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Subscribe to our RSS Feed What Are the Parts of a Household HVAC System?

Tuesday, October 28, 2014

Your home's HVAC system plays an essential role in your year-round comfort. HVAC systems vary by complexity, but all forced-air units contain these essential components for heating and cooling.

  • Furnace.Natural gas furnaces are by far the most common, but if gas isn't available, other options include fuel oil, propane, or electric.
  • Heat exchanger.When the furnace turns on, it heats a metal plate called a heat exchanger. A fan pushes air over this part, warms, and sends the air through the ductwork to heat the building.
  • Refrigerant lines. If your home has a central air conditioner, it uses refrigerant lines to send the refrigerant from the outdoor coil inside the condenser to the indoor coil, found in the blower compartment.
  • Evaporator coil. This coil contains the cold refrigerant that removes the heat from the air indoors. Part of the cooling process involves condensing the humidity in the air, which occurs on the evaporator coil and drains away through a pipe.
  • Condensing unit and coil. Central cooling systems use a condensing unit that sits outdoors. This condensing coil connects to the evaporator coil via the refrigerant line. A compressor puts the refrigerant under pressure, and a large fan inside the condenser blows the heat away from the warmed refrigerant returning from the evaporator coil.
  • Thermostat. The thermostat controls the HVAC system in your home. A programmable thermostat gives you more options for controlling the system that often result in measurable energy savings.
  • Ductwork. Forced-air systems use a network of ducts to deliver the conditioned air. They can be rigid or flexible, and their layout, insulation and tightness make an impact on how efficiently your system runs.
  • Vents. The vents or registers cover the openings for the supply and return ductwork. They're usually metal and may have adjustable louvers that let you direct the airflow.

For more information on your HVAC system and getting the most from it, contact We provide trusted HVAC services for homeowners in Chicagoland, southwestern Michigan and northwestern Indiana.

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