For most homeowners, all they need to know is that their air conditioner is working and keeping their home cool. But when something isn’t working right and you come home to a warm house, understanding how the system works and what parts perform which function, diagnosing an issue and explaining what is happening to an air conditioning repair tech is much easier.

The team at Modern Services isn’t expecting you to diagnose every problem with your air conditioner, but the more information you can provide us, the faster we can find a solution and get your home back to a comfortable temperature.

Air conditioning units are made up of many mechanical and electrical parts that all work together to create cool air that is then blown throughout your home. Among the many parts, there are a few essential components that will help you understand the entire system. Here are the most important parts of your AC unit that, when they aren’t functioning properly, will mean that you may need air conditioning repair services.


Also used in your car’s air conditioning, this is a fluid that plays a vital role in the cycle of heating and cooling air. Refrigerant is constantly changing from a liquid to a gas and back to a liquid as it pulls warm air from inside the home and releases it outside. Refrigerant runs through a series of tubes and copper coils, interacting with both the compressor and condenser coil.


Possibly the two most important parts in the air conditioning system are the compressor and the condenser coil. The compressor pressurizes the refrigerant and squeezes it together, which increases its temperature. The refrigerant needs to be hotter than the temperature outside (because heat moves from hot to cold), allowing it to flow outside and release the heat.

In the hot and humid Florida climate, the compressor, powered by a motor, works incredibly hard and as dust and grime build up, it can eventually become stuck. When the compressor stops working, the cooling cycle doesn’t occur. The compressor can also develop leaks, which causes refrigerant to leak, resulting in damage to the compressor.

Condenser Coil

The condenser coil receives the hot refrigerant from the compressor and helps the heat transfer into the air. At this point, the refrigerant turns back into a liquid and flows to the expansion valve. This part of the system could also become dirty as the entire system operates, reducing the efficiency of the coils.

Expansion Valve

Before the refrigerant is ready to enter the evaporator coil, it needs to be cooled down, even after it has released heat into the air outside. The expansion valve depressurizes the refrigerant, also decreasing the temperature.

Evaporator Coil

This part can be a little confusing, but essentially there is a series of coils that help to cool the air before being blown through your home. The coils sit inside a metal covering so it’s rare that a homeowner will ever see them. To cool the air, liquid refrigerant moves through the coils. When warm air from the outside flows over the cold coils, the refrigerant absorbs the heat from the air, resulting in cool air that is pushed through your home.

There are several reasons why the evaporator coils may not be working as they should:

  • There is a refrigerant leak
  • Low airflow could cause the coils to freeze
  • The coils could be dirty, preventing the refrigerant from absorbing the heat.

Overall, the entire process involves moving the refrigerant through a system that picks up warm air inside the home and releases it outside. However, this process can become complicated when getting into the details of high-pressure gas, increasing and decreasing refrigerant temperatures, and all of the moving parts.

At Modern Services, our air conditioning technicians have been working in this industry for decades and we thoroughly understand the process and what could go wrong at each point along the line. We also have the knowledge, experience, and required tools to quickly and efficiently repair any problems. If you’re in need of air conditioning repair, get in touch with our team today. We provide service through the West Florida region and we’re happy to help make sure you have a comfortable home.