A Lennox engineer explains how the equipment worksLennox, a national provider of home heating and cooling systems, has donated a Variable Refrigerant Flow (VRF) Heating, Ventilation and Air Conditioning (HVAC) unit to Salina Area Technical College.

The donation will allow students to learn about a state-of-the-art technology that is becoming increasingly common in the U.S. The equipment is worth about $20,000.

VRF systems were invented in the 1980s and are commonly used in Japanese office buildings, but they are still relatively new in the U.S. A single VRF unit can recover heat from a part of a building that is too hot and move it to an area that is too cool, allowing it to heat and cool different parts of the same building. The systems are more energy efficient than conventional HVAC systems.

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