$5,000 to $12,000 for a typical single family home, with many projects in the $7,500 to $10,000 range. Cost varies with home size, duct material, vent quantity, labor rates and attic/crawl space access. Los Angeles jobs tend to run higher because of labor, permits and older homes. Anticipate more for sealed, insulated ducts that satisfy Title 24. The sections below dissect each of these factors.
The Real Cost of New HVAC Duct Installation
Average totals range from $453 to $2,189, with a national median around $1,252 for limited projects. Full-home installs tend to fall somewhere between $1,400 and $5,600. Labor is the big line item—roughly 60% of the bill—while material type, access, and layout drive the remainder. Rates vary based on home square footage, the configuration of the system, and if it’s a retrofit or new construction.
Checklist of potential expenses:
- Materials: sheet metal ($7–$13/linear ft), fiberglass ($4–$6/linear ft), flex duct, boots, registers, sealants.
- Labor: install, sealing, testing; often 60% of total.
- Insulation: R-6 to R-8 where required; adds per-foot cost.
- Permits and inspections: $250–$1,500 depending on jurisdiction.
- Access-related work: crawlspace staging, attic flooring, safety setup.
- Repairs: drywall ($150–$325), ceilings ($300–$1,200), paint touch-ups.
- Abatement/remediation if found: asbestos up to $2,200; toxic mold as high as $6,000.
- Debris removal and disposal.
- Duct testing and balancing; optional upgrades like zoning dampers.
1. By Home Size
Install prices are typically quoted per linear foot. Average comes in at $10 to $40 per foot for easy installs, and $20 to $60 where labor and materials are higher. Larger homes require more runs and branches, so both material and labor scale up.
Older or giant homes requiring retrofits can reach $30–$50 per foot because of tight access, rerouting, or code upgrades. A 2,500 sq. Ft. Two-story with attic ducts and returns on each floor can escalate quickly if framing changes or firestopping are needed.
Table: average install by home size (ballpark)
- Small (under 1,200 sq. ft.): $1,400–$3,000
- Medium (1,200–2,000 sq. ft.): $2,200–$4,500
- Large (2,000–3,000+ sq. ft.): $3,500–$7,300
There’s duct all along the length of these drives—both material and labor, so precise takeoffs count.
2. By System Type
Central AC and gas furnace combos usually utilize standard supply/return trunks and branches – costs remain in the mid ranges if access is clean. Heat pumps follow suit, although sizing and return paths may vary.
Ductless mini-splits reduce duct cost to zero, but equipment can be higher per zone. Or a multi-zone ductless setup might beat complicated ducting in an older home with tight chases.
Zoned or multi-air-handler systems add dampers, control boards, and more branches, increasing duct costs and labor. Typical ranges by setup: simple single-stage central system with ducts $2,000–$4,000; multi-zone ducted $3,500–$7,000; ductless multi-zone varies by heads but removes duct spend.
3. By New Construction
New builds go cheaper than retrofits because framing is open, runs are straight, layout is thought out. Crews install trunks, right-size returns, and code-insulate in a single pass, ensuring better airflow and reduced energy waste moving forward.
Builders also bunch labor with other trades, which can slash hours and change orders. Fold the duct design into the HVAC load calc at the beginning for cleaner results and less re-work.
4. By Retrofit
Simply just working in finished spaces bumps labor rates since techs fish lines through walls, ceilings, or crawlspaces, and protect finishes. More site time, more fittings, slower going.
Sneaky problems can arise–like ancient wiring, plumbing clashes, or unsealed chases–all driving up expense. Remember to schedule demo, debris removal, patchwork, and painting. Wall or ceiling ducts can cost $1,000–$4,000 to replace and crawlspace systems typically fall between $3,000–$7,300.
Pencil in a buffer for curveballs and code refreshes such as fire-rated sealants or smoke detectors linked to the system.
5. A Note on Ontario
Local rules move sums. Ontario might edge a bit higher because of labor rates, the extent of permits, and colder climate requirements. Thicker duct insulation and vapor barriers mean more material and more time.
