HVAC Estimator Cheat Page
Learn the Basics of Plan Reading & Estimating
1. Understanding HVAC Plans
- M Sheets (Mechanical): Main reference for ductwork, equipment, air devices, and piping.
- A Sheets: Coordinate ceiling heights, locations for grills/registers, and access panels.
- Schedules: Equipment, diffusers, and register schedules define types and capacities.
- Section & Detail Views: Help determine duct heights and routing clearance.
- Mechanical Notes: Always review general notes for scope and spec compliance.
Highlight duct mains vs. branches using different colors during takeoff!
2. Takeoff Basics
- Start with duct mains, then move to branches and diffusers.
- Record duct size, type, and linear feet — separate by gauge if needed.
- Count fittings: elbows, reducers, transitions, taps.
- Log equipment: RTUs, AHUs, exhaust fans, etc.
- Include accessories: dampers, flex, hangers, and curbs.
Use the riser or isometric to verify vertical runs and roof penetrations.
3. Manhour & Labor Estimating
- Rectangular Duct (22GA): ~0.35 hr/ft
- Spiral Duct: ~0.20 hr/ft
- Flex Duct: ~0.10 hr/ft
- Diffusers/Registers: 0.5–0.75 hrs each
- RTUs/Fans: 4–8 hrs depending on size and curb
Break labor into categories: ductwork, accessories, equipment — and total separately!
4. Building the Estimate
- Material Cost: Calculate per duct type, fittings, insulation, grills, and equipment.
- Labor Cost: Total manhours × labor rate (e.g., $85/hr)
- Sections: Ductwork, Equipment, Air Distribution, Piping
- Overhead & Profit: Add percentage based on company standard
- Final Total: Material + Labor + OH&P
Use prebuilt assemblies for duct accessories like VAVs, volume dampers, and flex drops.
5. Downloadable Tools
- 📥 Duct Labor Chart (PDF)
- 📥 Equipment Labor Chart (PDF)
- 📥 HVAC Takeoff Template (Excel)
- 📥 HVAC Estimating Sheet (Excel)
- 📥 HVAC Symbols Legend (PDF)
Use our takeoff templates to train new estimators and speed up your workflow!