Why HVAC Duct Installation Fits Piece Rate
Duct installation is repetitive, measurable work. You're running trunk lines, pulling branch runs, cutting in registers, and connecting returns. An experienced duct installer who's done 300 houses can rough-in a system in half the time it takes someone still learning duct layouts. That speed difference is where piece rate benefits both the contractor and the installer.
I'm Tyson Faulkner. My background is roofing, not HVAC, but I've worked on plenty of new construction sites where the HVAC crew is roughing in ductwork in the same house where my roofers are overhead. The duct crews that get paid piece rate consistently finish faster and move to the next house sooner, which is why most production HVAC companies in residential new construction have adopted some form of per-house or per-ton pricing.
This guide covers real rate ranges for flex duct, sheet metal, and ductboard installation, what factors affect pricing, and how to structure a rate card for your crews.
How HVAC Duct Piece Rates Are Structured
Unlike trades that measure in square feet or linear feet, HVAC duct installation is typically priced in one of three ways:
- Per ton of cooling capacity: The total system tonnage determines the rate. A 3-ton system pays one rate; a 5-ton system pays more. This is the most common structure in production residential.
- Per register/run: Each supply register and return grille is a unit. The installer gets paid per completed run from the trunk line to the register.
- Per house (flat rate): For tract homes where every house has the same floor plan, a flat per-house rate is simplest.
Most residential HVAC contractors use per-ton or per-house pricing for production work, and per-register pricing for custom homes where the system size varies significantly.
Residential Duct Installation Rates
Per-Ton Rates
Flex duct systems (most common in residential new construction):
- Standard single-story: $150 to $250 per ton
- Two-story: $175 to $300 per ton
- Custom/complex floor plan: $225 to $350 per ton
Sheet metal trunk with flex branch runs:
- Standard: $200 to $325 per ton
- Two-story or complex: $250 to $400 per ton
All sheet metal (fabricated duct system):
- Standard residential: $300 to $500 per ton
- Custom or high-end residential: $400 to $650 per ton
For a standard 3-ton residential system in flex duct, the per-ton rate of $200 means $600 total for the duct rough-in. A 5-ton system at the same rate pays $1,000.
Per-Register Rates
Supply registers:
- Flex duct run to ceiling or wall register: $25 to $45 per register
- Sheet metal run to register: $40 to $65 per register
- Floor register (crawlspace or basement): $30 to $50 per register
Return air:
- Standard return grille: $30 to $55 per return
- Oversized or central return: $50 to $85 per return
- Return air duct (if separate from platform): $35 to $60 per run
Other components:
- Trunk line (main supply plenum): $75 to $150 per trunk
- Filter rack/return air box: $30 to $60 per unit
- Bathroom exhaust duct: $20 to $40 per run
- Dryer vent: $25 to $45 per run
Per-House Rates (Production Homes)
For subdivisions where the same floor plan repeats:
- Standard 3-bed, 2-bath single-story (2.5-3 ton): $500 to $800 per house
- Standard 4-bed, 2.5-bath two-story (3.5-5 ton): $750 to $1,200 per house
These flat rates assume the installer has roughed in the same floor plan multiple times and can do it from memory.
What a Duct Installation Crew Should Earn Per Day
A two-person duct crew on production residential work should rough-in one standard house per day. On smaller homes or floor plans they've done repeatedly, a fast crew can complete 1.5 to 2 houses per day.
For a 3-ton single-story home at $200/ton:
- Total per house: $600
- Per installer: $300/day
- At 9-hour days: $33/hour effective rate
For a two-story, 4-ton house at $225/ton:
- Total per house: $900
- Per installer: $450/day
- At 9-hour days: $50/hour effective rate
The two-story pays more per ton because it takes longer, but the total per house is also higher. A crew that can complete a two-story house per day earns significantly more than one doing single-story work at a lower per-ton rate.
Use our Piece Rate Calculator to model rates for your specific system sizes and crew configurations.
Factors That Push Duct Installation Rates Higher
Duct material. Flex duct is the fastest to install — it pulls, bends, and connects with straps and mastic. Sheet metal requires fabrication, hanging, sealing, and more precise connections. All-sheet-metal systems take 2-3x longer than equivalent flex systems, and the rate should reflect that.
Number of stories. Single-story homes with attic access are baseline. Two-story homes require vertical runs through walls or chases, fire dampers, and working in tighter spaces. Three-story homes compound these challenges.
Attic conditions. A spacious attic with good access and standing room is baseline. Low-pitch roofs (4/12 or less) where the installer is crawling, extreme attic temperatures (130+ degrees in summer), and limited access points all reduce production.
System complexity. A standard single-zone system is fast. Multi-zone systems with dampers, variable-speed equipment, and separate supply/return systems for each zone add installation time. Each zone may require its own trunk line and damper controls.
Building codes and energy requirements. Some states and municipalities require duct testing (duct blaster testing for air leakage), R-8 insulation on all ductwork, or specific sealing methods (mastic only, no tape). These requirements add time. In California, Title 24 compliance adds significant installation requirements compared to most other states.
Floor plan layout. Open floor plans with centrally located equipment are efficient — short duct runs, minimal transitions. Sprawling floor plans where the air handler is at one end and bedrooms are 60 feet away require long runs with more duct, more hangers, and more sealing.