Permit and inspection fees can run on the high side, and energy code requirements can cause duct sealing and testing measures. Factor these when mapping costs and timelines. Lifespan averages 10-25 years, but climate and installation quality influence it.
Key Factors That Shape Your Final Bill
Scope, material selections, labor and design decisions are what propel ductwork costs. Local market rates, home layout and the HVAC system you pair with the ducts can swing totals from a few thousand dollars to well over ten.
Duct Material
Material | Typical Cost per linear foot | Notes |
|---|---|---|
Non‑insulated flex (polyester/PVC) | $1.50–$3.00 | Low cost, easy install, shorter lifespan |
| Insulated flex (R-6 to R-8) | $3.00–$6.00 | Typical in attics/crawl spaces |
| Fiberglass duct board | $4.00–$8.00 | Built-in insulation, lighter
| Galvanized steel (sheet metal) | $6.00–$13.00 | Durable, rigid, higher labor
| Lined/insulated metal | $9.00–$18.00 | Better acoustics/efficiency |
Galvanized steel holds up and does not tear, whereas it is more expensive than polyester or non‑insulated flex. It’s a more time-consuming material to fabricate and seal, which increases labor.
Your insulation level (R‑value) and metal gauge matter. Thicker and more insulating materials increase material cost but reduce heat gain/loss in hot attics or cool basements. That can keep energy-stealing leaks, which typically spike at 20–30% with substandard ducts, at bay.
Balance initial cost with longevity, static pressure requirements, and maintenance. For long runs or high airflow, rigid metal with proper sealing might pay off over time.
Labor Rates
HVAC pros typically charge $50–$110 per hour, and labor is about 60% of a complete duct installation. For example, in expensive areas such as the Northeast and West Coast, rates run higher — and so do bids.
Tight crawl spaces, two story chases or plaster ceilings can add hours. The complexity of a particular project fuels labor time, which fuels the invoice.
Shop local rates and ask for itemized quotes that separate demo, fabrication, install, sealing, insulation, testing and permits. An experienced team might be pricier but can sidestep expensive rework down the road.
Home Complexity
Multi‑story homes, low-clearance attics or slab foundations all extend planning time and delay the install. Custom beams, vaulted ceilings, or long branch runs require more fittings and hangers.
Older homes can conceal asbestos duct wrap, knob-and-tube wiring, or undersized returns. Remediation and upgrades increase cost and add days.
Make a room-by-room duct plan with load notes, routes and access points. Identify roadblocks ahead of time to hold change orders in control.
System Design
Right-sized ducts and a clean layout preserve airflow, comfort and bills. Bad design leads to hot/cold spots and can waste 20–30% of energy.
Zoning and multi‑zone designs introduce dampers, controls and additional trunks, which increase cost but can address uneven rooms. Add-ons—multi-speed fans, motorized shutters and extra insulation—can add up $3,600.
Match ductwork to system type and size. A ducted air‑source heat pump could cost $4,500–$8,000 and to pair its 1.5‑ to 5‑ton capacity with correct duct sizing so a larger home doesn’t default to an oversized unit. Work with a reputable contractor who does load calcs and gives you a complete cost break out.
How Location Impacts Installation Costs
Regional climate, local codes and permits influence the scale and cost of a new HVAC duct installation. Labor and material rates fluctuate by market, and site conditions—attic, crawlspace, basement or in-wall runs—affect access time and finish work. Think regional standards, climate add-ons and city-specific fees when budgeting.
Regional Climate
Homes in extremely hot or cold zones may require thicker duct wrap or increased R-values to retain supply air temperature. That adds material and labor — particularly on long runs.
Humid areas demand moisture-resistant liners or sealed metal to reduce mold and mildew. Coastal markets, in particular, may require corrosion-resistant fasteners and vapor barriers.
Cold climates require TIGHTER sealing at joints and boots and additional insulation around supply trunks in unconditioned spaces. This can pile on hours during install and test.
