At J.C.'s Heating & Air, we don't just install HVAC systems—we build the parts that make them work better. With our in-house custom metalwork fabrication services in Knoxville, TN, we create tailored ductwork, transitions, fittings, and enclosures that ensure a perfect fit, better airflow, and long-lasting system performance.
Every home is different. That's why off-the-shelf parts don't always cut it—especially in older houses, modular homes, tight spaces, or unique layouts. Our fabrication capabilities allow us to create custom sheet metal components for heating, cooling, ventilation, and air quality systems with unmatched precision and quality.
If you're looking for a local HVAC contractor who can design, build, and install custom ductwork or specialty fittings in-house, trust the team with over 35 years of hands-on experience in East Tennessee. We serve homeowners and businesses throughout Knoxville, Maryville, Clinton, Oak Ridge, Farragut, and Lenoir City with high-quality, code-compliant metalwork that performs—and lasts.
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HVAC systems rely on more than just furnaces, coils, and compressors. Every part of the system—especially duct transitions, plenums, and fittings—must be properly sized, shaped, and sealed to move air efficiently.
When those components aren't a perfect fit, you may end up with:
Poorly fitted components can lead to air leakage, reducing efficiency and increasing energy costs.
Improper ductwork can restrict airflow to certain rooms, creating comfort issues throughout your home.
Without proper metalwork, temperature distribution can be inconsistent from room to room.
Poorly designed ductwork forces your HVAC system to work harder, potentially shortening its lifespan.
Inefficient airflow leads to increased energy consumption and higher monthly costs.
Improper fittings can cause noisy air movement or rattling throughout your duct system.
With our custom fabrication capabilities, we eliminate these problems by designing sheet metal solutions specifically for your home and your system, not just what's available on the shelf.
Request Custom MetalworkWe have a full-service sheet metal shop that allows us to fabricate a wide range of HVAC system components, including:
All components are built to precise measurements, using high-quality galvanized steel, and finished with professional sealing and support methods to ensure long-term performance.
Every installation has its own challenges—tight attic spaces, uneven crawl spaces, unique architectural layouts, or old equipment that doesn't match modern dimensions. Our custom metal shop allows us to overcome these challenges without delay.
Whether you're replacing a decades-old system or installing equipment in a newly built home, our custom metalwork ensures that every part fits properly and performs efficiently.
Unlike HVAC companies that outsource their sheet metal needs, J.C.'s Heating & Air handles everything under one roof. That gives you:
No waiting on third-party parts or delays—we control the production schedule.
Exact measurements for your home and HVAC specifications ensure perfect alignment.
Fewer leaks and better static pressure balance for optimal system performance.
Seamless integration into your home with professional-looking installations.
Built to last with the right gauge steel for each application and environment.
We own the process, so quality is guaranteed from design to installation.
This level of control allows us to deliver superior HVAC system performance, especially for projects where precision is critical.
We follow a proven process that ensures every part we build supports your system's function, longevity, and efficiency.
Our technicians take precise on-site measurements to ensure accuracy for every component.
We plan the duct or fitting layout to ensure it supports airflow and static pressure balance.
Our shop team cuts, forms, and assembles sheet metal to match the required specifications.
Our HVAC crew installs the metalwork with proper bracing, sealing, and alignment for optimal performance.
We test the airflow, check for leaks, and confirm that everything is functioning as intended before completion.
Whether it's a simple plenum or a full system of custom duct runs, we ensure that every component is engineered for efficiency and built to last.
Many homes in the Knoxville area were built decades ago—and their duct systems weren't designed for today's HVAC equipment. If you're replacing a furnace or AC unit and the ductwork doesn't match up, custom transitions or plenums may be necessary.
We specialize in upgrading and adapting these systems with:
We design and build return air systems that match your home's layout and needs.
We fabricate properly sized supply trunks for optimal airflow distribution.
We adjust duct dimensions to ensure proper airflow for modern equipment.
We create custom plenums that connect new equipment to existing ductwork.
This approach ensures your new HVAC equipment works as efficiently and quietly as it should, without the performance issues that come with a poorly matched system.
Mobile and modular homes often require specialized fittings and smaller duct sizes. Our shop fabricates metalwork that fits these unique systems perfectly, including:
Custom-built to fit the limited space in manufactured housing.
Designed for tight turns in confined spaces without restricting airflow.
Space-saving designs that maintain proper airflow distribution.
Specially fabricated to match manufactured housing equipment.
We install equipment that's specifically rated for manufactured housing—and we build the fittings that make it work at peak performance.
In addition to residential work, J.C.'s Heating & Air provides custom sheet metal solutions for light commercial HVAC applications, including:
We work with building owners, contractors, and property managers to deliver fast, code-compliant results for commercial applications across East Tennessee.
With so many HVAC companies in Knoxville, why do homeowners and businesses continue to trust J.C.'s Heating & Air?
Backed by a team of certified and highly skilled technicians, we’ve served Knoxville and the surrounding areas since 2001 with more than 35 years of experience behind us.
We install and service Armstrong, Ducane, Daikin, and American Standard systems. Our services include custom metal fabrication, duct cleaning, and indoor air quality solutions.
