Using h2o as the warmth transfer medium is referred to as hydronics. The heated drinking water might also offer an auxiliary heat exchanger to provide hot drinking water for bathing and washing. Refrigerant: Employed in air con programs and heat pumps, the refrigerant transfers heat outside to cool a creating. https://hvac39404.blogdigy.com/hvac-things-to-know-before-you-buy-47531744