SKU: TX_HVAC_Combined_EA_CR Category:


The Contractors School offers the only Complete 3-in-1 System consisting of:

(1) New Texas ACR Home Study Computer Program with 20 excellent sample exams with 80 questions in each module to simulate your actual PSI state exams ! 

(2) Weekend Seminar or Webinar !

(3) Engineering tutoring help !

This Home Study Computer Program is a three (3) month subscription / enrollment and allows for unlimited Home Study, Seminars, and Tutoring for a three (3) month period !

Our sample exams simulate your actual PSI state exams! 

Questions, answers, and article references that you need to pass the new PSI state examination are contained in this new module. Choose this program if you are serious about passing your state exam with PSI. Go into the test prepared with the best computer study program in Texas!


Below is a small sample of our exam prep questions:

(1)  Using the duct size calculator provided, and based on the effect of compression of the flexible duct on the air flow efficiency, what would be the approximate CFM air quantity given the following variables?

      • 15% compression
      • 10-inch flexible duct
      • 0.1 friction loss.

ADI Duct Size Calculator – 200 CFM

(2)  Understanding the refrigerating effect of melting ice and changing state to water, calculate the amount to heat in BTUs given a five (5) pound block of ice that is frozen stable at 32 degrees F, and is to be heated to a hot temperature of 82 degrees F. How many BTUs would be required?          

Modern Refrigeration and Air Conditioning – “refrigerating effect of ice”. Steps to solve are shown below:

      • Step_1: Not a required step, as the block is not below freezing temperature of 32.
      • Step_2: BTU = Weight of Ice x Latent heat of fusion of Ice = 5 pounds x 144 BTUs/pound = 720 BTUs.
      • Step_3: BTU = Weight of Water x Specific Heat of Water x Temperature change = 5 pounds x 1.0 x 50 degrees F (82-32) = 250 BTUs.
      • Step_4: Finally, sum of the sub-totals = 720 + 250 = 970 BTUs

(3)  Incandescent lights produce a significant larger amount of heat than LED (light emitting diodes) lights. A 20 W LED produces 68 Btu/hr. How many Btu’s does a 100 W incandescent light produce per hour?

      • Modern Refrigeration and Air Conditioning 2017 – 50.1.2, Heat from Lights is 1 W = 3.41 Btu/hr. Therefore, calculate the load = 100-watt x 3.41 Btu/hr = 341 Btu per hour


Sample questions from every code book required to pass your state exam are included with our preparation software!

Our Home Study Computer Program running on your PC.

The following reference materials are allowed in the examination center

Business and Law Reference List:

    • Texas Air Conditioning and Refrigeration Contractors Law 
    • Texas Air Conditioning and Refrigeration Administrative Rules 
    • OSHA CFR 29 Parts; 1904-Record keeping, 1910-General Industry, 1926-Construction. 
    • IRS Publication 15 (Circular E)

Technical Reference List:

    • Modern Refrigeration and Air Conditioning 21st Edition
    • ADI Duct Size Calculator

Code Reference List:

    • International Mechanical Code – 2018 Edition
    • International Fuel Gas Code – 2018 Edition
    • Uniform Mechanical Code – 2018 Edition

The following three references are used for Environmental Air (not Commercial Refrigeration) examinations only:

    • Manual D – Residential Duct Systems, 2014 Edition
    • Manual J – Residential Load Calculation, 2011 Edition
    • Manual S – Residential Equipment Selection, 2014 Edition

Important Notes:

    • Reference materials may be highlighted, underlined and/or indexed prior to the examination session, and notes are permitted prior to the exam session.


License Requirements Summary:

    • Class A: 120 question exam, 230 minutes time limit, minimum test score 70%
    • Class B: 100 question exam, 170 minutes hour time limit, minimum test score 70%
    • State Application Fee = $115
    • Class A: PSI Test Fee = $74
    • Class B: PSI Test Fee =$60
    • Experience requirement: Your employment history must indicate at least 48 months (4 years) of practical experience with the tools of the trade in the preceding (6) years.


License Definition Summary:

License numbers will have the following form:

Title/Class/Number/Endorsement code – TACL/A/000000/C for a “Class A Combined Endorsement Contractor”. Endorsement codes are as follows:
(C) Combined Endorsement
(E) Environmental Air Conditioning
(R) Commercial Refrigeration and Process Cooling or Heating

Frequently Asked Questions:

(1) What is the difference between “Environmental Air Conditioning” and “Commercial Refrigeration/Process Heating and Cooling”?

        • “Environmental Air Conditioning” means treating air to control temperature, humidity, cleanliness, ventilation, and circulation to meet human comfort requirements. Includes central air conditioning and heating.
        • “Commercial Refrigeration/Process Heating and Cooling” is limited to coolers, freezers, ice machines, and equipment that provides temperature and humidity controls.

(2) What is the difference between a Class A and a Class B license?

        • Class A allows you to work on any size unit.
        • Class B allows you to work on cooling systems of 25 tons and under, and heating systems of 1.5 million BTUs/hour and under.


Applications must be submitted to Texas Department of Licensing and Regulation TLDR online or at:

P.O. Box 12157
Austin, Texas 78711
Telephone: (512) 463-6599
Toll-Free (in Texas): (800) 803-9202
Relay Texas-TDD: (800) 735-2989

    • License candidates must be pre-approved by Texas Department of Licensing and Regulation prior to testing with PSI.
    • Applications submitted to TDLR are usually processed in 2-3 weeks, at which time TDLR will mail each license candidate a letter or postcard to indicate approval to take the examination with the testing agency PSI.

Examinations are administered by the testing agency PSI Services LLC:

Telephone: (800) 733-9267


Our interactive Exam Prep Program allows each license candidate to prepare and study for his state examination while in the comfort of his own home. Our practice exams actually simulate the experience of taking the computerized state examination. The questions, multiple choice answers, and article references have been professionally prepared by our research team to cover every subject area, code section, and calculations. Our sample tests questions are scrambled each time you test to simulate your actual state test experience.


This excellent program can be purchased and installed in just minutes, allows unlimited study and review time for a three month period, and runs on any Windows or Mac computer with an operating system. The program will run on your laptop without internet access allowing on-the-go study preparation.

Click ADD TO CART at the top of this page to begin your studies today!