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Do You Know The 7 Components Crucial For Air Conditioner Function? 

Aug 5, 2022 | A/C, Air Conditioner, Air Filter, Blog, Cincinnati, Cooling, Five Star, HVAC, OH, Ohio, Thermostat, Tip & Tricks

Suppose you have a modern, top-of-the-line high-efficiency air conditioning unit; it functions perfectly, has reduced your energy bill, and most importantly, provides a cool environment for you and your family to dwell in. But just what exactly is it that each component of your cooling system does? Are you familiar with how many components there are and the purpose of each crucial part? We believe that even if you’re not a technician, homeowners should understand how their A/C unit functions and the parts it is comprised of. That way, you won’t be surprised and overwhelmed if you stay informed and prepared. Naturally, we don’t hope that this happens, and if it does, Five Star Heating & Cooling Cincinnati is available 24/7, 365 days a week to come running to your aid. But learning about the 7 Components crucial for air conditioner function may just prove useful to you down the road. So, by all means, please keep reading! 

Evaporator Coil

This piece is typically located inside of the air handler. Cooling refrigerant is designed to flow through your A/C system. It is cooled down to a lower temperature right before the evaporator coil. Then, during the time warm air in your home is brought into your AC, it is directed over the evaporator coil, which accordingly takes the warm air and reduces its temperature by swiftly cooling off. 

Air Filter

The cool air your A/C system pushes out is filtered before it is distributed throughout your home. This is a vital step that is often not given much thought to. Air filters are set up so that the cool air has to pass through them to guarantee airborne particles and pollutants are properly filtrated. This A/C component is an essential component of your system as it affects the well-being and health of everyone in your household.  

Blower Fan

The blower fan is placed inside your air handler, where it blows cool air over the evaporator coil to keep the temperature lower. After temperatures are reduced, the cooled air is then blown and evenly distributed to your air ducts and circulated throughout your house.  

Expansion Valve

Next up, let’s address the expansion valve. It is positioned right between the evaporator and condenser. So when the refrigerant changes to liquid form, it can no longer enforce heat absorption. To fix this, when the refrigerant reaches the expansion valve, this is where it expands into a gaseous substance. This is completed by the refrigerant coming into contact with a drop of pressure drop in this valve which causes it to quickly cool down. After this whole process, the gaseous, cooled refrigerant resumes its trek into the evaporator coils, where the entire A/C process is repeated. 


It’s just as it sounds. The compressor does just that – compresses! Before the refrigerant arrives at the compressor, it is still in vapor form. So, when the refrigerant arrives at this part of the A/C system, it is compressed to a hot liquid form.  

Condenser Coil

The purpose of the condenser coil is to extract the heat from the refrigerant and release it outside of the home. So if you think about it, it does the exact opposite of the evaporator coil. The condenser coil is located in the outdoor unit.  


Thermostats are hands-down the most commonly recognized air conditioning component amongst homeowners. They are installed on a wall inside your house and are the piece of the system used to control your HVAC system and all its settings.  

Your home’s residential air conditioning system is constructed of seven different components that each have their job, so it all works together in perfect harmony. Each piece has its designated purpose, so your A/C system would not work adequately if one of the components were to malfunction. We hope this has been informative to you and will provide you with ease of mind as you continue using your A/C this season! Keep in mind, if anything comes up with your system, or if you just have a question or concern – whatever your need is, we are here to assist you! You can reach your Five Star Heating & Cooling Cincinnati service professionals at (513) 216-5011, or schedule an appointment online now by clicking here!