National Credential
Credential: Air Conditioning Service  GI Bill resource
Credentialing Agency: North American Technician Excellence (NATE)

North American Technician Excellence (NATE), Air Conditioning Service is designed for top level service technicians in the HVAC industry. Air Conditioning Service applicants should have knowledge of the installation, service, maintenance, and repair of HVAC systems that are limited to 30 tons or less cooling capacity. It is recommended that applicants have two years of field experience working on air conditioning systems as a service technician and technical training for theoretical knowledge. To earn the Air Conditioning Service certification, applicants must pass both a Core exam and an Air Conditioning Service exam. Technicians that earn the Air Conditioning Service certification are also awarded the Air Conditioning Installation certification. The Air Conditioning Service certification is not intended for the HVAC system designer, sales force, or the engineering community.

More information can be found on the certifying agency's website.

Renewal Period: 2 years

Air Conditioning Service

The following Army Occupations provide training and/or experience that contributes to attaining this credential:

Personnel Category Occupation Occupation Type Related As Promotion Points Skill Level Star Proponent Funded Gap Analysis
Enlisted 91C Utilities Equipment Repairer MOS most  Promotion Points: This certification has been approved for promotion points. Click for more information. II Star credentialStar    

Army Table Legend


Related As

The military occupations shown in this table are related to this credential in one of four ways: Most, Some, or Other.

Most: This credential is directly related to most of the major duties associated with the military occupation (at least 80%). Note that the credential may require additional education, training or experience before you are eligible for it.

Some: This credential is related to some tasks associated with the duties of the military occupation (related 80% to at least one or more critical tasks but less than 80% of all of the entire military occupation). Note that the credential may require additional education, training or experience before you are eligible for it.

Other: This credential is related to this military occupation, but is more advanced or specialized and therefore will likely require additional education, training, or experience.

Promotion Points Promotion Points icon

This credential has been approved for promotion points for this MOS towards promotion to Sergeant and Staff Sergeant. Clicking the Promotion Points icon will open a link to the promotion points fact sheet.

Skill Level Designation

Skill Level I: This skill level consists of all Soldiers in the ranks of Private (pay grade E-1) up to Specialist (pay grade E-4). Time in Service (TIS) is generally between initial entry and four Years of Service (YOS). This skill level is Entry-level positions requiring performance of tasks under direct supervision.

Institutional training:

  • Structured Self-Development (SSD) level I
  • Basic Leader Course (BLC)

Skill Level II: This skill level is obtained when promoted to Sergeant (paygrade E-5). TIS is generally between 4-8 YOS. Positions requiring performance of more difficult tasks under general supervision; and in some instances, involving supervision of Soldiers in SL1.

Institutional training:

  • Structured Self-Development (SSD) level II
  • Advance Leader Course (ALC)

Skill Level III: This skill level is obtained when promoted to Staff Sergeant (paygrade E-6). TIS is generally between 8-12 YOS. Positions requiring performance of still more difficult tasks and involving first line supervision of Soldiers in SL1 & SL2.

Institutional training:

  • Senior Leader Course (SLC)
  • Structured Self-Development (SSD) level III

Skill level IV: This skill level is obtained when promoted to the rank of Sergeant First Class (paygrade E-7). TIS is generally between 12-18 YOS. Positions requiring relatively detailed knowledge of all tasks specified for a given MOS, normally involving first-line supervision of Soldiers in SLs 1, 2, and 3, and involving managerial duties.

Institutional training:

  • Master Leader Course (MLC)
  • Structured Self-Development (SSD) level IV
  • Senior Enlisted Joint Professional Military Education (SEJPME) I Course

Skill level V: This skill level is obtained when promoted to the rank of Master Sergeant (paygrade E-8). TIS is generally between 18-22 YOS. Positions requiring direct and indirect leadership roles with expertise in company and battalion-level operations and competency across a given CMF, serving as members of a staff at every level in the Army, with a full understanding of the allocation of resources and their utilization in order to accomplish Army functions and missions.

Institutional training:

  • United States Army Sergeants Major Academy (USASMA)
  • Structured Self-Development (SSD) level V

Skill level VI: This skill level is obtained when promoted to the rank of Sergeants Major (paygrade E-9). TIS is generally between 22-30 YOS. Positions requiring organizational leadership roles with multi-dimensional expertise in units and teams on division, corps, and Army staffs, integrated with Joint, Interagency, Intergovernmental, and Multinational (JIIM) partners with a full understanding of the Force Generation process, operations at all echelons, and how the Army runs.

Star Credential Star icon

Star credentials are MOS enhancing, as designated by the Proponent. MOS enhancing credentials are directly related to an MOS or ASI, are taught either partially or completely as part of a Program of Instruction (POI), and improve the MOS technical proficiency.

