Ductwork Installation & Repair for Long Island Homes
Custom ductwork design, installation, repair, and sealing. Improve airflow, eliminate hot and cold spots, and reduce energy waste in your Nassau or Suffolk County home.
Professional Ductwork Services for Nassau & Suffolk County
Your ductwork is the distribution system that delivers conditioned air from your HVAC equipment to every room in your home. Even the most efficient furnace or air conditioner cannot perform properly if the ductwork is leaky, undersized, poorly routed, or deteriorating. At Island Comfort HVAC, we design, install, repair, and seal ductwork for homes across Long Island.
Leaky ductwork is one of the most common HVAC problems we find in Long Island homes, especially in houses built before 1990. Studies by the Department of Energy show that the average home loses 20% to 30% of conditioned air through duct leaks, disconnected joints, and poor insulation. That means up to 30% of your heating and cooling energy is being wasted in attics, crawl spaces, and walls where it does no good.
We offer several ductwork services to address these issues. Duct sealing uses mastic sealant and metal tape (not duct tape, which fails within a few years) to seal leaks at joints, connections, and boot fittings. A proper duct sealing job can improve HVAC system efficiency by 20% or more and often eliminates rooms that never seem to reach the right temperature.
For homes that need new ductwork, whether for a first-time central air installation or a replacement of deteriorated existing ducts, we design custom duct systems using Manual D calculations. This engineering approach sizes each duct run based on the airflow requirements of each room, the distance from the air handler, and the number of bends in the run. Properly designed ductwork delivers balanced airflow throughout the house, eliminates hot and cold spots, and operates quietly.
Long Island’s housing stock presents unique ductwork challenges. Cape Cods with limited attic headroom, split-levels with multiple floor elevations, and colonials with closed-wall construction all require creative duct routing. Our crew has decades of experience designing solutions that work within these constraints without sacrificing living space or architectural character.
We also offer duct insulation for ductwork running through unconditioned spaces like attics and crawl spaces. Uninsulated ducts in a 140-degree summer attic can raise the temperature of your cooled air by 15 to 20 degrees before it reaches your rooms. Proper R-8 insulation prevents this heat gain and keeps your conditioned air at the right temperature.
Ductwork Installation & Repair Features
Manual D Duct Design
Engineering-based duct sizing that ensures balanced airflow to every room. No guesswork.
Duct Sealing
Professional sealing with mastic and metal tape eliminates leaks that waste 20% to 30% of conditioned air.
New Ductwork Installation
Custom-fabricated sheet metal and flex duct systems designed for your home’s specific layout.
Duct Insulation
R-8 insulation for ducts in unconditioned spaces prevents heat gain in summer and heat loss in winter.
Airflow Balancing
We measure airflow at every register and adjust dampers to deliver the right amount of air to each room.
Historic Home Expertise
Creative duct routing solutions for Cape Cods, split-levels, and colonials without sacrificing living space.
Our Ductwork Process
Inspection & Assessment
We inspect your existing ductwork for leaks, damage, insulation condition, and sizing issues. We test airflow at every register.
Design & Proposal
Based on the assessment, we design a solution: sealing, repair, partial replacement, or complete new installation.
Professional Installation
Our crew installs using sheet metal trunk lines and insulated flex duct branches, secured and sealed at every connection.
Airflow Testing
We measure airflow volume at every register using an anemometer to verify balanced distribution throughout the house.
Final Walkthrough
We walk you through the completed work, show you any access panels we installed, and explain ongoing maintenance.
Same crew, start to finish.
No subcontractors. The team that starts your project is the team that finishes it.
Ductwork Pricing on Long Island
Ductwork services on Long Island range from $1,500 to $5,000 depending on the scope. Duct sealing for an existing system typically costs $1,500 to $2,500. Partial duct replacement or modification runs $2,000 to $3,500. Complete new ductwork installation for a home without existing ducts costs $3,500 to $5,000 or more depending on home size and complexity.
We provide a detailed written proposal after our assessment so you know exactly what the project includes and costs. Ductwork is often done in conjunction with a new HVAC system installation, and we offer package pricing when both are done together.
The ROI on ductwork sealing is among the best in home improvement. A $2,000 duct sealing job can reduce heating and cooling costs by 20% or more, paying for itself in 3 to 5 years.
What Long Island Homeowners Say
“James came out the same day we called. Diagnosed the issue in 20 minutes, had our AC back running within the hour. His crew installed our whole system four years ago and it has been flawless. Cannot recommend enough.”
“We got four quotes for central air. Island Comfort was the only company that showed up on time, explained every option without pressure, and gave us a written quote the same visit. System runs perfectly. Fair price.”
“Our furnace died on the coldest night in January. James had a tech at our house by 9 PM and we had heat back by midnight. They did not gouge us on the emergency call either. Ended up replacing the whole furnace the following week. Professional start to finish.”
Common Ductwork Services Questions
How do I know if my ductwork is leaking?
How long does ductwork last?
Can you install ductwork in a home that has never had central air?
Is duct cleaning the same as duct sealing?
Will new ductwork be noisy?
Other Services You May Need
Ready to Schedule Your Ductwork Services?
Free estimates. Honest pricing. Mon–Sat, 7 am to 7 pm.