Connecticut Limited Heating & Cooling Contractor (S-9) Exam Book Package

Prepare for the Connecticut Limited Heating & Cooling Contractor (S-9) examination with a comprehensive collection of approved exam-room references and recommended technical study books. This package supports candidates reviewing heating systems, cooling equipment, refrigeration, fuel gas, oil burners, hydronics, duct construction, load calculations, ventilation, workplace safety, controls, and related HVAC trade knowledge.

The S-9 examination covers a broad range of heating and cooling subjects. Candidates must be prepared to work with codebooks, technical manuals, federal safety regulations, calculation tools, and industry standards. The exam also requires the ability to identify which reference applies to a question and locate the relevant provision, table, formula, or technical principle within the testing period.

This package combines references for residential and mechanical codes, heating and cooling load calculations, refrigeration systems, duct design and construction, oil-burning equipment, natural gas, LP-Gas, OSHA construction safety, hydronic heating, piping, and burner service. The collection supports both code-based study and practical trade review.

The approved exam-room references help candidates practice locating answers under timed conditions. The recommended study books provide additional explanations of piping, hydronic heating, oil burners, system operation, troubleshooting, equipment, and installation principles. Together, these materials create an organized foundation for Connecticut S-9 exam preparation.

Because the S-9 test is open book, familiarity with the references is essential. Candidates should not expect to search unfamiliar books for every answer during the examination. Effective preparation includes studying the content, learning how each reference is organized, practicing calculations, and developing a reliable navigation system using permitted permanent tabs and annotations.

The examination package is intended for professionals pursuing the contractor-level S-9 credential. Candidates should prepare for both technical questions and the practical application of heating and cooling principles. Field experience is valuable, but the examination may require precise answers based on published codes, standards, manuals, and accepted industry practices.

Exam Details

The Connecticut Limited Heating & Cooling Contractor (S-9) trade examination contains 80 questions. Candidates are allowed three hours to complete the examination, and a minimum score of 70 percent is required to pass.

The published examination content outline includes:

• Insulation: 2 questions
• Hangers and Supports: 3 questions
• Sound, Vibration, and Seismic Control: 1 question
• Heating and Cooling Principles: 3 questions
• Refrigerants and Refrigeration: 8 questions
• Testing, Adjusting, and Balancing: 3 questions
• Controls: 5 questions
• Air-Conditioning and Heat Pump Equipment: 5 questions
• Furnaces and Heaters: 5 questions
• Hydronics: 2 questions
• Chimneys, Flues, and Vents: 5 questions
• Combustion Air: 2 questions
• Fuel Gas Systems: 10 questions
• Ducts: 6 questions
• Ventilation and Exhaust: 3 questions
• Safety: 4 questions
• Oil Burners: 6 questions
• Load Calculations: 7 questions

Fuel gas systems are the largest individual category. Refrigeration, load calculations, ducts, and oil burners also represent significant portions of the examination. Candidates should study every category because the final score is based on performance across the entire test.

With 180 minutes for 80 questions, candidates have an average of slightly more than two minutes per question. That time includes reading the question, identifying the applicable reference, locating the information, completing any calculation, and selecting an answer. Timed practice can help candidates improve their pacing before exam day.

The examination may contain questions based on the listed references, general trade knowledge, or accepted industry practices. Code questions are based on the editions identified for the examination. Candidates should pay close attention to the specified code editions because provisions and section numbering can change between editions.

Open Book Test

The Connecticut S-9 Limited Heating & Cooling Contractor examination is an open-book test. Candidates may bring approved reference materials into the examination center, subject to the current testing rules.

Approved references may be highlighted, underlined, annotated, and indexed before the examination. Permanent tabs may be used to identify important chapters, tables, calculations, and subject areas. Temporary tabs, removable notes, and loose papers are not permitted.

Candidates may not write in their references during the examination session. Questions and answers may not be written inside the books. Materials that do not comply with the examination-center rules may be removed or confiscated.

