Your AC system is only as good as the ducts delivering the air. Leaking, disconnected, or deteriorating ductwork wastes 20–30% of your cooled air and drives up your JEA bill every month. Cool & Cozy inspects, seals, repairs, and replaces ductwork across Jacksonville homes and commercial properties.
FL License CAC1819948 · Free Duct Inspections · All Duct Types · Se habla español
Cool & Cozy AC Repair provides ductwork inspection, repair, sealing, and replacement for homes, businesses, and managed properties throughout Jacksonville and Duval County. The duct system distributes cooled and heated air from your HVAC equipment to every room in your building — and when ducts leak, disconnect, collapse, or deteriorate, the result is wasted energy, uneven temperatures, excessive dust, and an AC system working significantly harder than it should. The U.S. Department of Energy estimates that typical duct systems lose 20 to 30 percent of air to leaks, holes, and poor connections. In Jacksonville's extreme summer heat, that loss translates directly to higher JEA electricity bills and rooms that never cool properly. Cool & Cozy is a Florida-licensed contractor (CAC1819948) serving residential and commercial duct systems. Call (904) 555-0199 for a free duct inspection.
Most homeowners don't realize their ducts are leaking — they just notice the symptoms. Here's how duct problems show up in Jacksonville homes.
If some rooms reach the thermostat's set temperature while others stay warm, the ductwork serving those rooms may be leaking, disconnected, or undersized. This is especially common in rooms at the end of long duct runs or rooms served by flexible duct that has been crushed or kinked.
When 20–30% of your cooled air leaks into the attic or crawlspace, your AC runs longer and harder to compensate. On a $200/month summer JEA bill, that's $40–$60/month you're paying to cool your attic instead of your living room.
Leaky return ducts pull unconditioned attic or crawlspace air — along with dust, insulation fibers, and allergens — into your living space. If you're dusting constantly and changing filters more than monthly, your ducts may be the source.
If you can see your ductwork in the attic or crawlspace and notice disconnected joints, crushed flex duct, sagging runs, torn insulation, or rodent chew marks, those are direct air leaks that need repair.
These sounds often indicate a partially blocked or kinked duct, a loose connection vibrating against framing, or sheet metal expanding and contracting from temperature changes.
In Jacksonville's humidity, condensation inside poorly insulated ducts creates conditions for mold and mildew growth. If turning on the AC produces a musty smell, the ductwork may need inspection and remediation.
If any of these sound familiar, call (904) 555-0199 for a free duct inspection. We'll find the problem and show you exactly what's happening.
Four service categories covering everything from quick leak fixes to complete duct system replacement.
We perform a visual and pressure-based inspection of your entire duct system. This includes accessing attic and crawlspace runs, checking every connection point, measuring airflow at each supply vent, and identifying leaks, disconnections, and insulation failures. You receive a written report with findings, photos, and recommendations — before any work is proposed.
Typical scenario: Homeowner suspects duct issues but isn't sure; new-to-homeowner wanting baseline assessment; pre-installation duct condition check.
We seal leaks at connections, joints, and boot-to-register transitions using mastic sealant and metal-backed tape (UL-listed, not cloth "duct tape" which fails in attic heat). Disconnected sections are reconnected and secured with mechanical fasteners. Crushed or kinked flex duct is repositioned and supported properly. Small holes and tears are patched; larger damage may require section replacement.
Typical scenario: Uneven cooling, high energy bills, visible duct damage, post-repair airflow improvement.
When ductwork is too deteriorated for repair — common in Jacksonville homes built before 1990 with original flex duct that has become brittle, separated from boots, or lost its insulation R-value — we replace duct runs with properly sized, insulated, and sealed new ductwork. Replacement may involve individual runs or the complete duct system depending on overall condition.
Typical scenario: 40–60 year old ductwork in pre-1990 homes, rodent-damaged runs, ductwork failing during AC installation.
When you add a room, convert a garage, or reconfigure living space, the existing duct system may not reach the new area. We design and install new duct runs sized to your AC system's capacity, ensuring the added space receives adequate airflow without starving existing rooms. We also modify ductwork during new AC installations when the replacement system has different airflow requirements than the original.
Typical scenario: Room additions, garage conversions, layout changes, new AC system with different airflow specs.
Ductwork problems are worse here than in cooler climates. Florida's heat, humidity, aging housing stock, and year-round pest activity all compound the energy waste of even small duct leaks.
Most Jacksonville homes route ductwork through unconditioned attic space. When your attic hits 140°F and your supply air is 55°F, the temperature difference across the duct wall is 85 degrees. Poorly insulated or uninsulated ducts absorb that heat, delivering warm air to rooms instead of cold. Even well-insulated ducts lose efficiency in this extreme gradient.
