Healthy Homes, Part 12: Heating, Air Conditioning, and Ventilating Course

Welcome to InterNACHI's free, online Healthy Homes, Part 12: Heating, Air Conditioning, and Ventilating Course.  This is part 12 of a 14-part Certified Healthy Homes Inspector certification program. This course is provided by our accredited college at

Take the free online course now.


The goal of this course is to teach the student how to inspect heating, ventilating, and air conditioning HVAC systems and components, including related safety issues.


Upon successful completion, the student will be able to: 

  • identify the different types of standard fuels for heating; 
  • identify the various types of heating and cooling systems; 
  • explain how a heating and cooling system functions; 
  • determine the general safety risks of related to HVAC systems;
  • identify parts of a fireplace; 
  • communicate the safety issues associated with HVAC systems; 
  • perform an inspection related to HVAC; 
  • generate observations related to inspecting HVAC systems and components; and 
  • produce written reports related to observations conducted at a house.

Course includes:

  • 26 InterNACHI® CE credit hours
  • 25,252 words 
  • 25 quiz questions in three quizzes
  • Inspection and writing assignment
  • Research and writing assignment
  • 30-question final exam
  • Certificate of Completion

You will learn about the following topics: 

  • Our warming climate
  • Heating
  • Standard fuels
  • Central heating units
  • Space heaters
  • Hydronic systems
  • Direct vent wall furnaces
  • Cooling
  • Air conditioning
  • Circulating fans
  • Evaporation coolers
  • Safety
  • Chimneys
  • Fireplaces


Healthy Homes, Part 12: Heating, Air Conditioning, and Ventilating Course
Course #4824, Student Catalog 

Student WorkTime CalculationEstimated Clock Hour Time for the Average Student
Attendance for "Seat Time" 1# of minutes of student attendance / 505.1
Participation in Learning Activities 2# of minutes of online student participation / 501.0
Interactivity 3# of minutes of student interactivity / 500.5
Reading the Course Text 4# of words in the course / 100 words per minute / 505.1
Reading the Course Textbook 5# of words in the book / 100 words per minute / 502.5
Academic Engagement 6# of words in the course / 100 / 501.0
Direct Communication 7# of minutes of communication / 500.5
Instructional Video Learning 8# of minutes of video / 500.0
Reinforcement Q & A  9# of questions X 1.85 / 500.8
Writing Assignment of the Inspection  104.0 hours per assignment4.0
Writing Assignment of the Research  114.0 hours per assignment4.0
Academic Activities for an Inspection  128.0 hours for each inspection assignment8.0
Performing an Inspection  138.0 hours for each inspection8.0
Total clock hours
35.0 clock hours
35.0 InterNACHI CE Hours
3.5 CEU

In keeping with InterNACHI's commitment to Continuing Education, this online course is open and free to all members and can be taken repeatedly without limit.

Reminder to members:  InterNACHI's Code of Ethics 1.10 requires that you comply with all government rules and licensing requirements of the jurisdiction where you conduct business.  InterNACHI's courses and Standards generally exceed the Standards of Practice that you are required to abide by locally.