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Your Comfort Is Our #1 Priority Call Today!

704-872-2431

Your Comfort Is Our

#1 Priority.

Since 1931 Duncan Heating & Air Conditioning has been delivering quality AC & Heating services in Statesville, NC and surrounding areas. Let's get you comfortable today with 24/7 HVAC Service & Replacement.

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Your all in one HVAC Contractor.

At Duncan Heating & Air Conditioning Inc., we firmly believe that no job, regardless of its scale, is beyond our capability or unworthy of our attention. With our unwavering commitment to excellence, we have established ourselves as a trusted name in the heating and air conditioning industry. Whether it's a large-scale commercial project or a minor residential repair, our team of highly skilled professionals is equipped with the knowledge and expertise to handle any task that comes our way. ï»¿

Proudly serving the Statesville, NC and Mooresville, NC areas. Click the button below to discover more about our HVAC services.

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Quality installs that reduce your energy bill and increase your comfort.

Service

No job is too small for our team. We can handle any HVAC related job you have.

Maintenance

Let us maintain your HVAC system and protect your investment.

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Commercial

Commercial HVAC experts that get the job done right.

Super service delivered to our customers

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Our Popular Spring HVAC services

Here are some of our popular Spring services. Learn more below.

Stay Cool & Save Money This Summer!

Spring is the perfect time to schedule an AC tune-up before the summer heat kicks in. Regular maintenance ensures your system runs efficiently, preventing breakdowns when you need cooling the most. A professional tune-up includes cleaning condenser coils, checking refrigerant levels, replacing filters, lubricating moving parts, and testing your thermostat. These small adjustments can significantly improve your system’s performance, extend its lifespan, and lower energy bills.

Fight Spring Allergies with Better Indoor Air Quality

As allergy season arrives, improving your indoor air quality is essential for a healthier home. HVAC upgrades like air purifiers, UV light systems, and high-efficiency air filters can help remove airborne allergens, bacteria, and viruses. Spring is also a great time to check humidity levels—adding a dehumidifier can prevent mold growth and keep your home feeling fresh. Simple steps like replacing air filters regularly can also make a big difference in breathing cleaner air.


Interested in how Duncan can help you fight allergy season? Call us today!

Is Your AC Ready for Summer? Check Your Refrigerant Levels Now!

Low refrigerant levels can cause your AC to struggle, leading to inefficient cooling and higher energy bills. A professional technician can check your system’s refrigerant levels, inspect for leaks, and recharge it if needed. Addressing these issues in the spring ensures your AC is ready to handle the heat without overworking itself, helping you stay comfortable all summer long.

Upgrade Your Comfort with a Smart Thermostat

Upgrading your thermostat in the spring can make a big difference in comfort and energy savings. A smart thermostat learns your schedule, automatically adjusting temperatures for efficiency while keeping your home comfortable. Even a simple recalibration of your existing thermostat ensures accurate temperature readings and prevents unnecessary energy use. With remote control options, you can adjust settings from anywhere, helping you stay cool without high utility bills.

A Higher Standard of Comfort.

Energy efficient equipment at an affordable price. Click below to learn more about our products and how they can improve your comfort.

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Leave Your HVAC Needs To The Pros At Duncan

Trust us to be your all in one HVAC contractor. We are eager to earn your business and improve your comfort.

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Common HVAC Questions

Here are some of the most frequently asked heating and air conditioning questions we receive from our customers. Click below to learn the answers to some of our most FAQs here at Duncan Heating & Air Conditioning:

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  • How often should I service my HVAC system?

    To keep your HVAC system running in tip-top shape, we recommend a maintenance appointment twice a year (once for heat, once for air conditioning). This way, an Oliver technician can check your filters, coils, wiring, housing, motor, and more to make sure you’re getting the most out of your system.

  • How do I know if I need a new HVAC system?

    If your HVAC system requires constant repairs, is 15 years or older, or can’t heat or cool your home properly, we recommend you replace it. When an HVAC system ages, it doesn’t operate as efficiently and could actually end up costing you more money than it should.

  • When should I replace air filters?

    The air filters are one of the most important components of an HVAC. They catch all the airborne particles that you don’t want floating around your home and in your lungs. Once they become full or clogged, your indoor air quality becomes compromised and the lack of airflow can lead to system breakdowns. It is best to replace your air filters about every three months and more often if you live with a smoker or someone with allergies or asthma.

  • What size HVAC unit is right for my home?

    HVACs are not one-size-fits-all. If your unit is too big for the home, it will pump out more air than needed, causing higher bills and an increase in condensation which can lead to mold and algae growth. If the unit is too small, it will become overworked and your home will see uneven temperatures. Your HVAC professionals will help you determine the correct size unit for your home as you begin the process of a new installation.