A silent, nonprinting, non-programmable calculator may be used. Candidates should become comfortable completing load calculations, gas pipe sizing, airflow calculations, refrigeration questions, and other trade-related math with an approved calculator before the scheduled examination.

For NFPA 54 gas pipe-sizing questions, candidates must use the longest-length method. Practice should include identifying the longest piping run, determining connected demand, selecting the correct table, and choosing the appropriate pipe size.

Because this is a multi-reference examination, candidates should create a consistent navigation system. Helpful permanent tab categories may include load calculations, refrigeration, controls, heat pumps, furnaces, hydronics, combustion air, gas piping, oil burners, ducts, ventilation, exhaust, OSHA safety, and LP-Gas.

Licensing Steps

The Connecticut Department of Consumer Protection regulates heating, piping, and cooling occupational licenses. Applicants must complete the applicable contractor application and receive examination eligibility before scheduling the S-9 test.

1. Review the S-9 license scope. Confirm that the Limited Heating & Cooling Contractor classification matches the work you plan to perform.
2. Complete the contractor application. Submit the applicable application and supporting documents to the Connecticut Department of Consumer Protection.
3. Document qualifying experience and education. Provide the records required to establish your journeyperson experience or equivalent training.
4. Receive examination eligibility. The state must approve the application before the examination can be scheduled.
5. Register for the required examinations. Contractor applicants are generally required to pass both the S-9 trade examination and the applicable contractor business examination.
6. Prepare the references. Study the books, practice calculations, and organize approved exam-room materials according to testing-center rules.
7. Complete the examinations. Pass the required examination portions within the applicable eligibility and score-validity periods.
8. Complete license issuance. Follow the state’s instructions for submitting passing score reports, fees, and any remaining licensing documents.

Contractor examination eligibility is generally valid for one year from the date the state approves the application. A passed examination portion remains valid for the period established in the candidate bulletin. Candidates should plan their testing schedule so both required portions are completed within the applicable period.

State Requirements

The Connecticut S-9 license is a limited heating and cooling contractor credential. Its scope includes the installation, repair, replacement, maintenance, or alteration of qualifying heating and cooling apparatus, piping, appliances, devices, and accessories.

The classification covers heating systems and boilers, including apparatus and piping used for generating or conveying steam and associated pumping equipment. It also includes hot-water, chilled-water, condenser-water, and steam piping used in air-conditioning systems within the limits of the credential.

The S-9 scope is limited to buildings not exceeding three stories, a total heating load not exceeding 500,000 BTUs, steam pressure not exceeding 15 pounds, and cooling installations up to 35 tons per system.

The license also permits piping for petroleum-based fuels and alternative fuels, including tanks and related equipment. LP-Gas supplied by containers, natural gas piping, approved gas appliances, gas utilization equipment, and accessories are included within the classification. Sheet metal work associated with the limitations of the credential is also included.

To qualify for the contractor examination, an applicant must have two years of experience as a properly licensed journeyperson or equivalent experience and training accepted by the Connecticut Department of Consumer Protection.

Applicants using an equivalent experience and education pathway must document the required classroom instruction and on-the-job training. The state’s published equivalency chart identifies 10,000 total on-the-job training hours and 576 classroom hours for the S-9 contractor classification.

