Connecticut Limited Warm Air, Air Conditioning and Refrigeration System Contractor (D-1) - Books & Courses Rental Package

Prepare for the Connecticut Limited Warm Air, Air Conditioning and Refrigeration System Contractor (D-1) licensing examinations with a comprehensive rental package that combines highlighted and tabbed trade references, the Connecticut contractor Business and Law book, a Ductulator, and six months of online course access. This package is designed for contractor candidates who want an organized approach to technical study, business-law preparation, and open-book reference navigation.

The Connecticut D-1 trade examination covers warm-air heating, air conditioning, refrigeration systems, fuel gas, ductwork, load calculations, controls, ventilation, equipment, safety, and related mechanical subjects. Candidates must understand practical HVAC concepts while also being able to locate code provisions, formulas, sizing information, technical tables, equipment requirements, and safety rules within a limited testing period.

This Books & Courses Rental Package includes the International Mechanical Code, 2021; Manual J; Manual N; NFPA 54; OSHA 29 CFR Part 1926; Modern Refrigeration and Air Conditioning, 22nd Edition; a Ductulator; HVAC Duct Construction Standards, Metal and Flexible, 2005, 3rd Edition; and NFPA 58. It also includes the Contractors Guide to Business, Law and Project Management, Connecticut, 6th Edition for the separate contractor Business and Law examination.

Every included book is highlighted and permanently tabbed before delivery. Important chapters, definitions, code provisions, fuel-gas topics, refrigeration subjects, load-calculation sections, duct-construction requirements, safety material, business-law topics, and frequently reviewed tables are marked to create an organized starting point for preparation.

The online course provides six months of course access. Candidates can use the course to review the D-1 trade outline, reinforce technical knowledge, complete practice-oriented preparation, and improve reference-navigation skills. The course also supports organized review for the separate Connecticut contractor Business and Law examination.

The rental cost is $1,885. A refundable book deposit of $1,050 is also required, making the total package price $2,935. The deposit is refundable when all rental books are returned within the rental period in similar condition.

Please allow up to 15 business days for Book & Course Rental Package book orders.

Exam Details

The Connecticut Limited Warm Air, Air Conditioning and Refrigeration System Contractor (D-1) trade examination contains 70 questions. Candidates are allowed three hours to complete the examination, and a minimum score of 70 percent is required to pass.

The D-1 examination content outline includes the following categories:

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

Fuel-gas systems are the largest category, accounting for 10 questions. Candidates should understand fuel-gas piping, appliance connections, regulators, pressure, testing, combustion air, venting, sizing procedures, and related safety requirements. Gas-pipe sizing preparation should include the longest-length method.

Refrigerants and refrigeration account for eight questions. Candidates should review the refrigeration cycle, refrigerants, compressors, condensers, evaporators, metering devices, pressure-temperature relationships, charging principles, system operation, maintenance, and troubleshooting.

Ducts and load calculations each account for six questions. Preparation should include airflow, duct sizing, friction rate, velocity, fittings, sealing, reinforcement, residential heat-gain and heat-loss calculations, small-commercial load calculations, and equipment-sizing considerations.

Heating and cooling principles, controls, and air-conditioning and heat-pump equipment each account for five questions. Candidates should understand heat transfer, system operation, thermostats, relays, safety controls, operating sequences, heat pumps, furnaces, and cooling equipment.

The Connecticut contractor Business and Law examination is separate from the D-1 trade test. It contains 50 questions, allows two hours, and requires a minimum score of 70 percent. Subjects include licensing, estimating, bidding, contracts, financial management, taxes, labor, project management, risk, business organization, environmental responsibilities, and safety.

Open Book Test

The Connecticut D-1 trade examination and the contractor Business and Law examination are open-book tests. Candidates may bring approved references into the testing center under the applicable examination rules.

The D-1 trade references included in this package are the International Mechanical Code, Manual J, Manual N, NFPA 54, OSHA 29 CFR Part 1926, Modern Refrigeration and Air Conditioning, the Ductulator, HVAC Duct Construction Standards, and NFPA 58.

The Contractors Guide to Business, Law and Project Management, Connecticut, 6th Edition is included for the separate Business and Law examination.

Approved references may be highlighted, underlined, annotated, and indexed before testing. Permanent tabs may be used to identify chapters, definitions, tables, formulas, fuel-gas topics, refrigeration subjects, load-calculation sections, ductwork, safety rules, and business-law material.

Temporary tabs, removable notes, loose papers, and inserted pages are not permitted. Candidates may not write in the books during the examination, and examination questions or answers may not be recorded inside the approved references.

Every included book arrives highlighted and permanently tabbed. Candidates should review each tab before exam day, study the marked sections, and practice locating information under timed conditions. Prepared references are most effective when the candidate understands the material connected to each tab.

