Leaky ducts waste 20-30% of your cooling and heating. Flat-rate residential duct sealing, repair, and replacement in Lewisville. Static pressure diagnostic $85 (waived with repair). Licensed TACLA126718E, EPA 608 Universal certified, family-owned since 2018.
Real stories from recent Frosty's HVAC jobs in Lewisville, TX -- published straight from the field.
A family on Tucson Dr in Lewisville came home from two weeks away to a unit that had gone from blowing hot air to just buzzing with no airflow at all. Our tech tracked it down to a failing capacitor on their hard-working condenser, replaced it, and got the system running again — ...
Ductwork in Lewisville starts at $85 for a static pressure diagnostic (waived with any repair). Most homes need 2-5 targeted repairs, not a full duct redesign. We're flat-rate, which means the price quoted before we start is the price you pay at the end. Frosty Club members save 10-15% on every job.
| Service | Regular Price | Frosty Club Member |
|---|---|---|
| Diagnostic / static pressure test(Waived with repair) | $85 | $0 — never for members |
| Duct sealing (per repair) | $350 | $297.50 |
| Full duct replacement (per run) | $700 | $595 |
| Plenum replacement | $1,200 – $1,500 | $1,020 – $1,275 |
| Basic tune-up (related upsell) | $150 | $127.50 |
Per the EPA, indoor air is 2-5x more polluted than outdoor air — and leaky ducts are one of the main causes. Every crack, loose connection, and failed tape seal pulls unfiltered attic air (dust, pollen, insulation fibers, rodent droppings) directly into your supply stream. Sealing and replacing bad runs is one of the highest-impact IAQ improvements we make.
Basic ($99/yr):10% off all services | Premium ($300/yr): 15% off + $500 repair credit + 2 free tune-ups/year
Join Frosty ClubLeaky and undersized ducts are the single most-missed cause of comfort problems I see in DFW homes. Here's what we find most often on Lewisville diagnostic calls, and what each one typically costs to fix.
Classic sign of leaky supply runs or a failing zone damper. $85 diagnostic pinpoints the exact run. Fix is usually 1-3 duct repairs at $350 each.
Leaky returns pull unfiltered attic air straight into your supply stream. Sealing at $350 per repair stops the contamination at the source.
20-30% duct leakage means 20-30% more AC runtime. Sealing bad connections typically cuts summer bills 15-25%. 3-5 year payback.
Condensation inside flex liner leads to mold growth. You can't clean mold out of fiberglass — the only fix is replacement at $700 per run.
Usually undersized returns or crimped supply runs choking airflow. Manometer test during diagnostic measures exact loss. Fix varies by cause.
Leaky ducts pull pollen, dust, and insulation fibers into your breathing air. Duct sealing is one of the highest-impact IAQ improvements we make.
Lewisville ductwork tells three distinct age stories across 75056, 75067, and 75077. Old Town Lewisville 1960s-1970s ranches have ducts that have been through 50+ years of 140-160°F attic cycling — the original grey flex is long gone in most, replaced at some point with newer flex that's now 15-25 years old and showing mastic failure, joint separation, and inner liner delamination. Valley Vista (established 1986) homes have 40-year-old original runs that are uniformly past end of life. Then Castle Hills, with 4,300+ homes built since 1998, has flex duct that ranges from still-serviceable 10-year-old material to 25-year-old early-build runs with the same problems as Valley Vista. Lewisville Lake humidity accelerates all of it — biofilm grows faster on duct liners here than in inland Denton County.
For most Lewisville homes the right fix is targeted: seal joints and plenums ($350 flat, $297.50 for Frosty Club members), replace individual runs that have pulled away or show liner delamination ($700 per run), and leave intact runs alone. Plenum replacement runs $1,200-$1,500 when the main trunk box is deteriorated. Full duct replacement on a Lewisville home depends heavily on size — Old Town 1,500-2,000 sqft ranches with 8-10 runs are $5,600-$7,000, while Castle Hills 4,000-5,000 sqft homes with 16-20 runs can hit $11,200-$14,000. We do a 30-minute visual and smoke inspection first, then give you a flat-rate quote. No hourly billing.
Every Lewisville ductwork job includes before-and-after static pressure readings. Target on a healthy residential system is under 0.5 inches of water column; typical 20+ year old Lewisville homes run 0.6-0.9 — high but often salvageable with targeted sealing and run replacement. After the work we bring it back under 0.5. I don't sell standalone duct insulation as a product — if the ducts are deteriorated enough to need insulation attention, they need full replacement at $700 per run with modern R-8 insulated flex. I'm Omar Jacobo (EPA 608 Universal #2396328); Mariafernanda holds TACLA126718E.
