How an HVAC System Works



Of course you know that HVAC stands for Heating, Ventilating, and Air Conditioning. But do you know how an HVAC system really works? Did you know that even though your central heating and central cooling systems are matched together, in reality they are completely separate components. Here is how an HVAC system operates.


Central cooling system

First let’s talk about the central cooling system. The central cooling system is in essence a split system, meaning that it is comprised of an outdoor cabinet with condenser and compressor units built in. While the compressor and condenser are stored outside, the evaporator coil is housed inside. This is where the separate systems are brought together, installed in conjunction with both the air handler and the furnace.

The air exchange

Your unit first takes warm air from inside the structure and blows it across the evaporator coil. The heat energy then transfers the air to the refrigerant that is already inside the coil. The transfer is what allows the unit to cool the air. The refrigerant then is pumped back into the compressor and the whole cycle starts all over again.

Central heating system

For your central heating system, this has a primary heating source such as a furnace. A furnace will usually be located in the basement, garage, or even the attic of your home or structure. Quite simply, the furnace feeds an energy source into the unit (usually natural gas or electricity) at the same time it brings in air. Burners in the furnace then heat up the air and deliver it into your structure by way of the air ducts.

While this is a very simplified version of how your HVAC central cooling and heating system works, still it gives you the basic idea.

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