Mechanical-code questions may lead to the International Mechanical Code. Residential load calculations may require Manual J, while qualifying small-commercial load calculations may require Manual N. Natural-gas questions may lead to NFPA 54, and LP gas questions may require NFPA 58.

Safety questions may require OSHA 29 CFR Part 1926. Duct-sizing questions may involve the Ductulator, while duct-construction questions may require HVAC Duct Construction Standards. Technical refrigeration, heating, air-conditioning, heat-pump, controls, and troubleshooting questions may be supported by Modern Refrigeration and Air Conditioning.

Licensing Steps

1. Review the D-1 license scope. Confirm that the Connecticut Limited Warm Air, Air Conditioning and Refrigeration System Contractor classification matches the services you intend to offer.
2. Document the qualifying pathway. Gather records showing the applicable education, on-the-job training, license history, and qualifying contractor-level experience.
3. Complete the contractor application. Submit the applicable D-1 application and supporting documentation to the Connecticut Department of Consumer Protection.
4. Receive examination eligibility. Connecticut reviews the applicant’s qualifications and determines whether the candidate may proceed to testing.
5. Prepare for the D-1 trade examination. Use the highlighted and tabbed rental books with six months of course access to review the complete trade outline.
6. Prepare for Business and Law. Study the included Connecticut contractor business book and review licensing, contracts, estimating, finance, taxes, labor, project management, risk, and safety.
7. Schedule the examinations. Follow the testing provider’s registration and scheduling procedures after eligibility is granted.
8. Complete the required examinations. Pass the D-1 trade examination and the Connecticut contractor Business and Law examination.
9. Complete license-issuance requirements. Submit passing results and any remaining documents or licensing fees required by Connecticut.
10. Return the rental books. Return the included books within the rental period in similar condition to qualify for the refundable $1,050 deposit.

Passing the examinations does not automatically issue the D-1 license. Applicants must complete Connecticut’s qualification, application, examination, documentation, and license-issuance requirements.

State Requirements

The Connecticut D-1 credential is a limited contractor license associated with warm-air heating, air-conditioning, and refrigeration systems. The classification covers qualifying installation, repair, replacement, maintenance, and alteration work involving these systems, including necessary piping used to convey heating or cooling media and associated pumping equipment.

Applicants must qualify through an accepted Connecticut licensing pathway and provide the applicable documentation. Connecticut may review classroom education, supervised on-the-job training, occupational license history, contractor experience, and other supporting records.

The D-1 contractor license is issued to an individual. A business entity and the individual occupational license serve different purposes. The individual license identifies the person authorized to contract for and oversee regulated D-1 work.

Connecticut contractor candidates must complete the applicable trade examination and the contractor Business and Law examination. Passing both tests does not automatically issue the license because all other application and qualification requirements must also be completed.

The D-1 classification is limited to its authorized scope. It does not automatically authorize unrelated electrical, plumbing, sheet-metal, unlimited heating, or other regulated work outside the classification. Additional credentials may be required when a project includes services beyond the D-1 scope.

Reference Books

• Included Rental Book: International Mechanical Code, 2021
  Covers mechanical systems, equipment installation, refrigeration machinery rooms, ventilation, combustion air, ducts, chimneys, vents, piping, and related requirements.
• Included Rental Book: Manual J - Residential Load Calculations, Eighth Full Edition
  Supports residential heating and cooling load calculations, including heat gain, heat loss, building characteristics, and equipment-sizing inputs.
• Included Rental Book: Manual N - Commercial Load Calculation for Small Commercial Buildings, 5th Edition
  Supports heating and cooling load calculations for qualifying small-commercial buildings.
• Included Rental Book: NFPA 54 - National Fuel Gas Code Handbook, 2012
  Covers fuel-gas piping, sizing, appliance installation, pressure regulation, combustion air, venting, testing, and safety requirements.
• Included Rental Book: Code of Federal Regulations - 29 CFR Part 1926 (OSHA)
  Supports preparation involving construction safety, personal protective equipment, fall protection, ladders, scaffolds, excavation, electrical hazards, and jobsite responsibilities.
• Included Rental Book: Modern Refrigeration and Air Conditioning, 22nd Edition
  Provides technical instruction on refrigeration, air conditioning, heating, heat pumps, controls, equipment, maintenance, and troubleshooting.
• Ductulator
  Supports preparation involving duct sizing, airflow, velocity, friction rate, and distribution-system calculations.
• Included Rental Book: HVAC Duct Construction Standards, Metal and Flexible, 2005, 3rd Edition
  Covers duct materials, reinforcement, fittings, sealing, supports, fabrication, and construction requirements.
• Included Rental Book: NFPA 58 - Liquefied Petroleum Gas Code, 2014
  Covers LP gas containers, storage, regulators, piping, installation, equipment, separation requirements, and safety provisions.
• Included Rental Book: Contractors Guide to Business, Law and Project Management, Connecticut, 6th Edition
  The approved reference for the Connecticut contractor Business and Law examination, covering licensing, contracts, estimating, finance, taxes, labor, project management, risk, and safety.

