The 1 Package: All-Inclusive Connecticut Limited Warm Air, Air Conditioning and Refrigeration System Contractor (D-1) Exam, Licensing & Business Setup Solution

Prepare for the Connecticut Limited Warm Air, Air Conditioning and Refrigeration System Contractor (D-1) licensing process with an all-inclusive package that combines highlighted and tabbed rental books, one year of online course access, Application Service, business setup support, and contractor compliance guidance. The 1 Package is designed for candidates who want a coordinated solution for exam preparation, license application organization, and the initial business-formation steps associated with operating a Connecticut HVAC contracting company.

The Connecticut D-1 contractor 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 trade concepts while also developing the ability to locate code provisions, technical explanations, sizing information, formulas, tables, and equipment requirements within an open-book examination.

This package includes the complete group of listed D-1 trade examination references, a duct-sizing calculator, and the Connecticut contractor Business and Law examination book. Every included book is highlighted and permanently tabbed to create an organized starting point for study and exam-room reference navigation.

The package also includes one year of course access. Candidates can use the online preparation program to review the D-1 content outline, reinforce technical knowledge, work through practice-oriented material, and develop a consistent approach to open-book questions. The course structure supports preparation in fuel-gas systems, refrigeration, load calculations, duct construction, heating and cooling principles, controls, equipment, ventilation, safety, and other tested areas.

Application Service is included to support organization of the Connecticut D-1 contractor license application. Business Formation, EIN Filing with the IRS, and Contractor Compliance Guidance are also included to help customers establish a legally structured business and prepare for the administrative responsibilities associated with operating a Connecticut warm-air, air-conditioning, and refrigeration contracting company.

The package cost is $3,310. A refundable deposit of $1,050 is required for the rental books, making the total due $4,360. The $1,050 deposit is refundable when all rental books are returned within one year in similar condition.

Please allow up to 15 business days for The 1 Package book orders.

Exam Details

The Connecticut D-1 Limited Warm Air, Air Conditioning and Refrigeration System Contractor 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 of the 70 trade questions. Candidates should understand gas-piping systems, sizing, pressure, regulators, appliance connections, combustion air, venting, testing, and related safety provisions. The longest-length method must be used for gas-pipe sizing questions.

Refrigerants and refrigeration account for eight questions. Preparation should include refrigeration-cycle principles, refrigerants, components, system operation, pressure and temperature relationships, charging, recovery concepts, maintenance, and troubleshooting.

Ducts and load calculations each account for six questions. Candidates should be prepared to work with residential and small-commercial load-calculation procedures, duct-sizing concepts, airflow, fittings, pressure loss, construction standards, and distribution-system performance.

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

Contractor candidates must also pass the Connecticut Business and Law examination. That examination contains 50 questions, allows two hours, and requires a minimum score of 70 percent. Its subject areas include licensing, estimating and bidding, lien law, financial management, tax laws, labor laws, project management, contracts, business organization, risk management, 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 the approved references into the testing center under the applicable examination rules.

The D-1 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 ACCA 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 contractor Business and Law examination.

Approved books may be highlighted, underlined, annotated, and indexed before the examination. Permanent tabs may be used to identify chapters, definitions, tables, fuel-gas topics, refrigeration subjects, controls, load calculations, ductwork, safety requirements, and other useful material.

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

Every included book in this package arrives highlighted and permanently tabbed. Candidates should review every tab before test day, study the highlighted sections, and learn how the books are organized. Prepared references are most helpful when the candidate understands the subject connected to each marked location.

A practical open-book strategy begins with identifying the main subject. Mechanical-code questions may lead to the International Mechanical Code. Residential load calculations may require Manual J, while small-commercial load calculations may require Manual N. Fuel-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 the SMACNA HVAC Duct Construction Standards. Technical refrigeration, equipment, 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 provide.
2. Document the qualifying pathway. Prepare records showing the applicable classroom education, on-the-job training, license history, and contractor-level experience required for the application route.
3. Use the included Application Service. Receive assistance organizing the D-1 contractor application and supporting information for submission.
4. Submit the Connecticut application. Provide the completed application, supporting records, and applicable state fees to the Connecticut Department of Consumer Protection.
5. Receive examination eligibility. Connecticut reviews the applicant’s qualifications and determines whether the candidate may proceed to testing.
6. Prepare for the D-1 trade examination. Use the highlighted and tabbed books with one year of course access to review the complete examination outline.
7. Prepare for Business and Law. Study the included Connecticut contractor business book and practice locating information related to licensing, contracts, finance, taxes, labor, risk, and project administration.
8. Schedule the examinations. Follow the examination provider’s registration and scheduling process after eligibility is granted.
9. Pass the required examinations. Complete both the D-1 trade examination and the Connecticut contractor Business and Law examination.
10. Complete license issuance requirements. Submit passing score reports and any remaining licensing documents or fees required by Connecticut.
11. Form the business entity. Use the included Business Formation service to establish an LLC or corporation for the contracting company.
12. Obtain the EIN. Use the included EIN Filing service to obtain the federal tax identification number for the business.
13. Organize contractor compliance. Use the included guidance to understand licensing, business-registration, tax, insurance, contract, and operational responsibilities that may apply.

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 pathway. For an equivalent out-of-state contractor license review, Connecticut identifies 8,000 hours of on-the-job training and 432 classroom hours for the D-1 classification. Applicants using another pathway must submit the documentation required for that application type.

