Refrigeration III HVAC 9030 Email to a Friend Through our Refrigeration III course, learn about rooftop condensers, chillers, humidifiers, heat pumps, electronic and curtain air cleaning equipment, odour control, commercial air conditioning and troubleshooting. Prerequisite(s) You must have completed our HVAC 9058 Refrigeration II course or an approved equivalent. Contact Information 416-415-5000, ext. 4861 email@example.com Course Section(s) Available Class dates and registration for the upcoming year (September 2017 to August 2018) will be available on this website in early July 2017. Please visit this page again at that time. Some courses require you to purchase a textbook. The cost of the textbook is not included in the course fee unless otherwise indicated. If there is a textbook assigned for this course, it will be listed on the bookstore website.