Reference Books

• Manual J – Residential Load Calculations, Reprinted 2016, Eighth Full Edition
  This ACCA manual supports residential heating and cooling load calculations. It addresses building heat loss, heat gain, design conditions, construction characteristics, infiltration, ventilation, windows, doors, walls, ceilings, and equipment-sizing considerations.
• International Residential Code for One- and Two-Family Dwellings, 2021
  This code covers residential building, mechanical, fuel gas, and related requirements for qualifying one- and two-family dwellings and townhouses. It supports review of equipment installation, combustion air, venting, duct systems, fuel gas piping, appliances, and residential safety provisions.
• International Mechanical Code, 2021
  The International Mechanical Code addresses mechanical systems, equipment installation, ventilation, exhaust, combustion air, ducts, appliances, chimneys, vents, refrigeration, hydronic systems, and related safety requirements.
• NFPA 31: Standard for the Installation of Oil-Burning Equipment, 2011
  NFPA 31 provides installation requirements for oil-burning equipment and associated systems. It supports study of oil tanks, fuel supply piping, burners, controls, equipment locations, combustion, venting, clearances, and installation safeguards.
• NFPA 54: National Fuel Gas Code Handbook, 2012
  This handbook supports preparation involving natural gas piping, pipe sizing, pressure, materials, joints, valves, appliance connections, combustion air, venting, testing, and equipment installation. Gas pipe-sizing questions require the longest-length method.
• Code of Federal Regulations – 29 CFR Part 1926 (OSHA)
  This federal construction-safety reference covers workplace requirements affecting construction activities. Relevant topics may include personal protective equipment, ladders, scaffolds, electrical safety, fall protection, excavation, material handling, tools, and jobsite practices.
• Modern Refrigeration and Air Conditioning, 22nd Edition
  This comprehensive HVAC reference covers refrigeration principles, refrigerants, system components, air conditioning, heat pumps, controls, electrical systems, troubleshooting, installation, service procedures, and heating equipment.
• ACCA Ductulator
  This calculation tool supports duct-sizing and airflow work. It helps candidates review relationships among airflow, duct dimensions, velocity, friction rate, and pressure loss for common HVAC duct systems.
• HVAC Duct Construction Standards, Metal and Flexible, 2005, 3rd Edition
  This SMACNA standard addresses construction and installation practices for metal and flexible HVAC duct systems, including reinforcement, joints, supports, materials, pressure classifications, and related fabrication requirements.
• NFPA 58: Liquefied Petroleum Gas Code, 2014
  NFPA 58 covers the storage, handling, transportation, and use of LP-Gas. It supports study of containers, cylinders, tanks, regulators, piping, valves, separation distances, installation locations, protection, and safety.
• Pipefitter’s Handbook
  This recommended study reference provides practical piping information, measurements, calculations, fittings, layouts, materials, and field-oriented reference data. It supports review of piping principles but is not permitted inside the S-9 examination room.
• Modern Hydronic Heating for Residential and Light Commercial Buildings, John Siegenthaler, P.E., 2022
  This technical study book explains modern hydronic heating systems, heat sources, distribution, circulators, controls, piping arrangements, radiant systems, hydraulic separation, system design, and energy-efficient applications. It is a study reference and is not permitted inside the examination room.
• Residential Oil Burners, 3rd Edition
  This recommended study reference explains residential oil burner operation, fuel delivery, combustion, ignition, controls, adjustment, testing, service, maintenance, and troubleshooting. It is not permitted inside the S-9 examination room.

Exam Room Approved Books

The following references in this package are approved for use inside the Connecticut S-9 examination room:

• Manual J – Residential Load Calculations, Eighth Full Edition
• International Residential Code for One- and Two-Family Dwellings, 2021
• International Mechanical Code, 2021
• NFPA 31: Standard for the Installation of Oil-Burning Equipment, 2011
• NFPA 54: National Fuel Gas Code Handbook, 2012
• Code of Federal Regulations – 29 CFR Part 1926 (OSHA)
• Modern Refrigeration and Air Conditioning, 22nd Edition
• ACCA Ductulator
• HVAC Duct Construction Standards, Metal and Flexible, 2005, 3rd Edition
• NFPA 58: Liquefied Petroleum Gas Code, 2014

Pipefitter’s Handbook, Modern Hydronic Heating for Residential and Light Commercial Buildings, and Residential Oil Burners, 3rd Edition are recommended study resources but are not allowed inside the examination center.

Test Information and Study Materials

A productive study plan should follow the S-9 content outline. Begin with fuel gas systems, refrigeration, load calculations, ducts, and oil burners because these categories account for many of the examination questions. Continue with controls, furnaces, heat pumps, venting, OSHA safety, ventilation, balancing, hydronics, insulation, and supports.

