Prerequisites

What You Need Before You Start

Required: - You own, rent, or are considering purchasing a residential home - Basic reading comprehension - Willingness to occasionally look at your house with fresh eyes

Genuinely not required: - Any prior knowledge of construction, engineering, or the trades - Math beyond arithmetic (a few chapters involve simple calculations, all of which are explained step by step) - Tools (though some exercises invite you to use a flashlight, a tape measure, or a multimeter) - Previous home repair experience

Technical Prerequisites by Section

This book is designed so that readers with no technical background can follow everything. However, a few sections build on earlier material:

Part 3 (Electrical) is easier to follow after reading Part 1, Section 1.1 (Structure vs. Systems) and Chapter 12 (Electricity Basics). If electrical systems are new to you, read Chapter 12 before the others in Part 3.

Part 4 (HVAC) is easier to follow after Part 1. Chapter 18 (Heating) is the foundation for all of Part 4.

Part 5 (Roof and Exterior) and Part 6 (Interior) are largely self-contained and can be read in any order.

Part 8 (Contractors) is most useful after you've read the chapters relevant to whatever work you're planning.

Appendix E (Glossary) is always available as a reference when you encounter unfamiliar terms.

A Note on Math

Several chapters involve simple calculations:

  • R-values and insulation (Chapter 4): Addition and multiplication
  • Electrical load calculations (Chapter 13): Multiplication and comparison
  • HVAC efficiency and costs (Chapter 23): Division and percentage
  • Energy payback periods (Chapters 17, 23): Division

All calculations are shown step by step with explanations of what each number means. If you're comfortable with a calculator and basic arithmetic, you'll have no trouble.

Tools for the Exercises

Some exercises invite you to inspect your own home. Here's what's helpful:

Already in most homes: - Flashlight (or phone flashlight) - Tape measure - Pen and paper (for a home inspection notepad)

Worth having: - Non-contact voltage tester ($15–$25) — Chapter 12 and 14 exercises - Digital thermometer ($10–$20) — Chapter 4, 18, and 22 exercises - Outlet tester ($5–$15) — Chapter 14 and 16 exercises - Water pressure gauge ($10–$20) — Chapter 6 exercises

Optional for the curious: - Multimeter ($25–$60) — Chapter 12, 13 exercises - Thermal imaging app or camera — Chapter 4 exercises

None of these tools are required to read and understand the book. They're useful if you want to apply what you learn to your actual home.