Vocations · Trades & Technical

Heating and cooling work,
from the first class to the first job.

Compare the four ways into HVAC work, learn which EPA refrigerant certification each kind of job needs by sorting real situations, practice the arithmetic technicians use every day, and leave with a plan you can print.

Start exploringWhat you get

The pathway explorer

Four parts, in any order. Your answers, practice record and plan are saved in this browser only. Show a sample of saved progress to see how a filled-in plan looks.

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What you get

Vocations · Trades & TechnicalFree

What you finish with
A side-by-side picture of the four routes into the trade, with time, pay while learning and where each leads; working knowledge of which EPA Section 608 type covers which job, from twelve real situations with the reason for each; practice with worked solutions on tons and BTU per hour, the sensible heat formula, Ohm’s law, power, temperature conversion, superheat and subcooling; and a printed plan of steps from high school to the first job, with your notes.
Who it is for
Middle and high school students curious about the trades, adults weighing a career change, the families helping them decide, and career and technical education teachers and school counselors who want a classroom activity.
Format
Browser tool in four parts. Works on a phone, tablet or computer. Prints a one-page plan; export and import a file of your progress.
Access
Free. No account, no sign-in and nothing to install. Everything you type stays in this browser; nothing is sent to Caveat.
Where it lives
The Trades & Technical space in Caveat Vocations.
Support
Questions, a correction or a request: team@caveatacademic.com.

How to use it

  1. Start with Routes in and mark the route you lean toward.
  2. Work through the EPA 608 sorter: pick the certification for each job, then read why.
  3. Pick a kind of problem in Shop math, answer it, and read the worked solution. New problems are generated each time.
  4. Tick off what you have done in My plan and add notes: programs to visit, people to ask.
  5. Print the plan and take it to a counselor, a teacher or a program you are visiting.

Start exploring

The facts behind the explorer

Federal refrigerant rules, apprenticeship standards and the trade’s formulas, in general terms.

1 Which EPA 608 type: by the applianceType ISmall appliancessealed, 5 lb or lessType IIHigh pressuresplit systems, rooftopType IIILow pressureR-123, R-11 chillers2 The test: Core plus each typeEach section25 questionspass 18 (70%) when proctoredUniversalCore + I + II + IIInever expires once passed3 Two formulas the trade uses dailyCapacity1 ton = 12,000 BTU/h3.5 tons = 42,000 BTU/hSensible heatQ = 1.08 × CFM × ΔT1,200 CFM, 20°F → 25,9201 EPA 608, by applianceType ISmallsealed, 5 lb or lessType IIHigh pressuresplit, rooftopType IIILow pressurechillers on R-123 or R-112 The testEach section25 questions18 to pass, proctoredUniversalAll fournever expires3 Two formulasCapacity1 ton= 12,000 BTU/hSensible heat1.08×CFM×ΔT1,200 CFM, 20°F
Section 608 certification follows the kind of appliance, the test is a Core section plus one section per type, and two formulas, tons to BTU per hour and the sensible heat equation, run through everyday service work.

EPA Section 608

Under Section 608 of the Clean Air Act, anyone who maintains, services, repairs or disposes of equipment that could release refrigerant must be certified, and it is illegal to knowingly vent refrigerant, including HFC substitutes. Type I covers small appliances (factory-made, charged and hermetically sealed with five pounds or less), Type II high-pressure appliances and Type III low-pressure appliances; Universal is all three. The test has a Core section and one section per type, 25 questions each; a proctored section passes with 18 right (70 percent), and Type I can also be taken unproctored with a higher pass mark of 84 percent. Certification does not expire. Car and truck air conditioning falls under Section 609 instead. New home air conditioners are moving to lower-global-warming refrigerants such as R-454B and R-32 under the EPA’s HFC rules; these are mildly flammable (class A2L) and need their own handling training.

Apprenticeship, safety and the math

Registered apprenticeships are approved by the U.S. Department of Labor or a state apprenticeship agency; federal standards call for at least 2,000 hours of on-the-job learning in a time-based program and recommend at least 144 hours a year of related instruction. HVAC apprenticeships commonly run three to five years. Licensing of technicians and contractors is set by states and cities and differs widely; the page makes no claim about any one place. The formulas are standard: one ton of cooling is 12,000 BTU per hour; sensible heat is 1.08 × CFM × ΔT for standard air; Ohm’s law is V = I × R and power P = V × I; superheat and subcooling are differences between a line temperature and the saturation temperature.

Sources

  1. U.S. Environmental Protection Agency. Section 608 Technician Certification and Requirements for Technicians (epa.gov/section608); 40 CFR Part 82, Subpart F.
  2. U.S. Environmental Protection Agency. Section 609 Technician Training and Certification Programs for motor vehicle air conditioning.
  3. U.S. Environmental Protection Agency. Technology Transitions rule under the AIM Act (2023), limits on HFCs in new residential and light commercial air conditioning.
  4. U.S. Department of Labor. 29 CFR Part 29, Labor Standards for the Registration of Apprenticeship Programs (§ 29.5); apprenticeship.gov.
  5. U.S. Bureau of Labor Statistics. Occupational Outlook Handbook: Heating, Air Conditioning, and Refrigeration Mechanics and Installers, for current pay and job outlook.
  6. Occupational Safety and Health Administration. 29 CFR 1910.147, The control of hazardous energy (lockout/tagout); OSHA Outreach Training Program.

This page teaches; it is not a certification course or exam and does not replace hands-on training. Licensing rules differ by state and city. Pay and job numbers change each year; see the Bureau of Labor Statistics for current figures. Your progress stays in this browser. Support: team@caveatacademic.com.