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HVAC systems are the most interconnected trade in a building. A single air handling unit connects to supply ductwork, return ductwork, exhaust ductwork, chilled water piping, hot water piping, condensate drain piping, electrical power, controls wiring, and building automation. Missing any one of these connections in your estimate means a change order on the job site. Generic construction estimators treat HVAC as "duct square footage times a rate." But ductwork cost varies dramatically by shape (rectangular costs 30-40% more to fabricate than round), by gauge (heavier gauge for higher static pressure systems), by insulation (internal liner vs external wrap vs none), and by complexity (straight runs vs offsets, transitions, and tees). Our HVAC estimators use FastDUCT to measure every duct segment individually, applying the correct fabrication weight and liner specification. This is the level of detail that separates accurate HVAC bids from guesses. Related reading: What Is Included in MEP Estimating and Best Estimating Software for Construction.
HVAC costs divide into three distinct categories, each requiring different measurement techniques and pricing databases. We estimate each separately because they're often fabricated, supplied, and installed by different crews.
Supply, return, and exhaust ductwork measured by shape (rectangular, round, oval), size, gauge, and insulation type. Includes elbows, tees, transitions, offsets, reducers, dampers, and all sheet metal fittings. We calculate duct weight in pounds for fabrication pricing and linear/square footage for installation labor.
Typically 40-55% of total HVAC cost on commercial projects.
Air handling units, rooftop units, split systems, chillers, boilers, cooling towers, VAV/CAV boxes, pumps, and all mechanical equipment. Plus refrigerant piping, hydronic piping, condensate drains, and all associated valves, fittings, and insulation. Equipment is priced by capacity and manufacturer specification.
Typically 30-40% of total HVAC cost on commercial projects.
Building automation systems (BAS), DDC controllers, thermostats, sensors, actuators, diffusers, grilles, registers, exhaust fans, hangers, supports, and vibration isolation. Controls scope is frequently underestimated because it's spread across multiple drawing sheets and specification sections.
Typically 10-20% of total HVAC cost but the most commonly missed scope.
Rectangular Ductwork
Round/Spiral Duct
Air Handling Units
Rooftop Units
VAV/CAV Boxes
Diffusers & Grilles
Exhaust Fans
Refrigerant Piping
Hydronic Piping
Condensate Drains
Duct Insulation
Pipe Insulation
Hangers & Supports
BAS/DDC Controls
Dampers & Actuators
Sheet Metal Fittings
HVAC estimating requires coordinating mechanical plans, equipment schedules, duct details, and piping diagrams together. Here's how our HVAC estimators approach every project:
Drawing & Schedule Review
Review mechanical plans, equipment schedules, duct details, piping diagrams, and specifications to identify complete HVAC scope and system types.
Ductwork Takeoff (FastDUCT)
Measure every duct segment by shape, size, and gauge using FastDUCT. Calculate fabrication weight in pounds and fitting counts for each duct run.
Equipment Scheduling
List all equipment from schedules — AHUs, RTUs, split systems, VAV boxes, exhaust fans, pumps — with capacities and specifications for vendor pricing.
Piping & Insulation
Measure refrigerant piping, hydronic piping, and condensate by diameter and run length. Calculate duct and pipe insulation quantities by type and thickness.
Controls & Accessories
Count BAS controllers, thermostats, sensors, damper actuators, diffusers, grilles, registers, hangers, supports, and vibration isolation from control diagrams and reflected ceiling plans.
Pricing & Senior Review
Apply RSMeans zip-code pricing for material and labor. Senior MEP estimator review. Deliver Excel organized by system with color-coded duct plan markups.
For more on estimating methodology, read our construction cost estimating guide.
Trade-specific HVAC subcontractors who install ductwork, equipment, piping, and controls. We format estimates by system so your bid matches how you self-perform or subcontract each scope.
Duct fabrication shops that need duct weights in pounds, fitting counts, and shop drawing support. We provide fabrication-ready takeoffs with duct dimensions and gauge specifications.
