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Field Notes

Field Notes

HVAC field guides for real service calls.

Practical HVAC troubleshooting guides, airflow diagnostics, duct sizing walkthroughs, and estimate strategies for technicians working in the field.

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Latest guides

Start with these HVAC field notes.

Browse practical guides for troubleshooting, airflow diagnostics, duct sizing, static pressure, and service-call decision support.

01

AC not cooling but the fan is running?

If your AC is not cooling but the fan is running, this guide explains common causes and how HVAC technicians diagnose the issue.

02

Why is my AC freezing up?

Learn why an AC freezes up, the most common causes, and how HVAC technicians diagnose airflow and refrigerant issues in the field.

03

What should static pressure be in HVAC systems?

Learn what static pressure should be in HVAC systems, how to measure it, and what high readings mean for airflow and performance.

04

How to measure airflow in HVAC systems

Learn how HVAC technicians measure airflow using static pressure, CFM targets, and field diagnostic tools.

05

How to size ductwork correctly

Learn how to size ductwork correctly using airflow requirements, static pressure, friction rate, and practical HVAC design principles.

06

How to estimate HVAC jobs in the field

Learn how to estimate HVAC jobs in the field, including labor, parts, diagnostics, airflow issues, and repair or replacement quote strategy.

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