- Hot-dry (e.g., Phoenix): high-R insulation, radiant-heat exposure controls
- Hot-humid (e.g., Gulf Coast): vapor barriers, mold-resistant liners, sealed metal
- Mixed (e.g., Mid-Atlantic): moderate insulation, balanced supply/return sizing
- Cold (e.g., Upper Midwest): advanced air sealing, thick wrap, mastic at all seams
- Coastal: corrosion-resistant hangers, straps, and hardware
Local Codes
Local building codes establish minimums for duct materials, insulation R-values, sealing methods, support spacing, and fire safety in chases and garages. A few cities require Manual D for duct design, smoke/fire dampers at rated walls and duct leakage testing in order to pass inspection.
Skip a code item and you’ve got rework, failed inspections and surcharges. That can stall the work and increase expenses, particularly in older houses where access is cramped or asbestos is detected and needs to be removed.
Check code codes before work begins. You should request your contractor in writing that the design and specs comply with local codes and energy standards in effect at the time, along with copies of duct sizing calculations, leakage tests and inspection approvals.
Permit Fees
Ductwork permit fees usually range from $250 to $1,500, but dense urban centers and places with rigorous testing may top out higher. Overly complicated projects, historic homes, or complete redesigns can prompt add-on permits for mechanical, electrical, or fire safety.
These fees are for a legal, safe install and typically include plan review and inspections. Include them into the budget up front to prevent surprises.
Although costs still vary with access and home size. Attic ducts usually cost $2,200 to $5,600. Crawlspaces $3,000 to $7,300. Basements $1,800 to $3,100. In-wall or ceiling replacements $1,000 to $4,000. $1,400 for simple runs in a 1,000-square-foot home to $9,000 for a 4,000-square-foot home with extreme-climate needs. Labor and materials are more expensive in urban than rural areas. Older homes may require redesign or asbestos removal. Where each duct is located has an impact, even if it’s only a partial replacement.
The Repair Versus Replace Dilemma
Patching old ducts versus installing new ones, cost, age, condition, performance. While repairs to your roof can only run a couple hundred dollars for small leaks to a few thousand dollars, total replacement typically falls between $4,000–$6,000+, based on home size, material selection, labor and permitting. Air ducts can make it 10–15 years, but once you’re outside of that window, efficiency loss, air leaks, and hygiene problems begin to accumulate. Once repairs stack up or comfort still lags post-fix, replacement is usually the best long-term value.
Signs of Failure
- Inconsistent room temps: hot upstairs, chilly downstairs, or swings between cycles. Heavily damaged insulation.
- Excess dust or musty smells: debris pulled from attics or crawl spaces through leaks, then blown into living areas.
- High energy bills: ENERGY STAR notes duct leaks can waste up to 20% of heating and cooling output, which shows up on monthly costs.
- Visible damage: kinks, gaps, torn insulation, rodent damage, rusted sheet metal, or mold staining.
- Noisy airflow: whistling, rattling, or booming at start-up can signal loose connections or pressure issues.
- Weak airflow: rooms that never seem to get enough air even after filter changes may have blockages or collapsed flex.
Checklist:
- Age over 10–15 years
- Repeated seal failures after prior repairs
- Rust or mold growth on or in ducts
- Thermal insulation missing, wet, or sagging
- Air leaks at boots, joints, and plenums
- Comfort complaints despite recent HVAC service
Efficiency Gains
New ducts reduce waste by right-sizing trunks and branches, sealing joints and balancing airflow. Properly sized and sealed ducts minimize leaks and pressure drops, both of which reduce run time and monthly utility bills. Replacing thin, leaky flex with insulated flex, fiberboard, or sealed sheet metal can boost the apparent efficiency of the entire hvac system.
Material costs vary: flexible non-insulated about $1–$3 per linear foot, flexible insulated $2–$4, fiberboard $4–$6, and sheet metal $7–$13. Factor in labor and design into the comparison. If repairs such as manual mastic sealing run $500–$1,500, and Aeroseal (which can cut leakage up to 80%) is higher, model payback: compare current bills versus projected savings over 5–10 years. For most homes, unlike her situation, stopping 20% leakage covers part of a replacement.