Crawlspace or basement duct systems. Running ductwork under a house in a crawlspace is slower and more physically demanding than working in an attic. Crawlspace work should carry a 15-30% premium over attic installations.
Commercial Duct Installation Rates
Commercial ductwork is a different scale and typically uses fabricated sheet metal. Rates are usually per pound of sheet metal installed or per ton of system capacity.
Per pound of sheet metal:
- Standard commercial: $3.00 to $5.50 per pound
- Industrial or heavy gauge: $4.50 to $7.00 per pound
Per ton (commercial systems):
- Standard commercial: $250 to $450 per ton
- Complex (hospitals, labs, clean rooms): $400 to $700+ per ton
Commercial work involves larger duct sizes, heavier material, and more coordination with other trades. Production per day is measured differently — in pounds of duct hung or in tons of capacity installed.
Building an HVAC Duct Rate Card
| Work Type | Unit | Rate Range | Notes |
|---|---|---|---|
| Flex duct, single-story | per ton | $150-$250 | Baseline |
| Flex duct, two-story | per ton | $175-$300 | Multi-level premium |
| Sheet metal trunk + flex | per ton | $200-$325 | Hybrid system |
| All sheet metal | per ton | $300-$500 | Fabricated system |
| Supply register, flex | per register | $25-$45 | Ceiling or wall |
| Supply register, sheet metal | per register | $40-$65 | Fabricated run |
| Return air grille | per return | $30-$55 | Standard |
| Trunk line | each | $75-$150 | Main supply |
| Bath exhaust run | each | $20-$40 | To exterior vent |
| Dryer vent | each | $25-$45 | To exterior |
| Crawlspace premium | per ton | +15-30% | Below-floor work |
Give this to your crew before the job starts. If you're doing production homes, post the per-house rate with a breakdown so installers can see how the total was calculated. For more on setting up rate structures, see our guide on setting fair piece rates in construction.
Sample Earnings Calculation
A two-person crew roughs in ductwork for a 4-ton, two-story home with 12 supply registers, 3 returns, a main trunk line, and 3 bath exhaust runs. Using per-register pricing:
- 12 supply registers x $35 = $420
- 3 returns x $45 = $135
- 1 trunk line x $100 = $100
- 3 bath exhausts x $30 = $90
- Total: $745
Using per-ton pricing at $200/ton for the same 4-ton system:
- 4 tons x $200 = $800
The per-ton rate is simpler and slightly higher because it accounts for all the components in one number. Most contractors prefer per-ton for production work because it's one number to track per house.
If the crew completes the house in one day, that's $400 per person at the per-ton rate. Try your own combinations with our Piece Rate Calculator.
Compliance Considerations
Track Hours
Even with per-ton or per-house rates, you must track every hour worked. HVAC installers working in attics during summer routinely put in 50+ hour weeks to get houses done before the heat becomes unbearable. That means overtime is virtually guaranteed during peak season. See our guide on tracking hours for piece rate workers.
Overtime
Total weekly piece rate earnings divided by total hours = regular rate. Pay 0.5x that rate for every hour over 40. A crew that earns $3,200 in a 52-hour week has a regular rate of $61.54. Overtime premium is $30.77/hour for the 12 hours over 40 = $369.24 additional. Full calculation walkthrough in our overtime guide.
Heat Illness Prevention
This is a real issue for duct installers working in unconditioned attics. OSHA has increased enforcement of heat illness prevention, especially in Southern states. If your piece rate structure incentivizes crews to skip water breaks or push through unsafe heat exposure, you're creating a liability. Build mandatory break time into the rate or pay it separately.
Licensing
HVAC is a licensed trade in most states. Journeyman and apprentice rates should differ. Some contractors pay apprentices a percentage of the journeyman piece rate (60-75%); others pay apprentices hourly while the journeyman earns piece rate.
Regional Variation
- Climate drives system size. Gulf Coast and Southwest markets have larger cooling systems (4-5 ton is standard) which means higher total per-house earnings. Northern markets with smaller cooling loads and larger heating systems have different installation characteristics.
- Material preferences. Flex duct dominates the South and Southwest. Sheet metal is more common in the Northeast and Midwest. Some municipalities (parts of California, New York) restrict or prohibit flex duct, which changes the labor rate entirely.
- Energy codes. California (Title 24), Oregon, Washington, and several other states have aggressive energy codes that affect duct installation methods and testing requirements. These add time and the rates should reflect it.
Reviewing Rates
Review duct installation rates twice a year:
- Installer retention. If you're losing experienced duct installers, the per-ton rate is likely below market.
- Inspection pass rates. Duct installations that fail inspection (leakage testing, improper support, missing insulation) slow down the whole project. If failure rates are increasing, the crew may be rushing.
- Equipment changes. Variable-speed systems, mini-splits, and multi-zone equipment install differently than standard single-speed equipment. Update rates when you start installing new system types.
- Builder feedback. If the builder is complaining about schedule, your crew may need a rate bump to prioritize speed, or you may need to adjust crew sizing.
Track per-house earnings, tonnage, and crew hours with Piece Work Pro. For the broader view of piece rate across construction, read our guide on piece work in different construction trades.