When cold supply air moves through hot, humid attic space in ducts with inadequate insulation, condensation forms on the duct exterior — or worse, inside the duct. This moisture promotes mold growth, degrades insulation, and can drip onto ceilings below, causing water stains and structural damage.
Neighborhoods like Arlington, Southside, San Jose, and older sections of Mandarin contain significant numbers of homes built in the 1960s through 1980s. The original flex duct in these homes is now 40–60 years old. Flex duct was not designed for that lifespan — the inner liner separates, insulation compresses and loses R-value, and connections loosen over decades of thermal cycling.
Jacksonville's warm climate supports year-round rodent and insect activity. Rats, mice, and squirrels commonly nest in ductwork running through crawlspaces and attics, chewing holes in flex duct and contaminating the air supply with droppings and nesting material.
Every hour of operation with leaking ducts compounds the energy waste. Over a cooling season, a duct system leaking 25% of its air costs the equivalent of running your AC for an extra 625 hours — roughly three months of additional runtime that you're paying JEA for without receiving any cooling benefit.
From the first phone call to a sealed, efficient duct system — here's what to expect.
We access your attic and crawlspace runs, check every connection point, measure airflow at supply vents, and identify leaks, disconnections, and insulation failures. The inspection takes less than an hour.
You receive a written report with photos, findings, and a clear scope of work. We explain what we'd repair, what we'd seal, and what we'd replace — and why — before any work is proposed.
Once you approve the quote, we seal leaks with mastic and UL-listed metal tape, reconnect or replace damaged sections, reposition crushed flex duct, and verify insulation and support along every run.
We re-test airflow, confirm leaks are sealed, and walk you through what was done. If you'd like, we can also evaluate whether duct cleaning or IAQ upgrades make sense now that the system is sealed.
FOR PROPERTY MANAGERS
Ductwork problems in rental units directly affect tenant satisfaction, energy costs (which you may or may not pass through to tenants), and the lifespan of your HVAC equipment. Cool & Cozy inspects ductwork as part of portfolio maintenance agreements and can assess duct condition across all your Jacksonville properties in a single coordinated effort. We prioritize the worst-performing units for repair or replacement and provide per-unit condition reports for your capital planning.
Ductwork repair costs vary widely depending on the scope. Sealing accessible leaks at connections and joints typically costs $300 to $700. Repairing or replacing individual damaged duct runs ranges from $500 to $1,500 per run depending on location and accessibility. Full duct system replacement for a typical Jacksonville home ranges from $2,000 to $5,000+. Cool & Cozy provides a free inspection with a written report and quote before any work begins.
The most common signs of duct leaks are rooms that never reach the thermostat's set temperature, unusually high energy bills, excessive dust in the house, and visible damage to ductwork in your attic or crawlspace. Cool & Cozy performs pressure testing and visual inspection to identify and quantify duct leaks. In many cases, we can show you the leaks directly during the inspection.
Cool & Cozy focuses on ductwork repair, sealing, and replacement rather than standalone duct cleaning. Our perspective, based on EPA guidance, is that duct cleaning alone is rarely effective if the underlying leaks and damage are not addressed first. Cleaning ducts that are still leaking means you're cleaning contamination that will return immediately. We do clean accessible duct surfaces as part of repair and replacement projects, and we can recommend reputable duct cleaning specialists if cleaning is appropriate for your situation after the duct system is sealed.
Sealing and minor repairs are typically completed in half a day (3 to 4 hours). Replacing individual duct runs takes a full day. Complete duct system replacement for a typical Jacksonville home takes 1 to 2 days depending on the size of the home and accessibility of the duct routing. We provide a specific timeline during your free inspection based on the scope of work your system needs.
In most cases, yes. Installing a new high-efficiency AC system on deteriorated ductwork is like putting a new engine in a car with flat tires. The new system cannot perform to its rated efficiency if 20 to 30 percent of its output is leaking into the attic. Cool & Cozy evaluates ductwork condition as part of every AC installation estimate and recommends duct repair, sealing, or replacement when it would materially improve the new system's performance. Addressing ductwork during installation is also more cost-effective than doing it as a separate project later.
Ductwork rarely stands alone — these adjacent services often pair with duct repair.
If weak airflow or uneven cooling turns out to be an AC system issue rather than a duct problem, our technicians diagnose and repair the root cause.
Learn MoreDuct repair or replacement is most cost-effective when done alongside a new AC installation. We handle both as one coordinated project.
Learn MoreSealed ducts are the foundation of good indoor air quality. Pair duct repair with filtration, UV lights, or dehumidification for complete IAQ improvement.
Learn MoreA free duct inspection takes less than an hour and shows you exactly where your cooled air is going — and how much you're paying JEA to cool your attic. Call us, and we'll show you what your ducts are actually doing.
