OKLAHOMA PSI HVACR CONTRACTOR UNLIMITED

Reference Books
The following reference materials are allowed in the examination center:

• ACCA Ductulator (Duct Slide Rule), 
• International Mechanical Code, 2018 edition,  
• International Fuel Gas Code, 2018 edition
• Modern Refrigeration and Air Conditioning, 20th or 21st edition, OR Refrigeration & Air Conditioning Technology, Fifth Edition, 2005
• Manual N - Load Calculation for Small Commercial Buildings, Fifth Edition, 2008
• Mathematics for Plumbers and Pipefitters, Lee Smith, 8th Edition, 2013
• Code of Federal Regulations - 29 CFR Part 1926 (OSHA), with latest available amendments

PSI Candidate Information Bulletin

Additional books that are neither used in the development of the exam nor contain answers to all the related subject questions, but are allowed in the test area under the same physical conditions as the other books:

• NCCER Heating, Ventilating, and Air Conditioning Book 1, Book 2, Book 3. and Book 4.

Note: Highlighted and tabbed books ordered out of the state of Florida may take up to 5-7 business days to be shipped.

03/11/2026