Field guides
HVAC Field Guides
Short, practical explanations of the measurements and sequences used on real service calls — and the books that cover each one in full.
- How to Troubleshoot an HVAC System, Step by Step
The order you check things in decides how long the call takes. Here is the sequence that keeps you from chasing the wrong fault.
Read the guide - Static Pressure in HVAC: How to Measure TESP and Read It
Total external static pressure is the single fastest measurement for telling you whether a system can move the air it was designed to move.
Read the guide - CFM per Ton: How Much Airflow a System Actually Needs
400 CFM per ton is where the conversation starts, not where it ends. The right target depends on climate, coil and what the system is being asked to do.
Read the guide - HVAC Electrical Troubleshooting: Reading a Wiring Diagram
A wiring diagram is a map of where voltage is supposed to be. Troubleshooting is finding the first place it is not.
Read the guide - HVAC for Beginners: What to Learn First
The trade is learnable in a sequence. Trying to learn it in the order the jobs arrive is what makes it feel impossible.
Read the guide - Superheat vs Subcooling: When to Use Each
Two readings, two different questions. Using the wrong one is how correctly charged systems end up overcharged.
Read the guide - AC Running but Not Cooling: What to Check, In Order
A system that runs without cooling is rarely a mystery. It is almost always airflow, charge, or load — checked in that order.
Read the guide - HVAC Troubleshooting Topic Hub
Troubleshooting, airflow diagnostics and electrical troubleshooting — every guide and book series organized by topic.
- Hot Work Series Reading Order
All eight volumes of the romance series in story order, including the Spanish editions.
Español
The same field methods are published separately in Spanish, written for Spanish-speaking technicians working in the United States.
Guías HVAC en Español