Need to quickly prepare for the Hvac exam?
EMS HVAC contractor exam study guide.
Designed for procrastinators who have only a few days before taking the HVAC exam.
Begin studying in the next few minutes. Learn load calculations, duct design, mechanical and gas codes and contractor business and law
“So easy, a dog could learn it!”
“Even an old dog”
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“Guide to Passing the HVAC Contractor Exam”
Updated 2026
Hi Folks,
My name is John White, creator and owner of Energy Marketing Service (. As you can see from my photo below, I’m an old man, eighty years old, in fact. I have held a NC H1, H2 and H3 Class I license since 1970. These licenses cover residential, commercial and boiler hvac systems respectively. I have taught live hvac exam prep courses since 1986. In addition, I am an approved continuing education instructor for hvac and plumbing contractors. In 1988 I attended and was one of the first certified by ACCA to teach Manuals J and D through their EPIC program. Also, I have created the EMS HVAC load calculator. that produces an accurate load without all the cumbersome fat in other popular software.
My HVAC licensing prep course is based on the “International Mechanical and Fuel Gas Codes, ACCA’s Manuals J, D and N and NASCLA’s “Contractor’s Guide to Business and Project Management”.
My HVAC Exam prep course is designed to prepare you to correctly answer any question that can be tossed at you. Take a look at my practice exam. Don’t let questions like those discourage you. You do not need the knowledge of a mechanical engineer, accountant and mathematician to answer the questions. All you need is my course that teaches and explains the technical discipline needed to be a successful HVAC contractor that passes the exam the first try. See my explanation of R-values and U-values below
My assurance to you; if, within 8 weeks, you do not agree my course is 100% worth the price, just send me an email saying you want a refund. your money will be sent back to your account immediately. (Actually, you will know the value within your first hour of opening the course)
Wishing you the best,
John White
*My Guarantee
YOU WILL LEARN MORE FROM THIS COURSE THAN FROM ANY CLASSROOM COURSE AND YOU WILL PASS YOUR EXAM OR I WILL REFUND YOUR PURCHASE PRICE IMMEDIATELY. JUST SEND ME AN E-MAIL WITHIN 8 WEEKS OF YOUR PURCHASE AND SAY “GIMMIE MY MONEY BACK FOR THE HVAC COURSE”
Thanks for concidering this course, John White
Here’s my email address and phone number: energymarketingservice@gmail.com
252-943-1028
If you’re preparing for your HVAC licensing exam, forget everything you learned in the field. The Board is not concerned about your mechanical ability. It wants to know you have the knowledge to safely design and install an hvac system according to the minimum requirements of the Codes. To insure your customer does not wake up dead, you will get Code questions like the following:
1. Does an 80,000 btuh gas furnace installed in a 20′ x 18′ x 8′ high room require outside air? HELP
2. Calculate the required outdoor ventilation rate for a 1700 sq. ft. office using the estimated maximum occupant load? HELP
3. When installing a gas furnace, with an 18 ft. high chimney vent, should you select the 15 Ft. or 20 Ft. row, on the vent sizing charts? HELP
Also, to assure the Board you’re able to correctly size and design a system while operating a business in a legal and businesslike manner, you will be faced with questions like:
4. Calculate the velocity (fpm) of 800 cfm in an 8″ x 14″ duct. HELP
5. If R-19 insulation is added to a ceiling with a U-value of .05, what is the new R-value? New U-value? HELP
6. If you purchase a fixture for $1000 and wish to make 30% profit; what would your selling price be? Hint: the answer is not $1300. HELP
Since 1986 EMS has successfuly helped examinees pass the HVAC contractor exam. The “Guide to passing the HVAC Exam” covers:
- Mechanical Code,
- Fuel Gas Code.
- Manual J load calculations*
- Manual D duct design
- NASCLA business principles.
- Designed to assist you in understanding the tough stuff; the stuff examinees struggle with on the exam. For example: EMS has condensed the principles and content of Manual J from 627 pages to only 11 pages.