Proponent Funded Funded icon

This icon indicates credentials which Soldiers may have funded through their MOS proponent. Some proponents offer credentialing opportunities in conjunction with military training and/or as part of MOS development beyond the training base.

Gap Analysis Has Analysis icon

A detailed analysis comparing the credential requirements to the military occupation has been completed. Click on the gap analysis icon to view the analysis page.

Air Conditioning Service

Eligibility Requirements ()

Note: This credential may have multiple options for becoming eligible. Listed below are the minimum requirements based on the minimum degree required. To view other options, see the Eligibility tab.

  • Credential Prerequisite
  • Experience: 2 years recommended
  • Education
  • Training: Recommended
  • Membership
  • Other
  • Fee

Exam Requirements ()

  • Written Exam
  • Oral Exam
  • Practical Exam
  • Performance Assessment

Renewal Period: 2 years

  • Continuing Education
  • Exam
  • Continuing Education OR Exam
  • Fee
  • Other

North American Technician Excellence (NATE)
2111 Wilson Blvd.
Suite 510
Arlington, VA  22201
Phone: (877) 420-NATE
Email: asknate@natex.org

Air Conditioning Service

  • Safety (18%)
    • Complying with Government Regulations
    • Personal Safety and Work Practices
    • Personal Safety Around Moving Machinery
    • Electrical Safety
    • Safety Brazing and Soldering Practices
    • Safe Handling of Containers
    • Understanding Hazmat
  • Tools (10%)
    • Tools
    • Tubing Tools
  • Basic Construction (8%)
    • Plans and Specifications
    • Plumbing (Piping) Layouts
    • Room Specs - Clear Span and Ceiling Heights
    • Roofing
    • Ceilings
    • Walls
    • Floors
    • Fenestration
    • Girders and Trusses
    • Chimneys
  • Using Basic Science (10%)
    • Chemistry Basics
    • Electrons in Electricity
    • Electrical Basic Terms
    • Magnetism
    • AC and DC Circuits
    • Basic Circuit Analysis
    • Electricity - Generation and Distribution
    • Solid State Electronics
    • Pressure Measurements
    • Mathematics
    • Mechanics
    • Gas Laws
    • Electrical Load Types
    • Power
  • Achieving Desired Conditions (14%)
    • Temperature
    • Humidity
    • Air Quality
    • Sound
  • Taking Temperature and Humidity Measurements (14%)
    • Physical Measurements - Temperature and Heat
    • Thermometers
    • Humidity Measurement Calculations
  • Basic Electricity (26%)
    • Symbols
    • Field Wiring Diagrams
    • Pictorial Diagrams
    • Schematic (Ladder) Diagrams
    • Single Phase Motors
    • Three Phase Motors
    • Variable Speed Motors
    • Actuator Motors
    • Digital Electrical Meters
  • Installation (15%)
    • Fabricating Copper Tubing
    • Installing Condensing Unit
    • Installing Packaged Units
    • Installing Indoor Equipment
    • Evacuation and Charging
    • Duct Installation
    • Installing Accessories
    • Field Wiring
    • Start-up and Checkout
    • Refrigerant Circuit Tools
    • Recovery/Recycling Machines
    • Airflow Measurements
  • Service (45%)
    • Planned Maintenance
    • Diagnostics
    • Overview of Electrical Troubleshooting
    • Retrofitting
    • Air Balancing
    • Basic HVAC System Analysis
    • Analyzing Reported Symptoms in Cooling
  • System Components (25%)
    • Introduction to Systems
    • Duct Systems
    • Wiring Layouts
    • Components
    • Electromechanical Sensing Controls
    • Refrigerant Circuit Controls
    • Non-Sensing Controls
    • Electronic Controls
  • Applied Knowledge (15%)
    • Air Quality Regulations
    • Electrical Code
    • State and Local Regulations and Codes
    • Fire Protection Regulations and Codes
    • Design Considerations - Comfort
    • Design Considerations - Components
    • Design Considerations - Residential and Light Commercial
    • Mechanical Code
    • Industry Standards
    • Bids and Proposals

There are a number of resources available to help you prepare for the Air Conditioning Service examination:

An additional resource is Safari Books Online, a searchable digital library that provides online access to thousands of books, training videos and conference sessions. See the Educational Resources page here on COOL to learn how to get free access.

Air Conditioning Service

Renewal Period: 2 years

The Air Conditioning Service credential has the following recertification information:

  • The Air Conditioning Service certification is renewed every two years. Certification holders must complete 16 continuing education hours (CEHs), submit the application for recertification, and pay a recertification fee or retake the Air Conditioning Service exam and pay applicable testing fees before the certification lapses. 

    Additional information can be found on the NATE website.

Air Conditioning Service

Additional considerations for the Air Conditioning Service include:

  • There are no educational or work experience requirements, yet NATE strongly recommends that applicants have some formal training provided by an employer, a technical school or other educational institution and two years of experience before taking the required exams.