Duct Sealing Services in Raleigh, NC
Stop Energy Waste, Improve Comfort
Professional Duct Sealing Services
Leaky ductwork is one of the biggest energy wasters in most homes. The average home loses 20-30% of its conditioned air through duct leaks, that means you are paying to heat and cool your attic, crawl space, and walls instead of your living spaces.
Icy Hot provides professional duct sealing services that can reduce energy waste by up to 30%, improve comfort in every room, and enhance your indoor air quality by preventing dust, insulation fibers, and pollutants from being pulled into your ductwork.
Not sure whether your system needs sealing or cleaning? They are different jobs with very different evidence behind them, and we lay out the federal guidance in our guide to whether duct cleaning is worth it.
Signs Your Ducts Need Sealing
- Some rooms are always too hot or too cold
- High energy bills despite a well-maintained system
- Excessive dust in your home
- Visible gaps or disconnections at duct joints
- Musty or dusty smell from vents
Our Duct Sealing Process
Leaky ducts waste 20-30% of your heating and cooling energy. Here is how we find and seal them:
- Visual Duct Inspection: We inspect all accessible ductwork in your attic, crawlspace, and basement, looking for disconnected joints, visible gaps, deteriorated tape, crushed flex duct, and missing insulation.
- Pressure Testing: We seal the registers and pressurize your duct system with a duct blaster to measure total air leakage. This gives us an objective number showing exactly how much conditioned air you are losing.
- Professional Sealing: We seal leaks at joints and connections using mastic sealant and UL-listed foil tape, not the cloth “duct tape” that deteriorates within a few years. We focus on the largest leaks first for the biggest energy savings.
- Verification Testing: After sealing, we re-pressurize the system and measure the improvement. Typical duct sealing reduces air leakage by 50-80%, which translates directly to lower energy bills and more even temperatures.
- Performance Report: You receive a before-and-after comparison showing exactly how much your duct leakage improved, along with estimated annual energy savings based on the reduction.
Frequently Asked Questions
How much energy do leaky ducts waste?
According to the EPA and ENERGY STAR, the typical home loses 20-30% of conditioned air through duct leaks, meaning up to a third of the air you are paying to heat or cool never reaches your living spaces. That translates to hundreds of dollars per year in wasted energy. Ducts running through unconditioned spaces like attics and crawlspaces are the worst offenders, because leaked air is completely lost to spaces you are not trying to condition. In Raleigh-area homes, attic temperatures can exceed 140 degrees F in summer, so even small duct leaks in the attic create enormous energy penalties as your system struggles to compensate.
How much does professional duct sealing cost?
Professional duct sealing typically costs $1,200-$3,000 for most homes, depending on the method used and the extent of leakage. Traditional mastic sealant and metal tape applied by hand at accessible joints is the most affordable approach at $800-$1,500. Aeroseal, a technology that seals ducts from the inside using aerosolized polymer particles, costs $1,500-$3,000 but can reach leaks in inaccessible areas that manual sealing cannot. The investment typically pays for itself within three to five years through energy savings. Additionally, duct sealing may qualify for tax incentives under the Inflation Reduction Act, covering up to 30% of the cost.
What is Aeroseal duct sealing and how does it work?
Aeroseal is a patented technology that seals ductwork from the inside out. A technician temporarily blocks all your supply and return registers, then pressurizes the duct system with aerosolized vinyl acetate polymer particles. These particles are carried by air pressure to leak points, where they accumulate and bond to seal gaps up to 5/8-inch wide. The system provides real-time computer monitoring showing exactly how much leakage existed before and after treatment. Aeroseal seals last up to 40 years with proper HVAC maintenance and can reduce duct leakage by up to 90%. It is particularly effective for ductwork in walls, ceilings, and other inaccessible locations.
What are the signs that my ducts are leaking?
Common indicators include rooms that are consistently too hot or too cold compared to the rest of the house, weak airflow from certain registers, excessive dust on furniture despite regular cleaning, and higher-than-expected energy bills. You may also notice the HVAC system running longer cycles without reaching thermostat set points. Visible signs include disconnected duct joints in accessible areas, duct tape that has dried out and peeled away, or dusty streaks around register boots in ceilings or floors. If your Raleigh home is more than 15 years old and the ductwork has never been sealed, there is a high probability of significant leakage. Call Icy Hot at (919) 673-7667 for a duct leakage assessment.
Does duct sealing improve indoor air quality?
Significantly. Leaky ducts in attics and crawlspaces create negative pressure zones that pull in unfiltered air containing dust, insulation fibers, mold spores, pest droppings, and other contaminants. This unfiltered air bypasses your HVAC filter entirely and goes straight into your living spaces. Sealing those leaks eliminates this pathway for pollutant infiltration. In Raleigh’s humid climate, duct leaks in crawlspaces can also draw in moisture-laden air that promotes mold growth inside the ductwork itself. After sealing, many homeowners notice a dramatic reduction in dust accumulation and an improvement in allergy symptoms.
How long does duct sealing last?
When performed properly, duct sealing is a long-term solution. Mastic sealant, the industry-preferred material, remains flexible and durable for the life of the ductwork, typically 20-30 years or more. Aeroseal treatments are warranted to last up to 40 years. By contrast, standard duct tape (despite its name) is not appropriate for duct sealing, as it dries out and fails within one to five years. Metal-backed tape (UL 181) performs better but still does not match mastic or Aeroseal longevity. Icy Hot Heating & Air Conditioning uses professional-grade mastic sealant and Aeroseal technology to ensure your duct sealing investment delivers decades of performance.
Will sealing my ducts reduce my energy bills?
Yes, homeowners typically see energy bill reductions of 20-30% after comprehensive duct sealing, which can translate to $200-$400 or more per year in savings depending on your home’s size and local energy rates. ENERGY STAR estimates that sealing and insulating ducts can save the average homeowner about $200-$400 annually. The savings are most dramatic in homes with ducts running through unconditioned attics or crawlspaces, where leaks force your HVAC system to work significantly harder. Combined with proper duct insulation, the payback period is usually three to five years, after which the savings go directly into your pocket.
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