HI HVAC study guide
HI HVAC · Work through your exam, one topic at a time.
The HI HVAC credential is a professional certification for heating, ventilation, and air conditioning practitioners who want formal recognition of their technical knowledge. It is aimed at technicians, installers, service personnel, and maintenance staff who work on residential and light commercial systems, as well as those preparing to move into more senior or supervisory roles. The HI HVAC study guide has 6 sections and about 2,405 words.
01Heating Fundamentals and Equipment
The Heating Fundamentals and Equipment domain tests heat production, combustion, efficiency ratings, and the airflow that moves heat into the conditioned space. In Hawaii most heating work is commercial or at higher elevation, but the exam still uses standard mainland fundamentals, so do not skip gas, electric, hydronic, or heat-pump basics.
432 words, about 2 min02Ventilation and Indoor Air Quality
The Ventilation and Indoor Air Quality domain tests whole-house ventilation rates, local exhaust, filtration, pressure balance, and moisture control. In Hawaii's humid marine climate, latent control and mold prevention matter as much as pollutant removal, so the exam expects you to calculate ventilation and recognize when a system is fighting humidity.
401 words, about 2 min03Air Conditioning and Refrigeration Principles
The Air Conditioning and Refrigeration Principles domain tests the vapor-compression cycle, pressure–temperature relationships, charging, efficiency ratings, and the psychrometrics that explain sensible and latent capacity. Expect questions that make you read a PT chart and interpret superheat or subcool.
411 words, about 2 min04Ductwork, Piping, and System Components
This domain tests duct sizing, equivalent length, static pressure, refrigerant piping, evacuation, condensate management, and the function of major system components. Expect calculation questions on friction rate and practical questions on why a system loses capacity.
394 words, about 2 min05Controls, Electrical, and Troubleshooting
This domain tests low-voltage control circuits, thermostat signals, electrical measurements, safety devices, and a logical troubleshooting sequence. The exam favors questions that ask what to check first or how to interpret a meter reading.
389 words, about 2 min06Codes, Safety, and Load Calculations
This domain tests load calculation, equipment selection, code principles, refrigerant safety, and jobsite safety. The exam expects you to know that sizing starts with a calculated load, not a rule of thumb, and that code compliance depends on the adopted edition and local amendments.
378 words, about 2 min