Overview
If your attic or crawl space feels like an oven in summer or a freezer in winter, your uninsulated ducts are working against you. Ducts that run through unconditioned spaces lose massive amounts of energy — cooling air is heated before it reaches your rooms, and warm air is chilled before it ever delivers comfort. At Green Seal Energy, we stop that loss with professional duct insulation and comprehensive repair. With 20+ years of Kansas City home performance experience, we fix the three most common duct problems: energy-robbing insulation loss, physically crushed or disconnected sections, and hidden leaks that waste conditioned air. We seal every accessible joint with high-temperature mastic or metal-backed tape, insulate every run in unconditioned space to the appropriate R-value, and repair every crushed, torn, or disconnected section we find. The result is a duct system that reliably delivers the warm or cool air you paid for — not to your attic or crawl space. We work in some of the most challenging conditions: fiberglass-insulated attics in August and damp crawl spaces in April. Our crews are equipped with full PPE. We handle the messy, difficult jobs that most other contractors won’t touch, and we do them right.
Education
Duct insulation and repair encompasses the full scope of getting your duct system physically back to peak performance. Most homeowners think of ductwork as sealed metal tubes, but in reality, it’s a complex system of supply plenums, return drops, branch runs, flexible ductwork, rigid trunk lines, and hundreds of individual joints and connections. Over time, many things go wrong. Insulation degrades, tears, or is chewed by rodents. Installers cut corners, leaving long runs uninsulated. Flex ducts get crushed, pinched, or disconnected. Rigid ducts develop leaks at every seam. Original mastic dries and cracks. Joints separate as the home settles. Professional repair starts with a thorough physical inspection of every accessible inch of your duct system. We look in attics, crawl spaces, basements, garages, and mechanical closets. We test accessible joints for leakage, search for disconnected sections, feel for crushed flex, and check every inch of insulation. Then, we fix what we find. For insulation, we wrap exposed runs with R-6 to R-8 fiberglass with foil backing, securing it properly and sealing all seams. For repair, we reconnect disconnects, patch crushed sections, replace rotten flex runs entirely, and seal every joint with mastic or metal-backed tape. For hidden leaks, we use our Aeroseal process.
We provide a Duct Leakage Test Report and Certificate showing duct leakage before and after sealing (see sample attached).
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Our Process
Why Green Seal Energy
Since 2004, Green Seal Energy has been the Kansas City metro’s go-to partner for home performance, energy efficiency, and HVAC services. Our credentials aren’t just marketing — they’re the result of 20+ years of consistent excellence.
Founded in 2004, Green Seal Energy has served tens of thousands of Kansas City homes across all neighborhoods and vent configurations.
As a certified Aeroseal Authorized Dealer, our technicians are trained to the highest industry standards in duct and vent sealing technology.
Recognized by EVERGY as their top-ranked energy efficiency partner in the Kansas City region — a distinction earned through performance and customer results.
Need to spread the cost? We offer flexible financing through Wisetack with 0% APR options. Check your rate in seconds — no hard credit pull required.
Benefits
Lower Energy Bills
Uninsulated ducts in unconditioned spaces lose massive energy — insulating stops the loss immediately.
Improved Comfort
Air arrives at your registers at the temperature it left the furnace — no more lukewarm delivery.
Protect Against Moisture
Insulation prevents condensation on cold ducts in summer, reducing mold risk in attics and crawl spaces.
Extend HVAC Life
Less heat gain and loss means less runtime. Insulated ducts help your system last longer.
Pricing & Cost
Vent length
Primary factor
Exit type (wall vs. rooftop)
+$30–$60 for roof
Vent material (flex vs. rigid)
Minor impact
Level of lint buildup
May add time
Number of bends/elbows
Minor impact
Bird nest or blockage removal
+$25–$75
Typical range for duct repairs in the Kansas City metro. Simple leak repair for accessible joints runs $150–$300. Swapping a damaged section of ductwork runs $500–$3,200. Adding insulation to exposed runs in an attic or crawl space ranges from $300 to $1,700. Complete projects covering hybrid scopes are priced accordingly.
Free Dryer Vent Cleaning with Duct Sealing
Schedule any duct insulation or repair project and we'll professionally clean your dryer vent at no additional charge (up to $149 value) — protects against fire hazard and improves dryer efficiency.
Maintenance depends on your lawn type and needs. Typically, weekly orbi-weekly visits keep your yard healthy and looking great.
Schedule your free evaluation and start saving on energy today.
