Heating and Air Conditioning Load Calculations

I.     Course Prefix/Number: AHR 203

       Course Name: Heating and Air Conditioning Load Calculations

       Credits: 3 (3 lecture; 0 lab)

II.    Prerequisite

AHR 101 or consent of department chair

III.   Course (Catalog) Description

Course covers calculation of heating and cooling loads to determine appropriate selec-tion of equipment in new construction. Content includes construction and heat transfer through structure, and computations for heat gains and heat losses for various building structures.

IV.   Learning Objectives

Upon successfully completing the course, the student will be able to analyze a building's structure and determine the most suitable equipment for heating and cooling.  Energy re-lated calculations for annual energy consumption estimates are included in this course.

V.    Academic Integrity and Student Conduct

Students and employees at Oakton Community College are required to demonstrate academic integrity and follow Oakton's Code of Academic Conduct. This code prohibits:

• cheating,
• plagiarism (turning in work not written by you, or lacking proper citation),
• falsification and fabrication (lying or distorting the truth),
• helping others to cheat,
• unauthorized changes on official documents,
• pretending to be someone else or having someone else pretend to be you,
• making or accepting bribes, special favors, or threats, and
• any other behavior that violates academic integrity.

There are serious consequences to violations of the academic integrity policy. Oakton's policies and procedures provide students a fair hearing if a complaint is made against you. If you are found to have violated the policy, the minimum penalty is failure on the assignment and, a disciplinary record will be established and kept on file in the office of the Vice President for Student Affairs for a period of 3 years.

Please review the Code of Academic Conduct and the Code of Student Conduct, both located online at

VI.   Sequence of Topics

Week    Topic

1    Introduction    NESCA 1 3
      Heat and Comfort    CAC 1   
      Components of Heat Gains and Losses
      Design Conditions
2    Components of Construction    NESCA 4 11
      Heat Transfer Multipliers
      Walls, Roofs, Floors, Windows
3    Components of construction, heat transfer
      multipliers (HTM) for walls, roofs, floors,
      windows - continued.
4    (People, Lights and Appliances
      Residential Heating Loads)
5    Working through sample heating load
      calculations in text.   
6    EXAMINATION [calculating residential
      heating load]
7    Review of Examination.
      Begin (Residential Air Conditioning load calculations. 
      Analysis of structure and effects on Air Conditioning
8    Summer Temperature Difference
      Summer Cooling Transmission Gains
9    Solar Heat Gain
      Shading Effects
11  Internal Heat Gains, Infiltration and
      Ventilation loads.
12  Working through sample Air Conditioning
      calculations in text.
13  Examination - Residential Air Conditioning
      load calculation
14  Review of Examination
15  Computing Annual Energy Consumption
16  General Review and equipment sizing
      and selection.  Give take-home final exam
      to calculate complete heating and Air
      Conditioning loads for residence.
17  Collect and go over final exam on one to one basis.

VII.  Methods of Instruction

Overheads, class discussion, example problems
Course may be taught as face-to-face, hybrid or online course.

VIII. Course Practices Required

Reading, understanding usage of tables and charts, mathematics, interpretative skills.  Completion of Homework Assignments.

IX.   Instructional Materials

Note: Current textbook information for each course and section is available on Oakton's Schedule of Classes.

Required Books:   
Load Calculations for Residential Winter and Summer Air Condi-tioning, Manual J (ACCA)
Air Conditioning Contractors Association.

X.    Methods of Evaluating Student Progress

Residential Examination        25%
Commercial Examination        25%
Final Examination            25%
Attendance, Participation        25%
neatness of work and accuracy
All examinations will be open textbook and notes.

XI.   Other Course Information

If you have a documented learning, psychological, or physical disability you may be entitled to reasonable academic accommodations or services. To request accommodations or services, contact the Access and Disability Resource Center at the Des Plaines or Skokie campus. All students are expected to fulfill essential course requirements. The College will not waive any essential skill or requirement of a course or degree program.

Oakton Community College is committed to maintaining a campus environment emphasizing the dignity and worth of all members of the community, and complies with all federal and state Title IX requirements.

Resources and support for
  • pregnancy-related and parenting accommodations; and
  • victims of sexual misconduct
can be found at www.oakton.edu/title9/.

Resources and support for LGBTQ+ students can be found at www.oakton.edu/lgbtq.