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How a Basic HVAC System Works

You probably already know that HVAC stands for Heating, Ventilating, and Air Conditioning. But do you really know how an HVAC system works? The primary function of the HVAC system in your home is to provide temperature control and produce acceptable indoor air quality (by controlling humidity and filtering the air). In Houston, people rely on their HVAC system to keep them cool in hot summer months. But do you know how the system works? Click To Tweet

Understanding Your HVAC System

Understanding the basic functions of an HVAC system and how it works is important to maintaining your current system in good condition. Whether you’re troubleshooting a problem or wondering if you need the help of a trained HVAC technician, understanding the basics helps.

  1. Thermostat
  2. Furnace
  3. Evaporator Coil
  4. Condensing Unit
  5. Vents
  6. Refrigerant
  7. Filters

1) Thermostat

Usually installed on a prominent location on an interior wall, the thermostat can be set manually or programmed to keep your home at your ideal temperature. When the temperature inside gets too hot or cold, the thermostat triggers your HVAC system to start circulating air as needed.

2) Furnace

Your furnace is usually the biggest component of your system, requiring a designated closet or space in your garage or basement. All furnaces consist of four main components: 1) burners that deliver and burn fuel, 2) heat exchangers, 3) a blower and 4) a flue that acts as an exhaust for gaseous by-products.

3) Evaporator Coil

The evaporator coil is used to cool down the air when your thermostat is set to a lower temperature. This cold air is then funneled throughout your home.

4) Condensing Unit

This large unit is found on the outside of your home and filled with what is called refrigerant gas. When the refrigerant is cooled, the condensing unit pumps this liquid to the evaporator coil to be transformed into gas again.

5) Vents

These are the outlets that help distribute heated and cooled air from the duct system into the various rooms of your home. They’re generally found near the ceiling with angle slats, designed to send the air downward.

6) Refrigerant

These lines carry refrigerant to the condensing unit in the form of gas. This gas is transformed to liquid form, then transferred back to the evaporator coil.

7) Filters

These lines carry refrigerant to the condensing unit in the form of gas. This gas is transformed to liquid form, then transferred back to the evaporator coil.

Trust an Expert

These are the basic components of your HVAC system, but if you’re experiencing an issue with your heating or cooling, it’s best to call an expert. DIY repair can be costly and dangerous.

Interested in becoming an HVAC tech? Contact Us to learn more or to sign up for classes.