Frequently Asked Questions

Yes — and it pays for itself. Your heating, ventilation, and air conditioning system is what keeps your home or building comfortable year-round. Regular maintenance keeps that equipment running efficiently, extends its service life, and reduces costly downtime. Call 302-629-9400 to ask about our Home Comfort Plans and commercial PM Agreements.

National has been in business for over 60 years, taking pride in delivering quality products at reasonable rates. Our systems are installed by professionals who have one goal: do the job right the first time so our customers stay satisfied — and stay comfortable. Ready to get started? Call 302-629-9400.

High electric bills are usually a good sign your system is getting old and inefficient. Systems 10 years or older may also use R22, a refrigerant that is no longer produced — which can make repairs significantly more expensive. Current systems from National HVAC carry a 10-year parts warranty, use environmentally friendly refrigerants, and are far more energy-efficient. If you're unsure, call us at 302-629-9400 for an honest assessment.

We can install any name-brand system you prefer. We recommend and install American Standard Heating and Cooling systems — we have great confidence in their quality and dependability, and so will you. American Standard is #1 in customer satisfaction. Call 302-629-9400 to discuss the right system for your home or facility.

Yes. We offer Wells Fargo financing for qualified buyers with up to 60 months no-interest financing, plus manufacturer rebate programs. Ask about your options when you call 302-629-9400.

Yes. We have both commercial and residential plumbing service plans that help identify and prevent problems in your home or facility's plumbing system, regardless of size. Call 302-629-9400 to learn what's included.

Very important. We provide air filtration systems certified as asthma- and allergy-friendly, and we install ionization units proven up to 99% effective against airborne pathogens — including COVID viruses. IAQ solutions can make a meaningful difference in the comfort and health of your indoor environment. Call 302-629-9400 to find out which solution fits your space.