GCs who need Division 23 scope estimated for budget verification or sub bid comparison. Design engineers who need HVAC cost analysis during schematic or design development phases.
FastDUCT Duct Takeoffs
We use FastDUCT — purpose-built software for HVAC ductwork — not generic area calculators. Every duct segment is measured individually with correct gauge, liner, and fitting count.
Fabrication-Weight Pricing
For sheet metal contractors, we calculate duct weight in pounds — the metric that drives fabrication cost — not just linear or square footage.
Controls Scope Included
BAS and controls are the most commonly missed HVAC scope. We pull controls from control diagrams, sequences, and specifications — not just mechanical plans.
Shop Drawing Support
We provide HVAC shop drawings for duct fabrication and equipment placement — giving fabricators and installers coordinated installation documents.
60% Cost Savings
An in-house HVAC estimator costs $70K-$90K/year. Our monthly package covers 10-15 projects for $2,000 — saving you 60% on estimating expenses.
24-48 Hour Residential
Residential HVAC estimates within 24-48 hours. Commercial projects 2-5 business days depending on system complexity and number of zones.
HVAC estimating is one of the most software-intensive trades. A proper HVAC takeoff requires FastDUCT or equivalent duct estimating software ($3,000-$8,000/year), Planswift or Bluebeam ($2,000-$5,000/year), RSMeans or equivalent pricing database ($2,000-$4,000/year), and an estimator trained on all three ($70,000-$90,000/year salary). Total cost of an in-house HVAC estimating setup: $77,000-$107,000/year before benefits and overhead.
Phoenix Estimations provides the same tool stack and estimator expertise at $150/project or $2,000/month for 10-15 projects. You get FastDUCT-quality duct takeoffs, RSMeans pricing, and senior estimator review without any of the fixed overhead. Scale up for busy months, scale down for slow months.
"Phoenix's duct takeoffs are measured segment by segment in FastDUCT — not estimated by the square foot like our previous service. Our ductwork material orders now match the job within 3%. That precision pays for itself on every project."
"We bid 25+ commercial HVAC jobs per month. Phoenix handles every estimate — ductwork, equipment, piping, controls, insulation — organized by system. Our win rate went from 19% to 42% in the first 6 months."
"We're a sheet metal fabrication shop. Phoenix gives us duct weights in pounds with fitting counts — exactly what we need to price fabrication. No other estimating service does this."
The Problem
A 20-person HVAC subcontractor in Houston was bidding on 30 commercial jobs per month but could only estimate 15-18 with their single in-house estimator. Ductwork quantities were consistently 10-15% off because their estimator used area-based calculations instead of segment-by-segment measurement. The result: $6,000-$10,000 in re-orders per project, plus lost bids on the 12-15 projects they couldn't price in time.
The Solution
Phoenix Estimations took over all 30 monthly HVAC estimates using FastDUCT for ductwork and Planswift for piping and equipment. Every duct segment was measured individually by shape, size, and gauge. Equipment was listed from schedules with manufacturer specifications. Controls were pulled from BAS diagrams. Each estimate had 40-60 line items organized by system with RSMeans Houston pricing and color-coded duct plan markups.
The Outcomes
Ductwork accuracy improved to within 2%, eliminating material re-orders entirely and saving $180,000+ annually. The contractor now bids all 30+ jobs per month without capacity constraints. Win rate increased from 19% to 43%. The outsourced estimating cost 60% less than their previous in-house setup while handling nearly double the volume. Revenue grew 35% in year one.
What Is Included in MEP Estimating?
Blog guide covering HVAC, plumbing, and electrical scope within MEP estimates.
Best Estimating Software for Construction
Review of FastDUCT, Planswift, Bluebeam, and other estimating tools we use.
Mechanical Estimating Services
Combined HVAC + Plumbing + Piping estimating for full mechanical scope.
