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California C-20 HVAC Contractor Study Guide

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Section 1 Official C-20 blueprint: Calculate component heating and cooling loads — Item 1 Preview

Preview: Planning and Estimating

Preview includes
  • 4 of 5 lesson topics
  • 1 overview segment
  • 3 core concepts
  • 2 exam tips

Lesson Topics

  • Envelope conduction
  • Core rule or formula
  • Scenario application
  • Common exam trap

Overview

Focus: Envelope conduction. Walls, ceilings, floors, and partitions are commonly tested with U × A × ΔT.

Core Concepts

  • Walls, ceilings, floors, and partitions are commonly tested with U × A × ΔT.
  • Use a room-by-room load method rather than rules of thumb when the applicable design standard requires it.
  • For steady conductive heat transfer, Q = U × A × ΔT; keep U-factor, area, and temperature-difference units consistent.

Exam Tips

  • Write the equation before inserting numbers.
  • Do not add or omit a load component just because it is small; follow the stated scope.
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Section 7 Official C-20 blueprint: Calculate required supply airflow from sensible load — Item 7 Pro
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Section 13 Official C-20 blueprint: Calculate ventilation airflow and fan quantity — Item 13 Pro
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Section 14 Official C-20 blueprint: Calculate ventilation airflow and fan quantity — Item 14 Pro
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Section 17 Official C-20 blueprint: Interpret psychrometric properties and processes — Item 17 Pro
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Section 21 Official C-20 blueprint: Apply load calculations and equipment selection methods — Item 21 Pro
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Section 22 Official C-20 blueprint: Apply load calculations and equipment selection methods — Item 22 Pro
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Section 27 Official C-20 blueprint: Design duct systems for required airflow and pressure — Item 27 Pro
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Section 33 Official C-20 blueprint: Calculate duct area from airflow and velocity — Item 33 Pro
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Section 39 Official C-20 blueprint: Calculate labor, material, overhead, and profit in an HVAC estimate — Item 39 Pro
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Section 45 Official C-20 blueprint: Fabricate and assemble duct systems — Item 45 Pro
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Section 57 Official C-20 blueprint: Install HVAC equipment according to code, listing, and manufacturer instructions — Item 57 Pro
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