Practice Manual J calculations until you can identify the necessary building information and move through the calculation process efficiently. Review heat loss, heat gain, indoor and outdoor design conditions, orientation, construction assemblies, windows, infiltration, and ventilation.

Use Modern Refrigeration and Air Conditioning for refrigeration cycles, refrigerants, compressors, condensers, evaporators, metering devices, controls, heat pumps, furnaces, electrical troubleshooting, system charging, testing, and servicing principles.

Study the International Mechanical Code and International Residential Code for equipment installation, combustion air, chimneys, vents, ventilation, exhaust, ducts, appliances, and mechanical safety. Review NFPA 54 for fuel gas systems, NFPA 31 for oil-burning equipment, and NFPA 58 for LP-Gas systems.

Use the ACCA Ductulator and SMACNA duct standard together when reviewing duct sizing and construction. Candidates should understand airflow, velocity, friction rate, duct dimensions, fittings, supports, reinforcement, pressure classes, and installation requirements.

Complete timed practice sessions using the same approved references and calculator intended for exam day. Mark difficult questions for review rather than spending too much time on one item. After each practice session, locate the correct supporting information and review why the answer applies.

How 1 Exam Prep Helps You Reach Your Goal

1 Exam Prep helps Connecticut S-9 candidates organize a large and technically diverse group of references into a focused preparation plan. This package brings together the codebooks, standards, calculation resources, and technical study materials connected to the Limited Heating & Cooling Contractor examination.

Trade-focused review helps candidates connect each content category with the appropriate reference. Manual J supports load calculations, NFPA 54 addresses fuel gas, NFPA 31 covers oil-burning equipment, NFPA 58 addresses LP-Gas, and Modern Refrigeration and Air Conditioning reinforces refrigeration and HVAC equipment knowledge.

Reference-navigation practice helps candidates develop the speed required for a three-hour open-book examination. Becoming familiar with indexes, chapters, definitions, tables, formulas, and permanent tabs can reduce unnecessary searching and support more consistent decision-making.

Practice-oriented preparation also helps candidates identify weak areas before exam day. Reviewing missed questions and locating the supporting code provision or technical principle can strengthen understanding of heating, cooling, refrigeration, ducts, fuel systems, controls, hydronics, safety, and load calculations.

No exam-preparation package can guarantee a passing score or license approval. Consistent study, qualifying field experience, accurate calculations, organized references, and effective time management remain important parts of the Connecticut licensing process.

Frequently Asked Questions

Is the Connecticut S-9 examination open book?

Yes. The S-9 Limited Heating & Cooling Contractor examination is open book. Candidates may bring approved references into the examination center under the current testing rules.

How many questions are on the S-9 examination?

The S-9 trade examination contains 80 questions. Candidates have three hours to complete the test and must earn a minimum score of 70 percent.

Are all books in this package allowed into the examination?

No. The package includes approved exam-room references and recommended technical study books. Pipefitter’s Handbook, Modern Hydronic Heating, and Residential Oil Burners are study resources that are not permitted inside the examination center.

Can approved books be highlighted and tabbed?

Approved references may be highlighted, underlined, annotated, and indexed before the examination. Permanent tabs are allowed. Temporary tabs, removable notes, and loose papers are prohibited.

What gas pipe-sizing method is required?

Candidates must use the longest-length method for gas pipe-sizing questions based on NFPA 54.

Does the S-9 exam include load calculations?

Yes. Load calculations account for seven questions in the published content outline. Manual J is an important reference for preparing for this category.

What work is covered by the S-9 license?

The S-9 classification covers qualifying heating and cooling systems within the limits established by Connecticut, including buildings up to three stories, specified heating and steam limits, and cooling installations up to 35 tons per system.

Is a business examination required for an S-9 contractor?

Contractor applicants are generally required to pass both the applicable trade examination and the contractor business examination as part of the licensing process.

Does purchasing this package guarantee a passing score?

No. Examination results depend on the candidate’s knowledge, experience, preparation, calculation skills, reference-navigation ability, time management, and performance on test day.