What Are the Parts of an HVAC system?

Quality HVAC parts installation

An HVAC system has a big job in your home. It cools and heats, and with proper maintenance, regular check-ups, and a good quality system, you shouldn’t ever be uncomfortable in your home. Except, how much do you know about the HVAC system in your home? We will take a deeper look at HVAC systems, the HVAC parts within the system, and how it all works to keep you comfortable in the middle of summer or on a cold winter’s day.

How do HVAC systems work?

There are different cooling and heating distribution systems, which we will review here: 

  • A Forced Air System – With a blower, this system forces cold or hot air through metal ducts, one duct for cold, one duct for hot. Which one is being blown through depends on whether you have the system set for air conditioning or heat at the thermostat. The most frequent problem with this type of system is the blower, one of the many HVAC parts. They fail or totally quit. 
  • A Gravity System – This system is installed in the basement and operates on the principle of gravity, whereas cold airdrops and hot air soars. When the unit is turned on, the warm air rises into your home to heat it, and when it is turned off, the air cools and sinks to the basement where it reheats when the system is turned on again. You can use an air conditioning system with a gravity system. 
  • A Radiant System – A radiant system transports water through pipes in the ceiling, floors, and walls and heats them. Like the Gravity System, you cannot use an air conditioning system with this one either. A common issue with this type of system is the water transportation is prone to fail because of minerals in the water will wear the pipes out, much like the plumbing in your home, and is the some of the HVAC parts of the system.    

What is the principle of HVAC?

HVAC is the acronym for Heating, Ventilation, and Air Conditioning. You will see it as HVACR which is the addition of refrigeration. Basically, HVAC is control of the climate in a confined space with respect to the settings of the thermostat. An HVAC system is more than just cooling or heating that confined space. It has another job to maintain the IAQ, better known as indoor air quality.  There are many HVAC parts that react to the commands of the thermostat if the cold air or heated air is needed.

What are the parts of an HVAC system?

It is easier to maintain your HVAC system when you understand how it works and the HVAC parts that make it work. This knowledge will also assist you in doing some of the work yourself instead of calling an HVAC contractor.  Here, we have listed the main HVAC parts and their purpose: 

The Heat Exchanger 

This is the housing of the furnace which absorbs heat then warms the cool air when activated by the thermostat, causing combustion that makes the heat rise. It is an important component made of temperature-resistant stainless steel with alloys that prevent it from cracking. 

Of all the HVAC parts, if this one has any problems, it can create carbon monoxide, a colorless & odorless substance. This leads to headaches, nausea, or death. HVAC contractors and experts recommend having a carbon monoxide detector in each bedroom and the kitchen. It is important to have your HVAC system checked and inspected annually by an experienced HVAC contractor. 

The Blower Motor

This is the one part of the HVAC parts that you’ll feel the air from. Once the air in the heat exchanger achieves the preset temperature, the blower starts and forces that warmed air through the ductwork, air registers, and into to each room. The combustion mentioned earlier stops prior to the fan stopping, allowing the warmed air in the heat exchanger and the ductwork to reach all the rooms. 

The Combustion Chamber

For proper combustion, oxygen is a must and comes from the furnace. The combustion chamber is referred to as the burner. With a gas-powered furnace, the heating cycle begins when a small quantity of mixed air and gas enters the chamber. At that point, another of the man HVAC parts is a glow stick or pilot light will ignite the mixture, creating a controlled fire as more air & gas enter the burner. 

The Compressor

The compressor is one of the HVAC parts that works the air conditioner and is the unit installed on the exterior of your home. It releases the heat it pulls from inside the house back outside, then compresses and condenses the refrigerant inside the unit to a cold liquid.

Simultaneously, a fan is blowing air over the compressor to scatter the heat or cool the refrigerant quicker. The HVAC system then sends the liquid refrigerant through a line (either aluminum or copper) to the evaporator coil.

The Evaporator Coil

The evaporator coil is another important part of the HVAC parts for the air conditioner inside the indoor air handler. The HVAC system pulls refrigerant to a succession of expansion valves that sprays the liquid refrigerant, allowing the gas to evaporate into a gas. The heat is then absorbed and the temperature in the lowers. 

The Thermostat

There are sensors that let the thermostat know when the air conditioner or heater needs to turn on or off. It is directly connected to the HVAC system by special wires. The thermostat is one of the easiest HVAC parts to replace and homeowners with an older home will often replace the thermostat with a programmable unit. Depending on where you live, one of the common locations where to buy HVAC parts locally is the big box stores like Home Depot, or Grainger, and major manufacturers like Lennox, Trane. 

So, you may be asking, “Who sells HVAC parts?”. HVAC parts and service centers will often have HVAC parts for sale as well as providing service. Simply ask “Can I buy HVAC parts as a homeowner?” and if they can, they usually will. There are some items like refrigerant that may require them to sell only to a licensed HVAC technician.    

Does central air use gas?

Central air conditioners are electrical, while the central heat can be electric, gas, or oil. Anything a homeowner can do correctly and safely for repairs around the home can save you money. However, if you make any error, or get a project started and can’t finish it, the repair could cost you more than it would have to have called an HVAC contractor. It is the same as with your car’s transmission – sometimes, there are things that should only be done by experienced contractors. For all of your HVAC parts needs in Vacaville, CA, call 707-689-5128 for A 100% Guarantee Heating and AC today!