April 6, 2021
Man working on air conditioner

Since air conditioners were invented in 1902, many have come to regard them as a necessity. It’s helpful to have a basic understanding of your air conditioner’s critical parts so you’re more informed when something goes wrong.

Evaporator Coil

In the evaporator coil, the refrigerant turns into a gas. The refrigerant extracts heat and humidity from the air in your home. The refrigerant then flows to the compressor.


The compressor pressurizes the gas, which heats it even more. The reason this needs to happen is that the refrigerant needs to be hotter than the air outside your home, so it can be released. Warm air flows to cooler air.

Condensing Coil

The condensing coil is the large outdoor air conditioner unit on your property. Between the compressor and condensing coils, the refrigerant expels heat outdoors. The refrigerant cools to a liquid and then goes back to the evaporator coil to start the process again.


The blower circulates air in your home. Cool air is blown into your home while room-temperature air is pulled in so it can be cooled.


The outdoor condensing unit has a large fan inside it. The fan pulls heat from the condensing coils, so they don’t overheat.


Your air conditioner has a filter that prevents dust and dirt from collecting on its parts. Dust and dirt make your air conditioner less efficient and your indoor air quality worse. Depending on whether your air conditioner has a disposable or reusable filter, replace or clean it every few months.


Your thermostat controls the air conditioning process. By measuring the room temperature in your home, it tells the air conditioner when to turn on and off.

Unitedly Service Group in Rochester, MN, can help you with your air conditioner. We install, repair, and maintain heaters and air conditioners. We can also help you with indoor air quality, water heaters, zone controls, in-floor heating systems, backflow testing, exhaust systems, and more. Please call today to find out more.

company icon