Health Benefits
Whether it’s replacing old or contaminated ducts, duct cleaning can reduce dust, allergens and mold which improves indoor air quality year-round and reduces clean-up around the home.
New, sealed ducts prevent attic or crawl-space pollutants from seaping in. Good insulation keeps surface temps in check, reduces condensation, and the chance for mold. More even air delivery helps keep humidity steadier, which is better for lungs, skin, and sleep.
Beyond the Quote: Hidden Costs and True Value
Sticker prices seldom reflect what new HVAC duct installation actually entails. Plan for overtime, quantify durability, and evaluate design, because these influence both initial and lifespan expenses.
- Hidden costs to watch: * Wall and ceiling touch-ups and repairs.
- Asbestos testing and abatement.
- Cleanup and hauling after installation
The Price of Poor Design
Undersized trunks, long runs and scarce returns drive static pressure up, slice airflow and create hot and cold spots. …whatever makes the system run longer to catch up, which shows up on your energy bill and in uneven rooms. As much as 30% of air can leak from weak joints or poorly sealed seams, so bad design plus lazy sealing is a double whammy.
If you wait until sheetrock is closed to address the layout errors, that means more demolition, more labor and change orders. A late stage redesign and rework can cost an order of magnitude more that a well thought out plan at the start! Overworked machine works harder, reducing life and increasing maintenance.
A proper Manual D and Manual J plan, with pressure targets and proper return sizing, keeps air balanced. It protects the investment in a high-SEER system, which only scores its savings if ducts are correct.
The Cost of Wall Repair
Cutting chases or soffits or ceiling bays to run new ducts necessitates patching, texture match and paint, from around $150 to $1,200. Smooth Level 5 walls, custom plaster, or detailed crown in homes can push restoration higher.
Request line-item allowances for drywall, texture and paint in the original quote. It keeps expectations upfront and sidesteps those end-of-the-project add-ons.
Leaving surfaces post-project clean is job #7, not an add-on.
The Value of a Warranty
A good warranty on ducts, fittings and install labor protects you against defects and callbacks that may arise months later. Several white glove HVAC contractors tuck parts and labor warranty into their bundle, which provides real value.
Because energy costs amount to 60%–70% of lifetime HVAC spend, protecting performance matters. Across 15 years—the average system lifetime—an “expensive” high-efficiency configuration frequently costs less than a “cheap” baseline when energy and maintenance are included. Review terms: what’s covered, duration, required maintenance, and transfer rules.
The Asbestos Surprise
Older homes can hide asbestos around ducts or in mastic, with abatement typically $250 to $700. Licensed pros should do legal removal prior to new ductwork, which can postpone schedules and increase total cost.
Give yourself extra time and budget for inspection if the house is pre-1980s. Catching it early avoids mid-project stops.
Long-term value notes: Systems with 19+ SEER can cost $3,000–$6,000 more but may save 20%–30% on energy. A 16.5 SEER2 upgrade could cost $2,000 more but save around $140 annually if cooling costs are $1,200. Most system or efficiency upgrades yield a return in 5–10 years, often 5–8 through energy alone, particularly if ducts are tight. When installed right and cared for, quality systems run 15–25 years.
What to Expect During Installation
New ductwork is a project-based, phased with scheduled downtime and line-item costs sort of thing. Not DIY work, unless you’re installing a simple window AC – get a licensed HVAC contractor.
Planning
A contractor measures your home, plans a duct layout and sizes trunks and runs to code and airflow goals. The layout shapes cost: larger homes or long runs add labor and materials. Ductwork tends to be $1 to $13 per linear foot, with most jobs coming in around $3,500. If you have approximately 100 feet of duct, complete replacement is frequently $2,000-$6,000. Permits are common and city-specific, usually less than $100 to $500+. Look for line items for a new thermostat ($120–$260), duct insulation (around $1,500) and, if required, asbestos removal ($1,200–$3,100). Opting for more efficient equipment can tack on $350 to $1,500 per rating increment but will reduce bills in the long term.