“Guide to Passing the HVAC Exam”
Look’n for an idea of what type of questions are on the HVAC licensing exam?
Think about it!
A self-study course that allows you to learn at your own pace, While a classroom course moves along at the pace of the instructor. Self-studying allows you to create your own learning enviroment. Study in a special quiet corner at a particular time of day. You can even watch a football game and study during commercials. Self-studying allows you to stop studying to research and investigate areas you may not quite understand
After spending hours in a cram course, listening to an instructor rushing to explain the provisions of all the code books, plus teaching you how to perform load calculations and size ducts, vents and piping and then covering business and accounting principles, the average attendee will come out of the class with one thought on his mine; “What did he say?” I know, as I have been on both sides. Believe me, the Guide is the way to go.
“I make learning easy”
Manuals J, N and D. Once you’ve completed our sections on load calculations and duct design you’ll be looking for a butt kicking machine for not ordering our course earlier. There is simply no easier method for fully understanding these manuals.
Because many states are now adding business questions to their HVAC exams, we have included a section on business practices and math. It is written in a language, we in the trade understand. You will not need the skills of a Philadelphia lawyer, mathematician or CPA to help prepare for the exam.
WHAT YOU WILL LEARN WITH MY GUIDE
- Manual J, 8th edition- Easy to understand procedures for calculating loads . Basic principles of heat transfer and thermodynamics. Operating cost calculations (Manual J is condensed from 627 pages to just 11 pages)
- Manual N– Once we get through Manual J, N will be a cakewalk.
- Manual D and Ductulator – “Three easy steps to duct sizing.”
- Symbols and Psychrometrics – How to read and use charts and calculate A/C capacity
- Mechanical Code– What to highlight and how to calculate ventilation and combustion air requirements, hood sizes and return air ducts, plus more
- Fuel Gas Code- What to highlight. Determining confined spaces, gas pipe sizes, vent sizes and clearances, plus more
- Business- Learn business equations and accounting principles. Find out how to figure profit the correct way.
- Energy Code– What you need to know to pass the exam.
- 150 Strategic Practice Questions– Answer these and you’ll surely pass
- Much, much more
THE GUIDE IS A PUBLICATION THAT WILL BE ELECTRONICALLY SENT TO YOUR COMPUTER IMMEDIATELY ONCE YOU PLACE YOUR ORDER (If you wish, you may order a hard copy below)
BELOW IS AN EXCERPT FROM THE GUIDE TAKEN FROM OUR SECTION ON MANUAL J (load calculations)
Also, note, the brick has an R- value of .11 per inch. Therefore the total R-value of the 4″ brick is 4″ x .11 = R .44
Taken from our section on the Fuel Gas Code
Using Table 504.2(1)
What size vent is needed for a 160,000 BTUH naturally ventilated appliance if the total vent height is 18’ and the lateral 2’?
Answer: 6”
Under the height column you have to choose either 15’ or 20’. Remember this, the taller the vent the more capacity it has, therefore, if the 20’ row is used the vent may be under sized. Always use the shorter height. In this case use 15’. Now use the 2’ lateral and select a vent size under NAT. A 5” vent will handle only 129,000 BTUH, while a 6” vent will handle 225,000 BTUH, therefore select a 6” vent.
See, you’re already learning something?
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Get all the courses needed to pass the exam
FOR ONE LOW PRICE
Mechanical Code Course Fuel Gas Code course Manual J Course Manual D Course Manual N Course Business Course Energy Code Course
Plus, get a 150+ question practice test that covers the entire gambit
Available as an immediate download or mailed to you as a printed and spiral bound hard copy
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Additional contact information
Call 252-943-1028 9:00am – 6:00 pm Mon-Fri
or CONTACT anytime by email:
energymarketingservice@gmail.com
EMS energy marketing service
353 Winfield Lane, Pinetown, NC 27865
Since 1986
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