

  • 24-hour service