Demolition
Crew tears out old ducts, grilles, and busted plenums. This can reveal underlying problems such as mold or vermiculite, which can increase scope and expense. There will be noise and fine dust and restricted attic or crawlspace access. Protect your furniture and plan pet and toddler safety. Heat or cool could be off during this phase.
Installation
New trunks and branches are installed per plans, with adequate support and grade. Metal or flex ducts are cut to length, transitions are fitted, and returns are sized to match supply. In a single story ranch, runs will be short and sweet, in a two story with tight chases, anticipate more time and fittings.
Sealing
All seams and joints receive mastic or UL-181 tape to eliminate air leaks. A good seal preserves comfort and avoids energy waste. Bad sealing can increase future utility expenses.
Insulation
Ducts in attics or garages are insulated to local code and to minimize heat gain or loss. In LA and comparable climates, attic ducts tend to require higher R-values for the summer heat.
Testing
Contractor finishes airflow balancing and might do a duct leakage test. Thermostat is hooked up and configured. System is exercised in heating and cooling modes to ensure stable operation.
Timelines differ. A simple switch in a smaller house typically requires 1–2 days. Big, complicated systems can run for four days or more, particularly with access restrictions.
Get ready by providing attic or crawl space access, relocating fragile objects and verifying parking and power requirements. Trade allergies, office hours and any asbestos background. Establish daily start/stop times, cleanup and who to call for changes.
Conclusion
To scope out a new duct job in Los Angeles, vet the bids and lock in the basics upfront. Square footage, duct run length, layout and roof type are just some of the factors that influence the price. As so do code requirements in LA County and the home’s age. We’re talking about a 1,500 – 2,000 sq ft house, which usually falls in the middle of the range. Bigger homes, tight crawl spaces, or asbestos checks drive up cost. A well-designed duct system increases air flow, reduces noise and can cut energy costs. A clean, sealed system assists air quality in smog season.
Want actual numbers for your dwelling? Take pictures of the attic, crawl and returns. Request a line-item bid with duct size, R-value and seal method. Contact us to initiate an easy, hassle-free quote.
Frequently Asked Questions
How much does new HVAC duct installation typically cost in Los Angeles?
How much does it cost to replace HVAC ductwork? Most LA homeowners pay $4,000–$9,000 for full duct replacement. Smaller homes can start around $3,000. Big or complicated configurations can be over $12,000. Costs vary by duct material, accessibility, permits and home age.
What factors influence my final ductwork price the most?
Key drivers are home size, duct material (flex vs. Sheet metal), access in attics/crawlspaces, code upgrades, insulation level (R-8+), # vents, and labor. Older LA homes might require asbestos handling or seismic strapping, which could raise the price.
Does location in LA really change the price?
Yes. Higher labor costs, permit fees, parking limitations and attic heat all impact LA pricing. Coastal regions might require corrosion resistance. Hillside homes and tight lots add labor time. City inspection requirements further increase cost and schedule.
Should I repair or replace my ducts?
Replace if ducts are undersized, leaky >20%, moldy, or made of deteriorating materials. Repairs fit for small leaks or broken branches. A duct leakage test and Manual D sizing assist in determining. Replacement frequently reduces energy bills and increases comfort.
What hidden costs should I budget for?
Don’t forget about permits, asbestos and/or lead testing, duct leakage testing, extra registers, sealing and mastic, attic platforms, insulation upgrades, drywall patching. If returns are undersized, rework adds expense. ALWAYS request a line-item quote.
How long does duct installation take in LA homes?
The majority of these projects last 1–3 days. Complicated two-story homes or cramped crawlspaces can require 3–5 days. Add on the time for permits and inspections. To counteract attic heat extremes that sometimes limit work hours, schedules may be stretched just a bit.
Which duct material is best for LA’s climate?
Insulated flex duct (R-8) is typical and economical. Durable and with better airflow, sheet metal with external insulation is pricier. For hot attics, high-R insulation and great sealing count more than material alone.
9 thoughts on “How much does new HVAC duct installation cost?”