- elearning-training.com
 - Offers interactive, certified online courses in heating, ventilation, air conditioning, and refrigeration (HVACR). - HVACTraining.com
- Information, books, training, videotapes, and other resource materials.
- Northwestern Technological Institute
- Provides heating, air conditioning, and refrigeration career training.
- Real-World-Refrigeration.com
- Refrigeration information that reflects service and repairs encountered in the real world, on the job, in the field.
- Refrigeration School, Inc.
- RSI of Phoenix, Arizona, offers HVAC education and technical training in the fields of air conditioning, heating, and ventilation systems.
- Tempcon Inc.
- Conducts on-site and regional training seminars on HVAC, DDC, and pneumatic controls systems for HVAC building operations and design engineering personnel.
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