Energy Marketing Service

          Since 1986



Question: 1 ton of refrigeration = ____ btu’s?

This is a Gotcha question.  A “ton of refrigeration” is defined as the amount of btu’s required to melt one US ton of ice  in 24 hours.

When we melt ice, we are in effect, changing the state of water from a solid to liquid,without changing the temperature. Energy required to change the state of a substance is called latent heat. When changing from a solid to a liquid, it is called latent heat of fussion. the latent heat of fussion is 144 btu’s per pound of water. Therefore, it takes 144 btu’s to melt one pound of water (ice). Two thousand  pounds  x 144 btu’s = 288,000 btu’s. If, you divide 288,000 by 12 hours, you will get the 12,000 btuh you were looking for. Nevertheless, it takes 288,000 btu’s to melt a ton of ice. Therefore, 1 ton of refrigeration = 288,000 btu’s

Want to know what to expect on your HVAC exam ? 

Check out our self-study course yourself, by clicking on the image below. It will bring you to excerpts of our  course, allowing you to decide the course’s worth-

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"Guide to Passing the HVAC Exam"

A Home Study HVAC Exam Prep Course

Developed by

Energy Marketing Service

We’ve been around since 1986


     Your HVAC licensing exam            isn’t that difficult. In fact,            I’m about to make it a lot              easier   

” Hi folks! Welcome to my website, where I have had the pleasure of helping over 4000 students get their air conditioning and heating contractor license. Please do yourself a favor and read through this site. Pay particular attention to my practice tests and course excerpts, as they will show you the stuff you’ll need to learn.

Thanks for stopping by,

John White

The“Guide to Passing the HVAC Licensing Exam” will have you prepared to take the exam for less than one half the cost of a classroom cram course. Learn the Mechanical Code, the Fuel Gas Code, plus, Business and Law, Manuals J, D and N.

Completely up-to-date, thru the 2021 IMC Codes

"Guide to Passing the HVAC Licensing Exam"

A comprehensive self study course with no expiration time

Also Includes Business/Law Exam Prep Course

Based on NASCLA’s “Contractors Guide to Business, Law and Project Management”

Don’t know where to begin?

Our course will guide you right through.

hvac book cover




This copyrighted HVAC licensing exam prep course teaches and explains the provisions of the Mechanical Code, Fuel Gas Code. Manuals J and N load calculations, Manual D duct design and business principles.  it is designed to assist you in understanding the tough stuff; the stuff many examinees struggle with on the exam.

The only All-in-One HVAC licensing exam course that will prepare you to be tested on:

Mechanical Code – Fuel Gas Code  
Manual J – Manual D – Manual N – Energy Code – Business 


✔  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, combustion air requirements

✔  Manual J, 8th edition- Load Calculations-We have reduced this manual from 627 pages to just 11 pages as an easy to understand procedure for calculating loads .  Basic principles of heat transfer and thermodynamics.  Operating cost calculations

✔  Manual N– Once we get through Manual J, N (commercial load calculations) will be a cakewalk.

✔  Manual D– “Three easy steps to duct sizing.” How to determine friction rate and room CFM.

✔  Symbols and Psychrometrics – How to read and use charts and calculate A/C capacity

✔  Business- Learn business equations and accounting principles.  Find out how to figure profit the correct way. Includes sample practice test.

✔  Energy Code– What you need to know to pass.

✔  150 Strategic Practice Questions– With answers and how we got’em

✔  Much, much more

Our course is based on the International Codes. Most states have adopted the International Codes, although they may bare the name of a state, such as New York State Mechanical Code or North Carolina Mechanical Code.

States colored in purple have adopted the International Mechanical and Fuel Gas Codes. Our course will definitely help you.

About your instructor

John White has been teaching plumbing and mechanical for over 40 years. He has a BSBA degree in Business Administration, holds an electrical, plumbing and HVAC licenses. He has taught at both, universities and community colleges, has presented seminars throughout the nation and has even created licensing exams like the one you are about to take. John sold his mechanical contracting business in 2006 to devote his energy to his consulting company, Energy Marketing Services, which develops and conducts plumbing and HVAC exam prep courses and is also an approved provider of continuing education.

Typical exam questions

1.   Where the minimum size combustion air duct is 6” X 12”, a metal louver with unknown free area, must be at least _______ square inches

2.  Calculate the required outdoor ventilation rate for a 1700 sq. ft. office space?

3.  When installing B-vent for a 120,000 BTUH gas furnace (fan assisted), what is the minimum diameter if the vent is 12 feet high with a 2 foot lateral?

4.  Calculate the velocity (FPM) of 800 CFM in an 8″ x 14″ duct.

5.  If R-19 insulation is added to a 1200 square foot ceiling with a U-value of .05, what is the new R-value? New U-value? Heat loss (BTUH) at 50 degree temperature difference?

6.  If you purchase an appliance for $1000 and wish to make 30% profit; what would your selling price be? Hint: the answer is not $1300


1. 96

2. 144.5 cfm

3. 5”

4. 1039 fpm

5. R=39, U=.025, 1500 btuh

6.  $1428.57

Learn how and why we got the answers with 

“Guide to Passing the HVAC Licensing  Exam

Think about it!

After spending hours in a cram course, listening to an instructor rushing through 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 question on his mind; “What did he say?”

Most of us have been there before.
The Guide is simply the best way to go.

We make learning easy.

Once you’ve read our sections on Manual J (load calculations) and Manual D (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. For example, the Guide condenses Manual J from 627 pages down to 11 pages; Now, that’s making it easy

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 no longer have to have the skills of a Philadelphia lawyer, mathematician and a CPA to help prepare for the exam. 

Pricing and ordering information

No need to wait for the mailman

The “Guide to Passing the HVAC Exam”  May be instantly downloaded to your computer as soon as your payment is verified.

All credit or debit cards are accepted.

You Will Pass or Your Money will be Refunded

Questions or concerns


contact us

Energy Marketing Service

Phone 252-943-1028 M-F 9:00AM-6:00pm

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