How does an Air Conditioner work?

How Does an Air Conditioner Work?

An air conditioner cools your home by moving heat from inside to outside, not by creating cold air directly. It does this using refrigerant, a chemical compound that absorbs and releases heat as it cycles between liquid and gas states inside the system's coils, over and over, for as long as the system runs.

The Basic Cycle

The process happens continuously while the system is running:

• Indoor air passes over the evaporator coil, where refrigerant absorbs heat and humidity from that air
• The now-cooled air is pushed back through your ductwork by the blower fan
• The heat-carrying refrigerant travels to the outdoor unit, where the compressor pressurizes it
• The condenser coil releases that absorbed heat to the outside air
• The refrigerant cools back down and returns indoors to repeat the cycle

Why Humidity Removal Matters

As indoor air passes over the cold evaporator coil, moisture in the air condenses on the coil and drains away — which is why a properly running air conditioner also lowers indoor humidity, not just temperature. This is part of why an oversized system can actually feel less comfortable despite cooling the air quickly: it shuts off before it has removed enough humidity, leaving the air cold but clammy.

What Keeps the Cycle Running Smoothly

This cycle depends on a sealed refrigerant charge, clean coils, and unrestricted airflow — a leak, a dirty coil, or a clogged filter can all quietly reduce how much heat the system is able to move, even before the thermostat shows a noticeable difference.

LJ Refrigeration Co. services and installs the coils, refrigerant lines, and components that make this cycle work efficiently, year after year.