A bunch of new HVAC graphics have been added to the free Inspection Gallery:

https://www.nachi.org/gallery/general-4/refrigerant-chiller

https://www.nachi.org/gallery/general-4/ground-source-heat-pump

https://www.nachi.org/gallery/general-4/high-rise-building-heating-and-cooling

https://www.nachi.org/gallery/general-4/chilled-water-system

https://www.nachi.org/gallery/general-4/seawater-cooled-chiller

https://www.nachi.org/gallery/general-4/cooling-tower