Only an individual may apply for the occupational contractor license. The business entity and the individual D-1 license serve different purposes. The included Business Formation service establishes the company structure, while the occupational license identifies the individual authorized to perform or contract for the regulated work.

All Connecticut contractors covered by the heating, piping, and cooling examination program must pass both the applicable trade examination and the Business and Law examination.

The D-1 license is limited to its authorized scope. It does not automatically authorize unrelated electrical, plumbing, unlimited heating, sheet-metal, 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-calculation preparation, including building characteristics, heat gain, heat loss, and equipment-sizing inputs.
• Included Rental Book: Manual N - Commercial Load Calculation for Small Commercial Buildings, 5th Edition
  Supports load-calculation preparation for qualifying small-commercial buildings and related HVAC design conditions.
• Included Rental Book: NFPA 54 - National Fuel Gas Code Handbook, 2012
  Covers gas piping, appliance installation, combustion air, venting, testing, regulators, and fuel-gas safety requirements.
• Included Rental Book: Code of Federal Regulations - 29 CFR Part 1926 (OSHA)
  Supports preparation involving construction safety, fall protection, personal protective equipment, ladders, scaffolds, excavation, electrical safety, 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, system operation, maintenance, and troubleshooting.
• Ductulator
  Supports duct-sizing calculations, airflow review, velocity, friction-rate relationships, and distribution-system preparation.
• Included Rental Book: HVAC Duct Construction Standards, Metal and Flexible, 2005, 3rd Edition
  Covers duct construction, reinforcement, materials, fittings, supports, sealing, and fabrication requirements.
• Included Rental Book: NFPA 58 - Liquefied Petroleum Gas Code, 2014
  Covers LP gas containers, storage, regulators, piping, equipment, separation requirements, and related 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, estimating, contracts, finance, taxes, labor, project management, risk, and safety.

Exam Room Approved Books

The trade books, Ductulator, and Connecticut Business and Law reference included in this package are approved for their applicable open-book examinations. Candidates are responsible for bringing the required materials to the testing center.

The highlighted and tabbed books should be used throughout the one-year course-access period. Repeated practice helps candidates learn chapter locations, index terminology, table organization, and the relationship between the examination subjects and the approved references.

Test Information and Study Materials

A productive D-1 study plan should begin with fuel-gas systems, refrigeration, load calculations, and ducts because these categories account for a substantial portion of the trade examination. Candidates should practice gas-pipe sizing with the longest-length method and become comfortable using the load-calculation manuals and Ductulator.

Review refrigeration-cycle operation, refrigerants, compressors, condensers, evaporators, metering devices, controls, pressures, temperatures, charging principles, and troubleshooting. Study air-conditioning and heat-pump equipment together with furnaces, heaters, chillers, ventilation, and exhaust systems.

Use the International Mechanical Code for formal installation and safety requirements. Use NFPA 54 and NFPA 58 for natural-gas and LP gas questions. Use OSHA for construction-safety questions and the SMACNA standard for duct-construction requirements.

The included course helps candidates organize these references by subject, practice open-book research, and identify weaker areas. The Business and Law preparation should be treated as a separate study track covering licensing, estimating, contracts, business organization, taxes, labor, financial management, project administration, risk, environmental responsibilities, and safety.

How 1 Exam Prep Helps You Reach Your Goal

1 Exam Prep brings exam preparation, application organization, and business setup services together in one coordinated D-1 package. Candidates receive the listed highlighted and tabbed references, one year of course access, Application Service, Business Formation, EIN Filing, and Contractor Compliance Guidance.

Trade-focused review helps candidates connect each D-1 examination category with the appropriate book. Practice-oriented preparation reinforces technical knowledge while helping candidates improve reference selection, index use, table navigation, load calculations, duct sizing, and time management.

The highlighted and tabbed books provide an organized study framework. The online course helps candidates work through the material in a structured sequence, while Application Service supports preparation of the licensing submission.

Business Formation and EIN Filing help establish the administrative foundation of the contracting company. Contractor Compliance Guidance supports a clearer understanding of the responsibilities involved in maintaining an organized Connecticut business operation.

No exam-preparation, application, or business-setup service can guarantee examination eligibility, a passing score, license approval, business profitability, or state approval. Candidates remain responsible for meeting Connecticut’s qualification requirements, providing accurate information, completing the examinations, and complying with applicable laws and regulations.

FAQ Section

What is included in The 1 Package?

The package includes highlighted and tabbed D-1 trade books, the Business and Law book, a Ductulator, one year of course access, Application Service, Business Formation, EIN Filing, and Contractor Compliance Guidance.

What is the total cost?

The package cost is $3,310. A refundable $1,050 book deposit is required, making the total $4,360.

How does the refundable deposit work?

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

Are the books highlighted and tabbed?

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

How long should I allow for the book order?

Please allow up to 15 business days for The 1 Package book orders.

How long is the course available?

The package includes 1 year of course access.

Is Application Service included?

Yes. Application Service is included to support organization of the Connecticut D-1 contractor application.

Are Business Formation and EIN Filing included?

Yes. The package includes formation of an LLC or corporation and filing for the business EIN with the IRS.

Is the D-1 examination open book?

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

How many questions are on the D-1 examination?

The trade examination contains 70 questions. Candidates have three hours and must earn a minimum score of 70 percent.

Is a Business and Law examination required?

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

Does 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.