Exam Room Approved Books

The listed D-1 trade references, Ductulator, and Connecticut Business and Law book are included for their applicable open-book examinations. Candidates are responsible for bringing the required materials to the testing center.

All included books are highlighted and permanently tabbed. Candidates should use them throughout the six-month course-access period so chapter locations, index terms, formulas, tables, and tab positions become familiar before testing.

The examination center does not provide each candidate with a complete personal reference set. Candidates should inspect all materials before exam day and make sure permitted tabs, highlighting, and annotations comply with the applicable testing rules.

Test Information and Study Materials

A productive D-1 study plan should begin with fuel-gas systems, refrigeration, load calculations, and ducts because these subjects represent a substantial portion of the trade examination.

Practice gas-pipe sizing with the required method and learn how to locate the correct NFPA 54 tables. Review LP gas storage, containers, regulators, piping, equipment, and installation requirements in NFPA 58.

Use Manual J and Manual N to practice load-calculation concepts. Candidates should understand heat gain, heat loss, design conditions, building characteristics, equipment sizing, and the differences between residential and small-commercial calculations.

Use the Ductulator and HVAC Duct Construction Standards to review duct sizing, airflow, friction, velocity, fittings, materials, reinforcement, sealing, and support requirements.

Review the refrigeration cycle, refrigerants, compressors, condensers, evaporators, metering devices, pressure-temperature relationships, controls, heat pumps, chillers, furnaces, and system troubleshooting in Modern Refrigeration and Air Conditioning.

The included course helps organize these subjects and provides a practice-oriented study structure. Candidates should also create a separate Business and Law study track covering licensing, estimating, contracts, financial management, taxation, labor, project administration, business organization, risk, environmental responsibilities, and safety.

How 1 Exam Prep Helps You Reach Your Goal

1 Exam Prep helps Connecticut D-1 candidates prepare with an organized combination of highlighted and tabbed rental books, six months of course access, and both trade and Business and Law preparation materials.

Trade-focused study guidance helps candidates review fuel gas, refrigeration, air conditioning, heating, heat pumps, controls, load calculations, ducts, ventilation, safety, and mechanical requirements in a structured sequence.

Practice-oriented preparation helps candidates connect questions with the correct reference, use indexes and tables efficiently, work through calculations, and identify weaker subjects before exam day.

The highlighted and tabbed books provide an organized navigation framework. Candidates can review marked provisions, study related sections, and practice locating information under timed conditions using the same rental references intended for the examinations.

Six months of course access provides time to build a consistent study routine, revisit difficult topics, and prepare separately for the D-1 trade and contractor Business and Law examinations.

No exam-preparation package can guarantee examination eligibility, a passing result, application approval, or license issuance. Candidates remain responsible for meeting Connecticut’s qualification requirements, submitting accurate records, completing the examinations, and satisfying all licensing obligations.

FAQ Section

What is included in this Books & Courses Rental Package?

The package includes highlighted and tabbed D-1 trade references, a Ductulator, the Connecticut contractor Business and Law book, and 6 months of course access.

What is the total package price?

The rental cost is $1,885, plus a refundable $1,050 book deposit. The total package price is $2,935.

How does the refundable book deposit work?

The $1,050 deposit is refundable when all rental books are returned within the rental period in similar condition.

Are the included books highlighted and tabbed?

Yes. Every included book is highlighted and permanently tabbed before delivery.

How long should I allow for the order?

Please allow up to 15 business days for Book & Course Rental Package book orders.

How long is the course available?

The package includes 6 months of course access.

Is the D-1 examination open book?

Yes. The D-1 trade examination is open book, and candidates may bring approved references into the testing center under the applicable rules.

How many questions are on the D-1 trade examination?

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

Is the Connecticut Business and Law examination required?

Yes. Connecticut contractor candidates must pass the applicable trade examination and the contractor Business and Law examination.

Is the Business and Law book included?

Yes. The Contractors Guide to Business, Law and Project Management, Connecticut, 6th Edition is included, highlighted, and tabbed.

Does this package include Application Service?

No. Application Service is not identified as part of this Books & Courses Rental Package.

Does purchasing this package guarantee a D-1 license?

No. Applicants must meet Connecticut’s qualification requirements, receive examination eligibility, pass the required examinations, complete the licensing process, and receive state approval.