Antifreeze is one word that hydronic system owners should understand. For the hydronic HVAC contractor, this antifreeze is more accurately described as the heat transfer fluid necessary for the proper ...

Geothermal heat exchangers almost always use condenser water or glycol as the heat transfer medium — and, sometimes, refrigerant. Wastewater heat recovery systems typically preheat domestic cold water ...

Known as methyl ethyl glycol, 1,2-propanediol, or propane-1,2-diol, propylene glycol, is a synthetic, clear, colorless liquid that is widely used as an additive or antifreeze within the food, chemical ...