Today’s HVAC industry offers a number of choices when it comes to providing heating and cooling in a large building. The three basic methods to provide comfort and move Btu around a building are by using water, air or refrigerant.
NSF International recently published the first in a series of American National Standards for geothermal piping systems — NSF/ANSI 358-1: Polyethylene Pipe and Fittings for Water-Based Ground-Source “Geothermal” Heat Pump Systems.