An HVAC heat exchanger is a piece of machinery that transfers heat from one material to another. The heat exchanger is usually made up of two separate pipes or chambers separated by a wall. Within the unit's ventilation system energy is recovered through this exchange. This contributes to the overall efficiency of the system. Heat exchangers are commonly used in refrigeration systems, space heaters, and air conditioning units. At HVAC Brain we carry Air-To-Air and Flat Plate heat exchangers . Shop with us today!