What goes into an HVAC estimate
HVAC estimating sits at the intersection of three different cost models: equipment (priced by manufacturer schedule), sheet metal (priced by SMACNA labor productivity per pound of metal), and piping (priced by MCAA labor units per linear foot). A complete HVAC estimate ties all three together with controls, insulation, and TAB to deliver an in-place cost.
Equipment schedule
Every piece of HVAC equipment on the schedule gets line items:
- Rooftop units (RTU) by tonnage and configuration
- Air handlers (AHU) by CFM and components (preheat, cool, reheat, energy recovery)
- Chillers (air-cooled, water-cooled, magnetic-bearing) by tonnage
- Boilers (gas-fired, electric, condensing) by MBH
- Cooling towers, condensers, dry coolers
- Pumps (chilled water, hot water, condenser water, condensate)
- Exhaust fans, supply fans, transfer fans
- VAV terminals, FPB units, fan-powered boxes
- VRF outdoor units, indoor units, branch boxes
- Heat pumps (split, packaged)
- Energy recovery ventilators, dedicated outdoor air systems
- Humidifiers, dehumidifiers
Each item gets manufacturer-specific pricing where the spec calls out a basis of design, or current market pricing for the equipment class.
Ductwork
Sheet metal is the largest non-equipment cost in most HVAC bids. We take off:
- Linear feet by gauge — 26, 24, 22, 20, 18, 16 gauge depending on size and pressure
- Pressure class — 1”, 2”, 3”, 4”, 6”, 10” WG
- Material — galvanized steel (most common), aluminum, stainless, FRP
- Insulation — duct wrap or duct liner by thickness and R-value
- Fittings — elbows, transitions, tees, takeoffs, dampers
- Hangers and supports
Output includes total weight in pounds — the unit for sheet-metal shop labor productivity in SMACNA standards.
Piping
Hydronic piping (chilled water, hot water, condenser water), refrigerant piping (R-410A, R-454B, R-32 line sets), condensate drainage, and where applicable steam and condensate return.
By size, schedule, and material:
- Copper (Type L, K, M) for hydronic, refrigerant, condensate
- Black steel (Schedule 40, 80) for hydronic, steam
- Stainless for specialty applications
- CPVC/PVC for condensate and certain low-pressure applications
Insulation
Mineral fiber, cellular glass, polyisocyanurate, elastomeric — by application, thickness, and linear feet or square feet.
Controls
Building automation by point count (analog inputs, analog outputs, digital inputs, digital outputs), with controller hardware, sensors, actuators, network, and programming hours.
TAB and Commissioning
Test, Adjust, Balance services priced by outlet count, equipment count, or percentage of installed value. Commissioning priced as a percentage of project value.
SMACNA labor productivity
Sheet metal labor in the United States is benchmarked against SMACNA productivity standards — hours of fabrication and installation labor per pound of sheet metal, segregated by gauge, pressure class, and installation environment. We use SMACNA productivity as the baseline and adjust for project-specific conditions (height, congestion, working hours).
Project types
- Commercial offices, retail, hospitality
- Healthcare (hospital, ASC, MOB)
- Education (K-12, higher ed, labs)
- Industrial (clean rooms, processing, manufacturing)
- Data centers (precision cooling, hot aisle / cold aisle)
- Lab and research (fume hood ducting, exhaust systems)