  • What is a heat pump?

    A heat pump is a part of the heating and cooling system which is installed outdoors and pulls in air to heat or cool your home. They are more eco-friendly than a furnace as they do not burn fossil fuels, require minimal maintenance, are long lasting, and can both heat and cool your home.

  • Why are maintenance appointments important?

    We wouldn’t say maintenance appointments are important. We’d say they are ESSENTIAL! By scheduling these visits from your technician, you’re setting your HVAC up for a successful season of heating or cooling. The technician will clean your unit and replace your air filter, improving your indoor air quality. They will also be able to spot the warning signs of a potential future breakdown and solve them before they cost you down the road.

  • What is HVAC?

    HVAC, which stands for Heating, Ventilation, and Air Conditioning, is an all-encompassing term when it comes to talking about your heating and cooling system in its entirety. While the world of HVAC might seem complicated, it doesn’t have to be confusing for homeowners. Give the Duncan Heating & Air Conditioning team a call for any HVAC service needs you may have!


  • What is the purpose of an HVAC system?

    An HVAC system serves various purposes in your home including maintaining a comfortable indoor environment, preventing moisture and mold growth, eliminating allergens and pollutants, providing fresh air ventilation, and more! 

Two Locations. One Great Company.

With two office locations in Statesville, NC and Mooresville, NC our goal is to ensure that we have Iredell County and surrounding areas covered FAST when it comes to your HVAC service. Having two locations allows us to get to your home or office faster with local technicians in place at both our Statesville, NC headquarters and our new Mooresville, NC office. Call today for any heating and air conditioning service you may need, we will get there FAST!

Statesville, NC

Statesville, NC

Mooresville, NC

Mooresville, NC

Our Blog

Learn more about our tips and services with the Duncan Heating & Air Conditioning blog.

