Overview

In this module, students will learn how to calculate the cost of HVAC materials and build assemblies that reflect real-world installation packages. Estimators must understand how material pricing fluctuates, how assemblies reduce guesswork, and how to work with suppliers for reliable numbers.

Learning Objectives

• Define individual HVAC material types and units of measure
• Build pre-defined material assemblies for common duct and piping installs
• Request and update vendor pricing
• Apply markups, tax, delivery, and waste to raw material costs
• Link assemblies to takeoff items for fast estimating

Common HVAC Materials by Category

• Sheet Metal: Straight duct, elbows, tees, reducers, end caps
• Flex Duct: Pre-insulated runs, connectors
• Accessories: Dampers, volume boxes, access doors
• Pipe & Fittings: Copper, PVC, insulation, valves, unions
• Equipment: Units, hangers, stands, vibration isolators
• Controls: Thermostats, actuators, sensors
• Fasteners & Supports: Hangers, strut, clamps, threaded rod

What is an Assembly?

An assembly is a bundle of materials and labor that gets reused across projects. For example:

• Example 1: 12x8 Duct Assembly = 1 LF duct + 1 hanger + insulation wrap
• Example 2: VAV Box Assembly = VAV unit + control box + flex duct + 2 GRDs

Assemblies simplify estimating by giving each component a set unit price. This is helpful in software and spreadsheets.

Vendor Pricing Strategy

• Establish a contact at key supply houses (sheet metal, pipe, controls)
• Request quarterly price updates and fixture/equipment sheets
• Use quote numbers in final proposals for backup
• Apply a material escalation factor (3–10%) when prices fluctuate

Applying Costs in Your Estimate

1. Pull totals from your takeoff sheet (LF of duct, # of VAVs, etc.)
2. Apply your cost per unit (via assembly or line item)
3. Add waste (typically 5–10%) depending on system type
4. Include delivery, tax, and escalation as needed
5. Review with field personnel for constructability feedback