Neighborhoods we serve in Lewisville: Castle Hills, Valley Vista, Old Town, Vista Ridge, Highland Village
Because every credential is independently verifiable and directly tied to the work — Texas HVAC Contractor License TACLA126718E covers duct modification and airflow, EPA Indoor Air Quality guidance drives our sealing and replacement decisions, and U.S. DOE research documents the 20-30% energy savings that back our flat-rate pricing.
Texas HVAC Contractor License held by Mariafernanda Jacobo. Issued and regulated by the Texas Department of Licensing and Regulation.
Per the U.S. EPA, leaky ducts are a primary contributor to poor indoor air quality. We measure, document, and fix.
The U.S. Department of Energy says duct losses can account for 20-30% of HVAC energy use. Sealing pays back fast.
Learn more about our credentials on our About page or visit omar-jacobo.com.
Frosty's covers every residential HVAC need in Lewisville, TX — one phone line, one flat-rate pricing book, one licensed (TACLA126718E) family-owned team.
Same flat-rate ductworkpricing across every city we cover. If you're in a Lewisville-adjacent neighborhood, these pages have local details for your ZIP.
Deeper context on ductwork written by Omar Jacobo (EPA 608 #2396328).
Signs: rooms that never cool or heat evenly, high Oncor summer bills, visible dust or mold near supply registers, musty smell when the AC runs, or ducts visibly detached in the attic. Old Town and Valley Vista homes with 20+ year old ductwork usually need at least partial replacement. Castle Hills homes under 15 years may only need sealing ($350). We inspect and quote before recommending anything.
Duct sealing $350 flat ($297.50 for Frosty Club members), duct replacement $700 per run ($595 for members), plenum replacement $1,200-$1,500. Old Town ranches with 8-10 runs run $5,600-$7,000 for full replacement; Castle Hills 4,000+ sqft homes with 16-20 runs typically land at $11,200-$14,000. Flat-rate quote before any work starts, including before-and-after static pressure readings.
Usually biofilm growth inside the flex duct liner. Lewisville Lake humidity accelerates this compared to inland DFW — Valley Vista and Vista Ridge homes near the water are most susceptible. We inspect the flex liner, plenum, and evaporator coil. If biofilm is confirmed, the right fix is replacement ($700/run) plus a coil deep-clean. Sealants and foggers don't kill mold — they just trap it.
Depends on condition. Castle Hills 2010s-era flex with intact inner liner and leaky joints seals well ($350). Old Town and Valley Vista ducts with delaminated liner or biofilm contamination need replacement — sealing won't hold on deteriorated material. We inspect first and give you the honest answer before quoting.
Castle Hills HOA governs exterior modifications, not interior ductwork. However, if you're selling a Castle Hills home and the inspection reveals duct issues, buyers in that price range will negotiate hard. Proactive ductwork assessment protects resale value. We provide documentation of static pressure readings and work performed that you can include in disclosure.
Yes — EPA 608 Universal cert #2396328 lets me legally recover, recycle, and recharge R-22 under federal regulations. R-22 production ended in 2020 under the Clean Air Act phase-out (EPA.gov), so it now runs $200 per pound installed. A typical Castle Hills and Valley Vista R-22 leak repair totals $650-$1,000: electronic leak detection ($250) or nitrogen leak test ($500) plus recharge at $200/lb. Optional leak seal $350 — but it can void manufacturer warranties, so I only recommend it in specific cases. For systems past 12 years with major leaks, planning the transition to R-454B or R-32 is usually the better economics. Read our R-410A phase-out explainer for DFW homeowners.
Yes — ductwork outlives 2-3 system replacements. R-410A new-equipment production ended Jan 2025 under the AIM Act (Energy.gov), so your next replacement will use R-454B or R-32. Sizing the Castle Hills and Valley Vista ductwork correctly now sets up the new system regardless of refrigerant. EPA 608 Universal cert #2396328 covers all refrigerant work. Read our R-410A phase-out explainer for DFW homeowners.
Call (469) 254-0548 or request service online to book an $85 static pressure diagnostic (waived with any repair). We schedule duct diagnostics within 1-3 days and bring a manometer, bore-scope, and written report to every call. Flat-rate pricing — no surprises, no hourly charges.
Written by Omar Jacobo, EPA 608 Universal Certified Lead Technician at Frosty's HVAC LLC. Licensed TACLA126718E.
Written by
By Omar Jacobo
Texas Licensed HVAC Contractor #TACLA126718E · EPA #2396328
Co-Owner of Frosty's HVAC LLC, serving DFW since 2018. Learn more
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