February 20, 2025
When it comes to keeping your Statesville home warm and comfortable during the colder months, choosing the right heating system is essential. At Duncan Heating & Air Conditioning, we understand that every home and family has unique needs. Let’s break down the differences between gas and electric heat to help you make the best choice for your comfort and budget. Efficiency and Operating Costs One of the biggest considerations when choosing between gas and electric heat is the cost of operation. Natural gas tends to be more cost-effective than electricity, especially during the winter months when heating demands are high. Gas furnaces typically heat a home faster and more efficiently than electric systems, which can mean lower energy bills in the long run. However, electric heating systems have their own advantages. They are generally less expensive to install and require less maintenance over time. Plus, with the mild winters we often experience in Statesville, an electric heat pump might provide ample warmth without breaking the bank. Environmental Impact If reducing your carbon footprint is a priority, electric heat might be the greener option. Electric systems, especially when paired with renewable energy sources like solar panels, produce no direct emissions. On the other hand, natural gas combustion does release carbon dioxide, though modern gas furnaces are designed to be highly efficient and environmentally conscious. Reliability and Comfort When it comes to reliability, gas heat often has the upper hand. Gas furnaces can operate during power outages, ensuring your family stays warm even when the grid goes down. Electric systems, while reliable, are entirely dependent on a steady power supply. That said, electric heat pumps offer both heating and cooling, making them a versatile choice for year-round comfort in the Statesville climate. They also provide more consistent, even heating compared to the cycles of a gas furnace. Making the Right Choice Ultimately, the best heating system for your home depends on your priorities. If you value lower operating costs and fast, reliable heat, a gas furnace may be the way to go. If you prefer a cleaner energy source with less maintenance and year-round versatility, an electric heat pump could be your ideal solution. At Duncan Heating & Air Conditioning, we’re here to help you weigh the pros and cons and find the perfect fit for your Statesville home. Contact us today to schedule a consultation and take the first step toward a warmer, more efficient home this winter! To learn more about some of the energy efficient heating and air conditioning products we carry and install, check out our products page !
January 29, 2025
Living in Statesville, NC, means experiencing unpredictable weather patterns, especially as the seasons change. One day, it might be warm and sunny, and the next, temperatures could drop dramatically. These sudden temperature swings can take a toll on your HVAC system and your comfort. Here are some practical tips to ensure your home is prepared for these rapid weather changes. 1. Schedule Regular HVAC Maintenance Your heating and cooling system works hardest when temperatures fluctuate drastically. Scheduling routine maintenance with Duncan Heating & Air Conditioning Inc. ensures your system is in peak condition. Our technicians will check for potential issues, clean essential components, and make necessary adjustments to keep your HVAC system running efficiently. 2. Check and Replace Air Filters Frequent temperature shifts mean your HVAC system is constantly adjusting. A dirty or clogged air filter can reduce airflow and efficiency, making it harder for your system to keep up. Check your air filters monthly and replace them as needed to maintain good indoor air quality and system performance. 3. Upgrade to a Smart Thermostat A smart thermostat can automatically adjust your home's temperature based on the weather and your schedule. This not only helps maintain a consistent indoor climate but also improves energy efficiency by reducing unnecessary heating or cooling. Check out our thermostat product page to learn more about our smart, energy efficient thermostats! 4. Seal Leaks and Insulate Your Home Sudden temperature changes can expose weaknesses in your home's insulation and air sealing. Check for drafts around doors, windows, and attic spaces. Proper insulation and weather-stripping can help stabilize indoor temperatures, reducing the strain on your HVAC system. 5. Utilize Ceiling Fans and Window Treatments Ceiling fans can help distribute warm or cool air more evenly throughout your home. During colder days, switch your ceiling fan to rotate clockwise to push warm air down. In the summer, use window blinds or curtains to block excess heat from the sun. 6. Prepare for Emergency Situations If a cold snap or heatwave hits unexpectedly, have backup heating and cooling options available. Space heaters, extra blankets, or portable fans can help maintain comfort until your HVAC system catches up. Also, make sure your system’s emergency settings are properly configured. 7. Monitor Your System for Warning Signs Pay attention to any unusual sounds, inconsistent airflow, or sudden spikes in energy bills. These can be signs that your HVAC system is struggling to keep up with temperature swings. Addressing issues early can prevent costly breakdowns. Stay Comfortable Year-Round with Duncan Heating & Air Conditioning Inc. Preparing for sudden temperature swings ensures that your home remains comfortable no matter what the weather brings. At Duncan Heating & Air Conditioning Inc., we’re here to help you maintain an efficient and reliable HVAC system. Contact us today to schedule a maintenance check or upgrade your home’s heating and cooling solutions!
December 31, 2024
Winter in Statesville, NC, means cozy nights and chilly mornings, and your furnace is the key to keeping your home warm and comfortable. But how do you know if your furnace needs a tune-up? Ignoring maintenance can lead to costly repairs or even a breakdown during the coldest months. At Duncan Heating & Air Conditioning, we’ve compiled a list of five common signs that it’s time to schedule a furnace tune-up. 1. Uneven Heating Throughout Your Home Are some rooms in your home much colder than others? Uneven heating often points to a furnace struggling to distribute warm air evenly. This can be due to clogged filters, ductwork issues, or a malfunctioning blower. A professional tune-up can identify and resolve the issue, restoring consistent warmth to every corner of your home. 2. Unusual Noises A properly functioning furnace should operate quietly. If you notice banging, squealing, rattling, or other strange noises, it’s a clear sign something is wrong. These sounds could indicate anything from loose components to worn-out belts or even a cracked heat exchanger. Don’t ignore these noises—schedule a tune-up to prevent further damage. 3. Rising Energy Bills If your energy bills have increased without a change in your usage, your furnace could be the culprit. An inefficient system works harder to heat your home, using more energy in the process. A tune-up can improve your furnace’s efficiency, saving you money in the long run. 4. Frequent Cycling Does your furnace turn on and off more often than usual? This frequent cycling can be a sign of a problem with the thermostat, dirty filters, or an issue within the furnace itself. Regular maintenance can help identify the cause and ensure your system runs smoothly. 5. A Yellow or Flickering Pilot Light The pilot light on a gas furnace should burn a steady blue flame. If it’s yellow or flickering, it could indicate an issue with the gas supply or the presence of carbon monoxide. This is not only a sign of a needed tune-up but also a potential safety hazard. Address this immediately by contacting a professional. Why Schedule a Furnace Tune-Up? A tune-up ensures your furnace operates efficiently and safely, prolongs its lifespan, and helps prevent unexpected breakdowns during the winter months. At Duncan Heating & Air Conditioning, our experienced technicians provide thorough inspections, cleaning, and adjustments to keep your furnace in peak condition. Trust Duncan Heating & Air Conditioning for Your Furnace Tune-Up Don’t let a neglected furnace disrupt your winter comfort. If you’ve noticed any of these signs, it’s time to schedule a tune-up with Duncan Heating & Air Conditioning. We’re proud to serve the Statesville, NC, community with reliable HVAC services tailored to your needs. Contact us today to schedule your furnace tune-up and stay warm all winter long! For more HVAC tips and expert advice, explore our blog or call us at 704-872-2431 .
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