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| Description | Link to Resource |
| Thermostat Forums is a place to discuss HVAC thermostats | |
| Reliable Controls® Corporation manufactures simple, flexible, and economical BACnet® software and BACnet® controller products that control the Heating, Ventilation, and Air-Conditioning (HVAC) equipment found in commercial, institutional, and agricultural buildings. | |
| Refrigeration Basics.com | |
| HVAC Technicians Resources | |
| HVAC Directory and Information site. HVAC News, HVAC Events, HVAC Training Calendar for industry professionals. Visit The HVAC Web Connection | |
| Good source for HVAC and trade related books and reference guides. | |
| Refrigeration Technologies offers products and technical information concerning refrigeration: | |
| HVAC Training for Technicians |
HVAC Manufacturers
Refrigeration Pressure Switches
