Ductwork, equipment, and controls — quantified in one pass.
From Manual J load calcs to galvanized ductwork by the pound, Pilrs quantifies every HVAC system component on your drawings. Equipment schedules, refrigerant lineset runs, VAV boxes, and control wiring are all extracted and verified.
HVAC takeoffs are three estimating jobs in one. Sheet metal estimators count linear feet of duct and convert to pounds by gauge. Equipment estimators reconcile the schedule against rooftop unit, AHU, and VAV callouts. Controls estimators tally points off the BMS riser. On a typical 80,000 SF commercial mechanical bid, those three workflows touch 18-24 drawing sheets and a 40-page spec section, with a 3-4 day turnaround that no longer matches market bid pace.
The takeoff bottleneck is duct weight conversion. A 24x12 supply duct shown on the plan as 80 LF must be converted to pounds: perimeter is 6 LF, gauge is 24 (for 1" WG positive pressure per SMACNA), surface area is 480 SF, material weight is 1.156 lb/SF, raw weight is 555 lb — then add 6% for seam allowance, 4% for reinforcement, and joint stiffeners every 8 ft. That math, repeated across 200 duct segments, is where 12-18% of the bid hides.
Equipment kit accessories are the silent killer. A rooftop unit schedule lists "RTU-3, 25-ton, gas heat, economizer, hinged service panels". The accessory kit — convenience outlet, smoke detector, phase failure relay, isolation curb, smoke isolation damper, factory disconnect — adds $4,800-$8,200 of cost per unit that estimators routinely forget when they "just price the rooftop."
A 24x12 duct at 1" WG positive needs 24-gauge metal; the same duct at 4" WG (medium pressure return on a VAV system) needs 22-gauge with reinforcement at 4-foot intervals. Misread the pressure class on one trunk and the duct weight is off by 18% across the entire system. Plans show pressure class only in a single note — easy to skip.
A VAV box with a hot water reheat coil adds 0.3-0.5 inches of static pressure that must be carried in main duct sizing. If the takeoff treats the VAV as just a damper, the upstream main is undersized — caught only at TAB, after the duct is fabricated and hung.
Mitsubishi VRF restricts total piping to 1,000 ft equivalent length, with a 540 ft maximum from outdoor unit to farthest indoor unit. Each elbow adds 1.5 ft equivalent. A complex 18-zone system can blow past the limit if the takeoff measures actual length only — forcing a second outdoor unit costing $14,000-22,000.
VAV-3-12 on the floor plan, V3.12 on the equipment schedule, V-3-12 on the controls riser. Three different tag conventions for the same box. Manual estimators reconcile by hand and miss 2-4% of boxes; missed boxes cost $4,800-7,200 each delivered.
A 25-ton RTU schedule line says "with economizer and hinged panels" — but the spec section adds smoke detector, convenience outlet, isolation curb, BMS interface, and factory disconnect. Each accessory has a manufacturer part number and a 4-12 week lead time. Forgetting one is a change order; forgetting the curb is a roof penetration redesign.
AIM Act requires R-454B by 2025 for new equipment. A bid based on a 2024 spec calling for R-410A equipment must be respec'd at 8-15% material premium. Takeoffs that do not flag refrigerant designation per the AHRI directory leave that exposure on the contractor.
The line items that slip between plan sheets — and the dollars that leave with them.
Acoustic duct liner (typically 1" or 1.5" fiberglass) is shown only on the spec, not the plans. Missed liner on supply main and AHU plenum averages $3,800/floor in unbid material plus 20-30 hours of installation labor.
Replacement RTUs rarely match existing curb dimensions. Field-modified curbs at $850-1,400 per unit are bid as "stock" and absorbed by the contractor.
Spring isolators on AHUs and pumps required by spec, omitted from takeoff. Average per-project loss: $2,200 plus crane time for AHU re-set.
TAB labor at $185/hour averages 8% above bid on jobs without proper VAV-by-VAV scope definition. On a 100-VAV building, that is $9,400 of unbid commissioning.
The 2025 AIM Act refrigerant transition, ASHRAE 90.1-2022 adoption, and IECC 2024 envelope tightening have converged to make every HVAC bid a respec exercise. Combined with 22-32 week lead times on RTUs and chillers, the estimator who cannot lock equipment specs in 48 hours after RFP loses the bid before pricing. AI-driven takeoffs are now the only path to the bid pace the market demands.
HVAC takeoffs fail because sheet metal, equipment, and controls operate on fundamentally different measurement units. Ductwork is priced by the pound (gauge-dependent), equipment by each (with kitchen-sink accessory lists), refrigerant by linear foot, and controls by point count. Traditional estimators swivel between three spreadsheets and still forget the transition pieces.
Equipment schedules are the second major failure mode. A modern commercial plan might call for 22 VAV boxes, four rooftop units, an energy recovery ventilator, and a hydronic loop with three pumps. Each has a model number, voltage, CFM, and accessory kit. Copy one row wrong and you're short a unit at rough-in, or worse, you've priced a 230V unit for a 460V building.
SMACNA compliance adds a third layer. Hanger spacing, seams, reinforcement, and insulation thickness all vary by pressure class and duct size. Spreadsheets don't enforce these rules — Pilrs does, by applying SMACNA HVAC Duct Construction Standards automatically to every duct segment it extracts from your mechanical plans.
Pilrs reads mechanical plans — HVAC floor plans, equipment schedules, control diagrams, and refrigerant piping diagrams — and produces a complete material takeoff with SMACNA-compliant duct weights, equipment with accessory kits, refrigerant lineset lengths, and control wire pulls. Every system is cross-checked against the equipment schedule on your drawings to catch missing units.
Galvanized, stainless, and fiberglass duct quantified by SMACNA gauge with fittings, hangers, and seam allowances included.
AI matches plan callouts against the equipment schedule and flags mismatches before the estimate ships — no missing VAVs.
VRF, split, and VRV systems measured by actual routed length with elevation and branch tracking for proper sizing.
Upload existing ACCA calcs or let Pilrs flag rooms where the load calc appears inconsistent with plan geometry.
Thermostats, sensors, actuators, and DDC points counted with control wire lengths estimated by run.
Duct liner, wrap, and pipe insulation quantified by the square foot with thickness per the spec section.
From plan upload to verified estimate — purpose-built for hvac contractors.
HVAC plans, equipment schedules, control diagrams, and refrigerant piping diagrams. Spec sections are parsed for system requirements.
Ducts, equipment, piping, VAVs, and controls are identified and counted. SMACNA gauge is inferred from pressure class callouts.
Plan counts are reconciled against the equipment schedule. A mechanical estimator verifies duct weights and equipment specs.
Full bid package with duct weights by gauge, equipment by unit with accessories, refrigerant by foot, and labor hours.
Direct answers to the questions hvac estimators ask most.
Long-form guides with real waste factors, labor units, and bidding traps — written for working estimators.
How to measure, count, and quantify hvac scope without missing phantom items. Spec-to-drawing cross-checks, waste factors, and the common 2 percent errors that kill bids.
Labor units, burden, markup, and the real 2026 material pricing bands. Where new estimators underbid themselves and what experienced shops carry in contingency.
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