We are an A+ BBB Accredited business and a Daikin Elite Dealer. Our work is backed by a customer satisfaction guarantee.
We always provide honest, upfront pricing with no hidden fees. We also have same-day and emergency service availability so you never have to worry about an unexpected outage.
Contact us today to schedule your heating and air conditioning service in Knoxville, TN.
Prevent costly repairs and ensure your heating and cooling system runs efficiently year-round with our residential HVAC maintenance plans. At J.C.'s Heating & Air, we offer comprehensive tune-ups and seasonal check-ups designed to extend the lifespan of your HVAC system while lowering energy bills. Benefits of our maintenance plan include:
Our maintenance plan members enjoy priority scheduling for repairs and service calls.
We perform regular system inspections to catch issues before they turn into costly repairs.
Routine maintenance improves efficiency for lower energy bills and reduced wear and tear.
We offer discounted repairs and service rates for maintenance plan members.
Sign up for a J.C.'s Heating & Air maintenance plan today and enjoy peace of mind knowing your HVAC system is always running at peak performance.
Find Your Maintenance PlanJ.C.'s Heating & Air proudly serves Knoxville and surrounding areas, including:
If you’re looking for professional HVAC services in Knoxville, TN, and beyond, our team is ready to help.
At J.C.'s Heating & Air, we understand that homeowners and businesses have many questions about custom metalwork fabrication. Below, we've compiled some of the most frequently asked questions about sheet metal HVAC work to help you make informed decisions.
Standard, pre-manufactured fittings often don't match perfectly with your home's layout or your HVAC system's requirements. Custom metalwork ensures all parts are properly sized and shaped, resulting in tighter seals, better airflow, quieter performance, and a more efficient system overall. It's especially important in older homes, tight spaces, and unique installations.
We fabricate a wide range of HVAC system components, including:
If it's part of your air distribution system, we can build it.
In many cases, yes—especially in older homes or mobile/modular units. Newer HVAC equipment may not line up with existing ducts, or your current duct system may not be sized properly. Custom sheet metal allows us to create exact-fit transitions and connections for a seamless, high-performance installation.
We primarily use galvanized steel for its strength, durability, and corrosion resistance. It's ideal for HVAC applications because it withstands airflow pressure, temperature changes, and humidity without warping or rusting. We also use aluminum or stainless steel when specific projects require it.
Yes. All metalwork is professionally sealed at the seams to prevent air leakage. If insulation is needed—such as in unconditioned spaces or for noise control—we apply external insulation wraps or line ducts as needed per code and comfort standards.
For most residential projects, we can fabricate the necessary fittings or ductwork within a day or two of taking measurements. Because we fabricate in-house, we avoid the delays that come with outsourcing, so you get faster installations and fewer scheduling issues.
Absolutely. Mobile and modular homes often require non-standard duct sizes, low-clearance fittings, or compact transitions. We specialize in designing and fabricating components specifically for manufactured housing systems and space-constrained environments.
When your ductwork is built to match your system, everything works better—from airflow to energy efficiency.
Yes. We provide custom sheet metal services for light commercial HVAC systems, including:
We work with business owners, contractors, and property managers across the Knoxville area to deliver durable, code-compliant results.
We provide custom sheet metal fabrication services in:
No matter the project, J.C.'s Heating & Air delivers precision-crafted metalwork built to support better comfort and system performance.
If you're installing a new HVAC system, upgrading old ductwork, or dealing with airflow problems caused by poorly fitted components, custom sheet metal fabrication could be the key to better performance. At J.C.'s Heating & Air, we provide in-house metalwork fabrication in Knoxville, TN, creating high-quality duct fittings, transitions, plenums, and more—designed specifically for your system.
With over 35 years of experience, we know that HVAC efficiency, airflow, and longevity all depend on properly built and installed ductwork. That's why we don't rely on generic parts. Our team takes precise measurements on-site and fabricates components that match your system's needs exactly—no gaps, no mismatches, and no unnecessary restrictions. The result is a quieter, more reliable, and more efficient HVAC system that delivers comfort to every room.
We offer custom metalwork solutions for:
Whether you're working with limited space, replacing outdated components, or managing a new system installation, we'll fabricate exactly what you need—right in our own shop and delivered on your timeline.
We build with durable galvanized steel, seal every joint for optimal airflow, and install everything with code-compliant practices and long-term performance in mind. Our work is trusted throughout Knoxville, Maryville, Oak Ridge, Clinton, Farragut, and Lenoir City for its precision and reliability.
Need help financing your HVAC upgrade? We offer flexible payment plans through Synchrony and Service Finance, with:
Want to keep your custom system in top shape long after install day? Ask about our residential maintenance plans, which include seasonal tune-ups, priority service, and special discounts—all designed to help you protect your investment.
At J.C.'s Heating & Air, we take pride in being more than just installers—we're builders, craftsmen, and system designers who ensure every HVAC component supports lasting comfort. From the air handler to the last register, we'll make sure everything fits, flows, and performs the way it should.
Call J.C.'s Heating & Air today or request your consultation online to learn more about our custom HVAC metalwork in Knoxville. Let's get started—and build something that works better for your home or business.
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