Lesson 1. HVAC Training, What is HVACR?

HVAC Training, What is HVACR?

The acronym HVACR stands for Heating, Ventilating, Air Conditioning and Refrigeration. HVAC usually precedes segments of the business such as HVAC Service or HVAC Training. Another common description used is Mechanical Service or Mechanical Contractor. Refrigeration Service defines the non-comfort cooling/freezing segments of the business.

HVAC is concerned with comfort inside buildings. Refrigeration is associated with lower temperature applications of similar technology to cool / freeze food, ice or other products. This HVAC Training section will focus primarily on the HVAC segment of the industry defining the environment inside a building.

Another acronym associated with the HVAC industry is ASRHAE. This represents the American Society of Heating, Refrigerating and Air-Conditioning Engineers. ASRAHE is a professional organization of degreed engineers that specializes in HVAC engineering

Through research, the engineers that comprise ASRHAE determined that most people are comfortable between 72F and 77F degrees, depending on the outside temperature or season. The humidity in the air and the speed of the air as it crosses over your skin also has a significant effect on comfort. It’s the job of the HVAC business to make sure these factors are maintained within the narrow range of comfort, for most humans.

As with many technical industries, the HVAC business has many acronyms that represent the technical terms unique to the industry. Don’t fight it; jump in and become familiar with these terms. Review the terms and definitions in the Terms chapter of this book. With repetition you will come to understand their meaning and use. You must learn the lingo.

What should a modern HVAC System Accomplish?

  • Regulate air temperature
  • Regulate air humidity
  • Regulate and circulate indoor air
  • Regulate and provide fresh air
  • Filter contaminants from the air
  • Provide the above using energy efficiently

HVAC Service providers perform varying levels of services. Most companies are specialized. A small number of companies provide services in all segments. Specialized HVAC Training is provided by these companies. These services may include:


  • Residential equipment manufacturers
  • System design, residential
  • Construction, residential
  • Maintenance and service repair, residential


  • Commercial equipment manufacturer
  • Commercial systems design
  • Commercial construction
  • Commercial maintenance and service repair

Commercial service providers are additionally segmented in areas of specialization:

  • Small commercial, split units and small package rooftop units (RTU)
  • Applied systems such as chill water or boiler systems
  • Special health care systems
  • Ventilation
  • Data centers
  • Etc.

This is a good time to review the terminology section as part of your HVAC Training.


  1. Michael Glover says:

    Check iHeatCool.com

  2. Jim Rohlman says:

    I am looking for written or DVD material that would detail the maintenance required for a RTU. Including measuring suction and discharge pressure of compressors, crank case heater operation, economizer and damper operation, thermostat contron sequence, measuring voltage drops across compressor and fan contacts, verify heat exchanger integrity to name a few checkpoints. Also filter and belt changes and cleaning evaporator and condenser coils. Is this something you can help me with?

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